U.S. patent application number 16/586401 was filed with the patent office on 2020-03-26 for synthetic route to anti-viral agents.
The applicant listed for this patent is AbbVie Inc.. Invention is credited to Michael J. Abrahamson, Richard D. Bishop, Russell D. Cink, Kenneth M. Engstrom, David R. Hill, Jeff M. Kallemeyn, Marvin R. Leanna, Kirill A. Lukin, Jianzhang Mei, Westin H. Morrill, Matthew J. Pelc, Matthew M. Ravn, Timothy B. Towne, Dennie S. Welch, Gang Zhao.
Application Number | 20200095230 16/586401 |
Document ID | / |
Family ID | 60189659 |
Filed Date | 2020-03-26 |
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United States Patent
Application |
20200095230 |
Kind Code |
A1 |
Cink; Russell D. ; et
al. |
March 26, 2020 |
SYNTHETIC ROUTE TO ANTI-VIRAL AGENTS
Abstract
The invention provides methods of synthesizing a viral protease
inhibitor in high yield, without using expensive catalysts or
challenging reaction conditions.
Inventors: |
Cink; Russell D.;
(Grayslake, IL) ; Lukin; Kirill A.; (Vernon Hills,
IL) ; Leanna; Marvin R.; (Grayslake, IL) ;
Pelc; Matthew J.; (Pleasant Prairie, WI) ; Towne;
Timothy B.; (Lindenhurst, IL) ; Welch; Dennie S.;
(Gurnee, IL) ; Engstrom; Kenneth M.; (Mundelein,
IL) ; Ravn; Matthew M.; (Round Lake Beach, IL)
; Bishop; Richard D.; (Third Lake, IL) ; Zhao;
Gang; (Northbrook, IL) ; Mei; Jianzhang; (Lake
Forest, IL) ; Kallemeyn; Jeff M.; (Libertyville,
IL) ; Hill; David R.; (Gurnee, IL) ;
Abrahamson; Michael J.; (Chicago, IL) ; Morrill;
Westin H.; (Grayslake, IL) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
AbbVie Inc. |
North Chicago |
IL |
US |
|
|
Family ID: |
60189659 |
Appl. No.: |
16/586401 |
Filed: |
September 27, 2019 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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16132997 |
Sep 17, 2018 |
10442792 |
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16586401 |
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15804485 |
Nov 6, 2017 |
10077256 |
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16132997 |
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14802372 |
Jul 17, 2015 |
9809576 |
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15804485 |
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62026412 |
Jul 18, 2014 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
C07C 67/08 20130101;
C07C 69/96 20130101; C07C 69/14 20130101; C07C 271/34 20130101;
C07C 269/04 20130101; C07C 271/34 20130101; C07C 2601/08 20170501;
C07C 271/34 20130101; C07C 41/26 20130101; C07C 269/04 20130101;
C07C 43/196 20130101; C07C 269/06 20130101; C07C 68/02 20130101;
C07C 68/02 20130101; C07C 211/35 20130101; C12P 1/00 20130101; C07D
405/06 20130101; C07D 241/44 20130101; C12P 41/005 20130101; C07D
405/14 20130101; C07C 67/08 20130101; C07C 69/74 20130101; C07D
403/12 20130101; C07D 487/04 20130101; C07C 269/06 20130101 |
International
Class: |
C07D 403/12 20060101
C07D403/12; C07D 405/14 20060101 C07D405/14; C07D 241/44 20060101
C07D241/44; C07D 405/06 20060101 C07D405/06; C07C 271/34 20060101
C07C271/34; C07C 69/74 20060101 C07C069/74; C07C 43/196 20060101
C07C043/196; C07D 487/04 20060101 C07D487/04; C07C 269/06 20060101
C07C269/06; C07C 269/04 20060101 C07C269/04; C07C 41/26 20060101
C07C041/26; C07C 67/08 20060101 C07C067/08; C07C 68/02 20060101
C07C068/02; C07C 211/35 20060101 C07C211/35; C12P 1/00 20060101
C12P001/00; C12P 41/00 20060101 C12P041/00 |
Claims
1-18. (canceled)
19. A method, comprising the reaction shown in Scheme B:
##STR00210## wherein the reaction takes place in a solvent, thereby
forming a product mixture comprising ##STR00211##
20. The method of claim 19, wherein the solvent comprises toluene,
dichloromethane, THF, acetone, heptane, hexane, methyl tert-butyl
ether, ethyl acetate, dioxane, DMF, DMA, acetonitrile, or DMSO, or
a mixture thereof.
21. The method of claim 20, wherein the solvent comprises toluene,
acetonitrile, or dichloromethane or a mixture thereof.
22. The method of claim 19, wherein the reaction of scheme B takes
place at a temperature from about -20.degree. C. to about
10.degree. C.
23. The method of claim 22, wherein the temperature is about
-20.degree. C., about -15.degree. C., about -10.degree. C., about
-5.degree. C., about 0.degree. C., about 5.degree. C., or about
10.degree. C.
24. The method of claim 22, wherein the temperature is about
-10.degree. C. to about 10.degree. C.
25. The method of claim 22, wherein the temperature is about
0.degree. C.
26. The method of claim 19, further comprising: isolating
##STR00212## from the product mixture, thereby obtaining
substantially pure ##STR00213##
27. The method of claim 19, further comprising the reaction shown
in Scheme A: ##STR00214## wherein the reaction takes place in a
second solvent, thereby forming a second product mixture comprising
##STR00215##
28. The method of claim 26, further comprising the reaction shown
in Scheme A: ##STR00216## wherein the reaction takes place in a
third solvent, thereby forming a third product mixture comprising
##STR00217##
Description
RELATED APPLICATIONS
[0001] This application claims the benefit of priority to U.S.
Provisional Patent Application Ser. No. 62/026,412, filed Jul. 18,
2014, the contents of which are hereby incorporated by
reference.
BACKGROUND
[0002] Complex biologically active molecules are challenging,
expensive, and time-consuming to synthesize. Synthesizing chiral,
non-racemic compounds with good enantio- and diastereoselectivity
is even more challenging. An example of such a molecule is Compound
1:
##STR00001##
This compound is a potent inhibitor of the hepatitis C virus (HCV)
NS3/4A protease; it shows broad genotype activity and substantially
improved in vitro profile compared to earlier generation HCV NS3/4A
protease inhibitors.
[0003] The original synthesis of this compound requires a ring
closing metathesis (RCM) reaction for synthesis of the macrocycle
(see WO 2012/040167). However, this RCM reaction involves high
catalyst loading and expensive starting materials, resulting in low
throughput due to dilute reaction conditions and increased
costs.
[0004] There exists a need for new, efficient synthetic methods to
construct Compound 1.
SUMMARY OF THE INVENTION
[0005] In certain embodiments, the invention relates to a compound
selected from:
##STR00002##
or a salt thereof.
[0006] In certain embodiments, the invention relates to a compound
selected from:
##STR00003##
or a salt thereof.
[0007] In certain embodiments, the invention relates to a compound
selected from:
##STR00004##
or a salt thereof.
[0008] In certain embodiments, the invention relates to a compound
selected from:
##STR00005##
or a salt thereof.
[0009] In certain embodiments, the invention relates to a compound
selected from:
##STR00006##
or a salt thereof.
[0010] In certain embodiments, the invention relates to a compound
selected from:
##STR00007##
[0011] In certain embodiments, the invention relates to a method
according to reaction scheme A:
##STR00008##
wherein the reaction takes place in a sixteenth solvent, thereby
forming a thirteenth product mixture comprising
##STR00009##
[0012] In certain embodiments, the invention relates to a method
according to reaction scheme B:
##STR00010##
wherein the reaction takes place in a fifteenth solvent, thereby
forming a twelfth product mixture comprising
##STR00011##
[0013] In certain embodiments, the invention relates to a method
according to reaction scheme C:
##STR00012##
wherein Step 1 of the reaction takes place in a thirteenth solvent
in the presence of a seventh base; and Step 2 of the reaction takes
place in a fourteenth solvent, thereby forming an eleventh product
mixture comprising
##STR00013##
[0014] In certain embodiments, the invention relates to a method
according to reaction scheme D:
##STR00014##
wherein the reaction takes place in a twelfth solvent in the
presence of a second acid, thereby forming a tenth product mixture
comprising
##STR00015##
[0015] In certain embodiments, the invention relates to a method
according to reaction scheme E:
##STR00016##
wherein the reaction takes place in an eleventh solvent in the
presence of a sixth base, thereby forming a ninth product mixture
comprising
##STR00017##
[0016] In certain embodiments, the invention relates to a method
according to reaction scheme E':
##STR00018##
wherein step (1) takes place in a nineteenth solvent in the
presence of an eighth base, and step (2) takes place in a twentieth
solvent in the presence of a ninth base, thereby forming a
sixteenth product mixture comprising
##STR00019##
[0017] In certain embodiments, the invention relates to a method
according to reaction scheme F:
##STR00020##
wherein the reaction takes place in a tenth solvent in the presence
of a fifth base, thereby forming an eighth product mixture
comprising
##STR00021##
[0018] In certain embodiments, the invention relates to a method
according to reaction scheme F':
##STR00022##
wherein the reaction takes place in a eighteenth solvent in the
presence of a reagent, thereby forming an fifteenth product mixture
comprising
##STR00023##
[0019] In certain embodiments, the invention relates to a method
according to reaction scheme G:
##STR00024##
wherein the reaction takes place in a ninth solvent in the presence
of a fourth base, thereby forming a seventh product mixture
comprising
##STR00025##
[0020] In certain embodiments, the invention relates to a method
according to reaction scheme G':
##STR00026##
wherein the reaction takes place in a seventeenth solvent in the
presence of an oxidant, thereby forming a fourteenth product
mixture comprising
##STR00027##
[0021] In certain embodiments, the invention relates to a method
according to reaction scheme H:
##STR00028##
wherein the reaction takes place in an eighth solvent, thereby
forming a sixth product mixture comprising
##STR00029##
[0022] In certain embodiments, the invention relates to a method
according to reaction scheme I:
##STR00030##
wherein Step 1 of the reaction takes place in a sixth solvent at a
sixth temperature to effect a Claisen rearrangement, and Step 2 of
the reaction takes place in a seventh solvent at a seventh
temperature, thereby forming a fifth product mixture comprising
##STR00031##
[0023] In certain embodiments, the invention relates to a method
according to reaction scheme J:
##STR00032##
wherein the reaction takes place in a fifth solvent in the presence
of a first acid and a hydrogen source, thereby forming a fourth
product mixture comprising
##STR00033##
[0024] In certain embodiments, the invention relates to a method
according to reaction scheme K:
##STR00034##
wherein Step 1 of the reaction takes place in a third solvent in
the presence of a second base; and Step 2 of the reaction takes
place in a fourth solvent in the presence of a third base, thereby
forming a third product mixture comprising
##STR00035##
[0025] In certain embodiments, the invention relates to a method
according to reaction scheme L:
##STR00036##
wherein the reaction takes place in a second solvent in the
presence of a first enzyme, thereby forming a second product
mixture comprising
##STR00037##
[0026] In certain embodiments, the invention relates to a method
according to reaction scheme M:
##STR00038##
wherein the reaction takes place in a first solvent in the presence
of a first base, thereby forming a first product mixture
comprising
##STR00039##
DETAILED DESCRIPTION OF THE INVENTION
I. Overview
[0027] In certain embodiments, the invention involves a method of
synthesizing the macrocycle of Compound 1 based on an
intramolecular etherification reaction to form compound 3 (see
Scheme 1). In certain embodiments, the synthesis of 1 via compound
3 eliminates the need for expensive catalysts required in
ring-closing metathesis reactions. In certain embodiments, the
synthesis of 1 via compound 3 uses low-cost starting materials. In
certain embodiments, the synthesis of 1 via compound 3 results in
an overall high throughput.
[0028] In certain embodiments, the etherification route for the
synthesis of 1, shown in Scheme 1, utilizes an intramolecular
etherification reaction as the key step in the synthesis of the
macrocycle 3. The synthesis of 1 may begin with the peptide
coupling of amine 69 with carboxylic acid 70 wherein protection of
the allylic alcohol in 69 may be accomplished in-situ with the
trimethylsilyl (TMS) (or triethysilyl (TES), or similar) protecting
group. The allylic alcohol of coupling product 71 may be activated
by conversion to the allylic bromide 72, although alternate leaving
groups can also be employed (for example, Cl, I, TsO, TfO, MsO,
etc. instead of Br). The allylic bromide 72 may undergo
intramolecular etherification and saponification to form the
macrocycle acid 3. The coupling partner for the macrocycle may be
the amine 4, which may be synthesized by coupling acid 54 with
sulfonamide 55 to yield 56 which may be subjected to
tert-butyloxycarbonyl (Boc) deprotection. The macrocycle acid 3 may
be then coupled to amine 4 to yield 1. In certain embodiments, the
synthesis of 1 is based on the construction of three key structural
fragments of the molecule, in particular compounds 54, 69, and
70.
##STR00040##
[0029] In certain embodiments, the invention relates to a method of
synthesizing compound 23 (see Scheme 4).
II. Definitions
[0030] Listed below are definitions of various terms used to
describe this invention. These definitions apply to the terms as
they are used throughout this specification and claims, unless
otherwise limited in specific instances, either individually or as
part of a larger group. The number of carbon atoms in a hydrocarbyl
substituent can be indicated by the prefix "C.sub.x-C.sub.y," where
x is the minimum and y is the maximum number of carbon atoms in the
substituent.
[0031] The term "alkyl" as used herein, refers to a saturated,
straight- or branched-chain hydrocarbon radical typically
containing from 1 to 20 carbon atoms. For example, "C.sub.1-C.sub.6
alkyl" or "C.sub.1-C.sub.8 alkyl" contains from one to six, or from
one to eight, carbon atoms, respectively. Examples of alkyl
radicals include, but are not limited to, methyl, ethyl, propyl,
isopropyl, n-butyl, tert-butyl, neopentyl, n-hexyl, heptyl, octyl
radicals and the like.
[0032] The term "cycloalkyl" denotes a monovalent group derived
from a monocyclic or polycyclic saturated carbocyclic ring
compound. Examples of cycloalkyl include, but are not limited to,
cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl,
bicyclo[2.2.1]heptyl, and bicyclo[2.2.2]octyl and the like.
[0033] The term "amino-protecting group," as used herein, refers to
a labile chemical moiety that can protect an amino group against
undesired reactions during synthetic procedures. After said
synthetic procedure(s) the amino-protecting group as described
herein may be selectively removed. Suitable amino-protecting groups
are described generally in T. H. Greene and P. G. M. Wuts,
Protective Groups in Organic Synthesis, 3rd edition, John Wiley
& Sons, New York (1999). Examples of amino-protecting groups
include, but are not limited to, t-butoxycarbonyl,
9-fluorenylmethoxycarbonyl, benzyloxycarbonyl, and the like.
[0034] The term "protected amino," as used herein, refers to an
amino group protected with an amino-protecting group as defined
above.
[0035] As used herein, the term "salt" preferably refers to
"pharmaceutically acceptable salts," which are, within the scope of
sound medical judgment, suitable for use in contact with the
tissues of humans and other vertebrates, preferably mammals,
without undue toxicity, irritation, allergic response and the like,
and are commensurate with a reasonable benefit/risk ratio.
Pharmaceutically acceptable salts are well known in the art. For
example, S. M. Berge, et al. describe pharmaceutically acceptable
salts in detail in J. Pharmaceutical Sciences, 66: 1-19 (1977).
Such salts can be prepared in situ during isolation and
purification of reaction products as described herein, or
separately, such as by reacting a free base function with a
suitable acid, such as an organic acid. Examples of
pharmaceutically acceptable salts include, but are not limited to,
hydrochloride, hydrobromide, phosphate, sulfate, perchlorate,
acetate, maleate, tartrate, citrate, succinate, or malonate. Other
pharmaceutically acceptable salts include, but are not limited to,
adipate, alginate, ascorbate, aspartate, benzenesulfonate,
benzoate, bisulfate, borate, butyrate, camphorate,
camphorsulfonate, cyclopentanepropionate, digluconate,
dodecylsulfate, ethanesulfonate, formate, fumarate, glucoheptonate,
glycerophosphate, gluconate, hemisulfate, heptanoate, hexanoate,
hydroiodide, 2-hydroxy-ethanesulfonate, lactobionate, lactate,
laurate, lauryl sulfate, malate, methanesulfonate,
2-naphthalenesulfonate, nicotinate, nitrate, oleate, oxalate,
palmitate, pamoate, pectinate, persulfate, 3-phenylpropionate,
phosphate, picrate, pivalate, propionate, stearate, sulfate,
thiocyanate, p-toluenesulfonate, undecanoate, valerate salts, and
the like. Representative alkali or alkaline earth metal salts
include sodium, lithium, potassium, calcium, or magnesium salts,
and the like. Further pharmaceutically acceptable salts include,
when appropriate, ammonium, quaternary ammonium, and amine cations
associated with counterions such as halide, hydroxide, carboxylate,
sulfate, phosphate, nitrate, C.sub.1-6 alkyl sulfonate and aryl
sulfonate.
[0036] As used herein, the term "enantioenriched" means a mixture
of enantiomers in which one of the two enantiomers is present in a
larger amount. This term also encompasses an enantiomerically pure
compounds (i.e., a compound having an enantiomeric excess (ee)
greater than about 90%, greater than about 95%, preferably greater
than about 98%, most preferably greater than about 99%).
[0037] Various aspects of the invention are described in further
detail herein.
III. Exemplary Compounds
[0038] In certain embodiments, the invention relates to a compound
selected from:
##STR00041##
or a salt thereof.
[0039] In certain embodiments, the invention relates to any one of
the compounds described herein, wherein the compound is
##STR00042##
or a salt thereof.
[0040] In certain embodiments, the invention relates to any one of
the compounds described herein, wherein the compound is
##STR00043##
or a salt thereof.
[0041] In certain embodiments, the invention relates to a compound
selected from:
##STR00044##
or a salt thereof.
[0042] In certain embodiments, the invention relates to any one of
the compounds described herein, wherein the compound is
##STR00045##
or a salt thereof.
[0043] In certain embodiments, the invention relates to any one of
the compounds described herein, wherein the compound is
##STR00046##
or a salt thereof.
[0044] In certain embodiments, the invention relates to any one of
the compounds described herein, wherein the compound is
##STR00047##
or a salt thereof.
[0045] In certain embodiments, the invention relates to any one of
the compounds described herein, wherein the compound is
##STR00048##
or a salt thereof.
[0046] In certain embodiments, the invention relates to any one of
the compounds described herein, wherein the compound is
##STR00049##
In certain embodiments, the invention relates to any one of the
compounds described herein, wherein the compound is
##STR00050##
in crystalline form.
[0047] In certain embodiments, the invention relates to any one of
the compounds described herein, wherein the compound is
##STR00051##
In certain embodiments, the invention relates to any one of the
compounds described herein, wherein the compound is
##STR00052##
in crystalline form.
[0048] In certain embodiments, the invention relates to a compound
selected from:
##STR00053##
or a salt thereof.
[0049] In certain embodiments, the invention relates to any one of
the compounds described herein, wherein the compound is
##STR00054##
or a salt thereof. In certain embodiments, the invention relates to
any one of the compounds described herein, wherein the compound
is
##STR00055##
in crystalline form.
[0050] In certain embodiments, the invention relates to any one of
the compounds described herein, wherein the compound is
##STR00056##
or a salt thereof. In certain embodiments, the invention relates to
any one of the compounds described herein, wherein the compound
is
##STR00057##
in crystalline form.
[0051] In certain embodiments, the invention relates to a compound
selected from:
##STR00058##
or a salt thereof.
[0052] In certain embodiments, the invention relates to any one of
the compounds described herein, wherein the compound is
##STR00059##
or a salt thereof. In certain embodiments, the invention relates to
any one of the compounds described herein, wherein the compound
is
##STR00060##
in crystalline form.
[0053] In certain embodiments, the invention relates to any one of
the compounds described herein, wherein the compound is
##STR00061##
or a salt thereof. In certain embodiments, the invention relates to
any one of the compounds described herein, wherein the compound
is
##STR00062##
in crystalline form.
[0054] In certain embodiments, the invention relates to any one of
the compounds described herein, wherein the compound is
##STR00063##
or a salt thereof. In certain embodiments, the invention relates to
any one of the compounds described herein, wherein the compound
is
##STR00064##
or a salt thereof, in crystalline form.
[0055] In certain embodiments, the invention relates to any one of
the compounds described herein, wherein the compound is
##STR00065##
In certain embodiments, the invention relates to any one of the
compounds described herein, wherein the compound is
##STR00066##
in crystalline form.
[0056] In certain embodiments, the invention relates to a compound
selected from:
##STR00067##
or a salt thereof.
[0057] In certain embodiments, the invention relates to any one of
the compounds described herein, wherein the compound is
##STR00068##
or a salt thereof.
[0058] In certain embodiments the invention related to any one of
the compounds described herein, wherein the compound is
##STR00069##
or a salt thereof.
[0059] In certain embodiments, the invention relates to any one of
the compounds described herein, wherein the compound is
##STR00070##
In certain embodiments, the invention relates to any one of the
compounds described herein, wherein the compound is
##STR00071##
in crystalline form.
[0060] In certain embodiments, the invention relates to any one of
the compounds described herein, wherein the compound is
##STR00072##
In certain embodiments, the invention relates to any one of the
compounds described herein, wherein the compound is
##STR00073##
in crystalline form.
[0061] In certain embodiments, the invention relates to a compound
selected from:
##STR00074##
[0062] In certain embodiments, the invention relates to any one of
the compounds described herein, wherein the compound is
##STR00075##
[0063] In certain embodiments, the invention relates to any one of
the compounds described herein, wherein the compound is
##STR00076##
[0064] In certain embodiments, the invention relates to any one of
the compounds described herein, wherein the compound is
##STR00077##
IV. Exemplary Methods and Uses
[0065] The compounds and processes of the present invention will be
better understood in connection with the following illustrative
methods by which the compounds of the invention may be prepared. It
will be understood that any of the reactions described herein, in
any of its variations, can be combined with one or more of the
other reactions, in any of their respective variations,
substantially in analogy with Scheme 1 above.
[0066] In certain embodiments, the invention relates to a method
according to reaction scheme A:
##STR00078##
wherein the reaction takes place in a sixteenth solvent, thereby
forming a thirteenth product mixture comprising
##STR00079##
[0067] In certain such embodiments, the quaternary ammonium
hydroxide can be replaced with a different base, such as LiOH,
NaOH, KOH, or another quaternary ammonium hydroxide, or a mixture
thereof.
[0068] In certain such embodiments, the quaternary ammonium
hydroxide can be replaced with another organic-soluble base, such
as another quaternary ammonium hydroxide.
[0069] In certain embodiments, the invention relates to any one of
the methods described herein including the reaction of scheme A,
wherein the sixteenth solvent comprises dimethylacetamide (DMA),
toluene, xylenes, THF, H.sub.2O, dimethylformamide (DMF), methyl
tert-butyl ether, ethyl acetate, dioxane, acetonitrile, or DMSO, or
a mixture thereof, preferably THF or H.sub.2O or a mixture thereof,
or acetonitrile or H.sub.2O or a mixture thereof.
[0070] In certain embodiments, the invention relates to any one of
the methods described herein including the reaction of scheme A,
wherein the reaction of scheme A takes place at a sixteenth
temperature, such as wherein the sixteenth temperature is from
about -20.degree. C. to about 30.degree. C., or from about
-20.degree. C. to about 10.degree. C., for example about
-20.degree. C., about -15.degree. C., about -10.degree. C., about
-5.degree. C., about 0.degree. C., about 5.degree. C., about
10.degree. C., about 15.degree. C., about 20.degree. C., or about
25.degree. C., preferably from -5.degree. C. to 5.degree. C., most
preferably about 0.degree. C.
[0071] In certain embodiments, the invention relates to any one of
the methods described herein including the reaction of scheme A,
wherein the reaction of scheme A takes place over a ninth period of
time, such as wherein the ninth period of time is from about 1 h to
about 40 h, for example, about 1 h, about 5 h, about 10 h, about 15
h, about 20 h, about 25 h, about 30 h, about 35 h, or about 40 h,
preferably about 10 h to about 30 h, most preferably about 20
h.
[0072] In certain embodiments, the invention relates to any one of
the methods described herein that include the reaction of scheme A,
further comprising isolating
##STR00080##
or a salt thereof from the thirteenth product mixture, thereby
obtaining substantially pure
##STR00081##
or a salt thereof.
[0073] In certain embodiments, the invention relates to any one of
the methods described herein, further comprising
recrystallizing
##STR00082##
or a salt thereof, to obtain the compound in a crystalline
form.
[0074] In certain embodiments, the invention relates to a method
according to reaction scheme B:
##STR00083##
wherein the reaction takes place in a fifteenth solvent, thereby
forming a twelfth product mixture comprising
##STR00084##
[0075] In certain embodiments, the invention relates to any one of
the methods described herein including the reaction of scheme B,
wherein the fifteenth solvent comprises toluene, dichloromethane,
THF, acetone, heptane, hexane, methyl tert-butyl ether, ethyl
acetate, dioxane, DMF, DMA, acetonitrile, or DMSO, or a mixture
thereof, preferably toluene, acetonitrile, or dichloromethane or a
mixture thereof.
[0076] In certain embodiments, the invention relates to any one of
the methods described herein including the reaction of scheme B,
wherein the reaction of scheme B takes place at a fifteenth
temperature, such as from about -20.degree. C. to about 10.degree.
C., for example about -20.degree. C., about -15.degree. C., about
-10.degree. C., about -5.degree. C., about 0.degree. C., about
5.degree. C., or about 10.degree. C., preferably about -10.degree.
C. to about 10.degree. C., most preferably about 0.degree. C.
[0077] In certain embodiments, the invention relates to any one of
the methods described herein, further comprising isolating
##STR00085##
from the twelfth product mixture, thereby obtaining substantially
pure
##STR00086##
[0078] In certain embodiments, the invention relates to a method
according to reaction scheme C:
##STR00087##
wherein Step 1 of the reaction takes place in a thirteenth solvent
in the presence of a seventh base; and Step 2 of the reaction takes
place in a fourteenth solvent, thereby forming an eleventh product
mixture comprising
##STR00088##
[0079] In certain such embodiments, the TMSCl is replaced by
another silylating reagent, such as TESCl, TMSOTf, TMSBr, TMSI, or
any other suitable silylating reagent.
[0080] In certain such embodiments, the TMSCl is replaced by
another source of TMS, such as TMSOTf, TMSBr, TMSI, or any other
suitable trimethylsilylating reagent.
[0081] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme C, wherein
the thirteenth solvent is DMA, toluene, dichloromethane, THF,
acetone, heptane, methyl tert-butyl ether, ethyl acetate, dioxane,
DMF, acetonitrile, or
[0082] DMSO or a mixture thereof, preferably acetonitrile or
DMA.
[0083] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme C, wherein
the seventh base is N-methylmorpholine, triethylamine, Et.sub.2NH,
(iPr).sub.2EtN, or (iPr).sub.2NH or a mixture thereof, preferably
(iPr).sub.2EtN.
[0084] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme C, wherein
the seventh base is N-methylmorpholine, triethylamine, or
(iPr).sub.2EtN, preferably (iPr).sub.2EtN.
[0085] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme C, wherein
Step 1 of reaction scheme C takes place at a thirteenth
temperature, such as from about -10.degree. C. to about 20.degree.
C., for example about -10.degree. C., about -5.degree. C., about
0.degree. C., about 5.degree. C., about 10.degree. C., about
15.degree. C., or about 20.degree. C., preferably about -10.degree.
C. to about 10.degree. C., most preferably about 0.degree. C.
[0086] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme C, wherein
the fourteenth solvent is DMA, toluene, dichloromethane, THF,
acetone, heptane, methyl tert-butyl ether, ethyl acetate, dioxane,
DMF, acetonitrile, or DMSO or a mixture thereof, preferably
acetonitrile or DMA.
[0087] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme C, wherein
Step 2 of reaction scheme C takes place at a fourteenth
temperature, such as from about 0.degree. C. to about 40.degree.
C., for example, about 0.degree. C., about 5.degree. C., about
10.degree. C., about 15.degree. C., about 20.degree. C., about
25.degree. C., about 30.degree. C., about 35.degree. C., or about
40.degree. C., preferably about 10.degree. C. to about 30.degree.
C., most preferably about 20.degree. C.
[0088] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme C, wherein
Step 2 of the reaction takes place over an eighth period of time,
such as from about 1 h to about 40 h, for example, about 1 h, about
5 h, about 10 h, about 15 h, about 20 h, about 25 h, about 30 h,
about 35 h, or about 40 h, preferably about 15 h.
[0089] In certain embodiments, the invention relates to any one of
the methods described herein, further comprising isolating
##STR00089##
from the eleventh product mixture, thereby obtaining substantially
pure
##STR00090##
[0090] In certain embodiments, the invention relates to a method
according to reaction scheme D:
##STR00091##
wherein the reaction takes place in a twelfth solvent in the
presence of a second acid, thereby forming a tenth product mixture
comprising
##STR00092##
[0091] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme D, wherein
the twelfth solvent is dioxane, acetonitrile, cyclopentylmethyl
ether (CPME), methanol, ethanol, isopropanol, n-propanol, water,
formic acid, acetic acid, or n-butanol or a mixture thereof,
preferably methanol or CPME or a mixture thereof.
[0092] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme D, wherein
the second acid is HCl (e.g., HCl generated from thionyl chloride),
HBr, H.sub.2SO.sub.4, CH.sub.3SO.sub.3H, or CF.sub.3SO.sub.3H,
preferably HCl.
[0093] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme D, wherein
the reaction of scheme D takes place at a twelfth temperature, such
as from about 10.degree. C. to about 40.degree. C., for example,
about 10.degree. C., about 15.degree. C., about 20.degree. C.,
about 25.degree. C., about 30.degree. C., about 35.degree. C., or
about 40.degree. C., preferably from about 15.degree. C. to about
30.degree. C., most preferably about 23.degree. C.
[0094] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme D, wherein
the reaction of scheme D takes place over a seventh period of time,
such as from about 1 h to about 40 h, for example, about 1 h, about
5 h, about 10 h, about 15 h, about 20 h, about 25 h, about 30 h,
about 35 h, or about 40 h, preferably about 5 h to about 25 h, most
preferably about 15 h.
[0095] In certain embodiments, the invention relates to any one of
the methods described herein, further comprising contacting
##STR00093##
with an acid, thereby forming a salt, wherein preferably the acid
is TsOH or HCl.
[0096] In certain embodiments, the invention relates to a method
according to reaction scheme E:
##STR00094##
wherein the reaction takes place in an eleventh solvent in the
presence of a sixth base, thereby forming a ninth product mixture
comprising
##STR00095##
[0097] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme E, wherein
the eleventh solvent is toluene, DMA, THF, DMF, methyl tert-butyl
ether, ethyl acetate, dioxane, acetonitrile, or DMSO or a mixture
thereof, preferably THF or toluene.
[0098] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme E, wherein
the sixth base is LiOtBu, NaOtBu, KOtBu, potassium t-amylate,
LiHMDS, NaHMDS, KHMDS, or lithium diisopropylamide, preferably
LiHMDS.
[0099] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme E, wherein
the reaction of scheme E takes place at an eleventh temperature,
such as from about -20.degree. C. to about 20.degree. C. or from
about -10.degree. C. to about 20.degree. C., for example about
-10.degree. C., about -5.degree. C., about 0.degree. C., about
5.degree. C., about 10.degree. C., about 15.degree. C., or about
20.degree. C., preferably about -5.degree. C. to about 15.degree.
C., most preferably about 5.degree. C.
[0100] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme E, wherein
the reaction of scheme E takes place over a sixth period of time,
such as from about 1 h to about 40 h, for example, about 1 h, about
5 h, about 10 h, about 15 h, about 20 h, about 25 h, about 30 h,
about 35 h, or about 40 h, preferably about 1 h to about 30 h or
about 10 h to about 30 h, most preferably about 20 h.
[0101] In certain embodiments, the invention relates to any one of
the methods described herein, further comprising isolating
##STR00096##
from the ninth product mixture, thereby obtaining substantially
pure
##STR00097##
[0102] In certain embodiments, the invention relates to a method
according to reaction scheme E':
##STR00098##
wherein step (1) takes place in a nineteenth solvent in the
presence of an eighth base, and step (2) takes place in a twentieth
solvent in the presence of a ninth base, thereby forming a
sixteenth product mixture comprising
##STR00099##
[0103] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme E', wherein
the nineteenth solvent is DMA, THF, DMF, methyl tert-butyl ether,
ethyl acetate, dioxane, acetonitrile, or DMSO or a mixture thereof,
preferably THF.
[0104] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme E', wherein
the eighth base is LiOtBu, NaOtBu, KOtBu, potassium t-amylate,
LiHMDS, NaHMDS, KHMDS, or lithium diisopropylamide, preferably
NaHMDS.
[0105] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme E', wherein
the twentieth solvent is water DMA, THF, DMF, methyl tert-butyl
ether, ethyl acetate, dioxane, acetonitrile, or DMSO or a mixture
thereof, preferably THF or water or a mixture thereof.
[0106] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme E', wherein
the ninth base is NaOtBu, LiOtBu, KOtBu, NaOH, LiOH, KOH, NaH, LiH,
or KH, preferably KOtBu.
[0107] In certain embodiments, the invention relates to any one of
the methods described herein, further comprising contacting
##STR00100##
with a base, preferably an amine base such as benzhydrylamine,
thereby forming a salt.
[0108] In certain embodiments, the invention relates to any one of
the methods described herein, further comprising crystallizing
##STR00101##
or a salt thereof, to obtain the compound in a crystalline
form.
[0109] In certain embodiments, the invention relates to a method
according to reaction scheme F:
##STR00102##
wherein the reaction takes place in a tenth solvent in the presence
of a fifth base, thereby forming an eighth product mixture
comprising
##STR00103##
[0110] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme F, wherein
the tenth solvent comprises H.sub.2O, DMA, toluene,
dichloromethane, THF, acetone, heptane, methyl tert-butyl ether,
ethyl acetate, dioxane, DMF, acetonitrile, or DMSO, preferably
H.sub.2O, acetonitrile, or ethyl acetate, or a mixture thereof.
[0111] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme F, wherein
the fifth base is NaHCO.sub.3, NaHSO.sub.3, NaH.sub.2PO.sub.4,
KHCO.sub.3, KHSO.sub.3, KH.sub.2PO.sub.4, LiHCO.sub.3, LiHSO.sub.3,
LiH.sub.2PO.sub.4, or sodium acetate, preferably NaHCO.sub.3.
[0112] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme F, wherein
the reaction takes place at a tenth temperature; and the tenth
temperature is from about -10.degree. C. to about 20.degree. C.,
for example about -10.degree. C., about -5.degree. C., about
0.degree. C., about 5.degree. C., about 10.degree. C., about
15.degree. C., or about 20.degree. C., preferably from about
-10.degree. C. to about 10.degree. C., most preferably about
0.degree. C.
[0113] In certain embodiments, the invention relates to any one of
the methods described herein, further comprising contacting
##STR00104##
with a base, thereby forming a salt.
[0114] In certain embodiments, the invention relates to a method
according to reaction scheme F':
##STR00105##
wherein the reaction takes place in a eighteenth solvent in the
presence of a reagent, thereby forming an fifteenth product mixture
comprising
##STR00106##
[0115] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme F', wherein
the eighteenth solvent is DMA, THF, DMF, methyl tert-butyl ether,
ethyl acetate, dioxane, acetonitrile, or DMSO or a mixture thereof,
preferably acetonitrile or ethyl acetate or a mixture thereof.
[0116] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme F', wherein
the reagent is triphosgene, phosgene gas, carbonyl diimidazole, or
another doubly activated analog of carbonic acid, preferably
carbonyl diimidasole.
[0117] In certain embodiments, the invention relates to any one of
the methods described herein, further comprising crystallizing
##STR00107##
or a salt thereof, to obtain the compound in a crystalline
form.
[0118] In certain embodiments, the invention relates to a method
according to reaction scheme G:
##STR00108##
wherein the reaction takes place in a ninth solvent in the presence
of a fourth base, thereby forming a seventh product mixture
comprising
##STR00109##
[0119] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme G, wherein
the ninth solvent is DMA, THF, DMF, methyl tert-butyl ether, ethyl
acetate, dioxane, acetonitrile, or DMSO or a mixture thereof,
preferably THF.
[0120] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme G, wherein
the fourth base is NaOtBu, LiOtBu, KOtBu, NaOH, LiOH, KOH, NaH,
LiH, or KH, preferably NaH.
[0121] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme G, wherein
the reaction of scheme G takes place at a ninth temperature, such
as from about -10.degree. C. to about 30.degree. C., for example
about -10.degree. C., about -5.degree. C., about 0.degree. C.,
about 5.degree. C., about 10.degree. C., about 15.degree. C., about
20.degree. C., about 25.degree. C., or about 30.degree. C.,
preferably from about 0.degree. C. to about 25.degree. C. or from
about 0.degree. C. to about 20.degree. C., most preferably about
10.degree. C. or about 20.degree. C.
[0122] In certain embodiments, the invention relates to any one of
the methods described herein, further comprising contacting
##STR00110##
with a base, thereby forming a salt, wherein preferably the base is
diisopropylamine.
[0123] In certain embodiments, the invention relates to any one of
the methods described herein, further comprising crystallizing
##STR00111##
or a salt thereof, to obtain the compound in a crystalline
form.
[0124] In certain embodiments, the invention relates to a method
according to reaction scheme G':
##STR00112##
wherein the reaction takes place in a seventeenth solvent in the
presence of an oxidant, thereby forming a fourteenth product
mixture comprising
##STR00113##
[0125] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme G', wherein
the oxidant comprises an oxidation catalyst.
[0126] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme G', wherein
the oxidant comprises a stoichiometric oxidant.
[0127] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme G', wherein
the oxidant comprises an oxidation catalyst and a stoichiometric
oxidant.
[0128] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme G', wherein
the oxidation catalyst is a source of osmium tetroxide.
[0129] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme G', wherein
the source of osmium tetroxide is preferably K.sub.2OsO.sub.4.
[0130] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme G', wherein
the stoichiometric oxidant is a trialkylammonium N-oxide, for
example, N-methylmorpholine-N-oxide (NMO) or trimethylamine
N-oxide, preferably N-methylmorpholine N-oxide.
[0131] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme G', wherein
the oxidant is a stoichiometric oxidant, for example or preferably
potassium permanganate.
[0132] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme G', wherein
the seventeenth solvent is water, DMA, toluene, THF, acetone,
heptane, hexane, methyl tert-butyl ether, ethyl acetate, dioxane,
DMF, acetonitrile, or DMSO or a mixture thereof, preferably ethyl
acetate or water or a mixture thereof.
[0133] In certain embodiments, the invention relates to any one of
the methods described herein, further comprising crystallizing
##STR00114##
or a salt thereof, to obtain the compound in a crystalline
form.
[0134] In certain embodiments, the invention relates to a method
according to reaction scheme H:
##STR00115##
wherein the reaction takes place in an eighth solvent, thereby
forming a sixth product mixture comprising
##STR00116##
[0135] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme H, wherein
the eighth solvent is DMA, toluene, THF, acetone, heptane, hexane,
methyl tert-butyl ether, ethyl acetate, dioxane, DMF, acetonitrile,
or DMSO or a mixture thereof, preferably toluene or DMF or a
mixture thereof.
[0136] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme H, wherein
the reaction of scheme H takes place at an eighth temperature, such
as from about 30.degree. C. to about 60.degree. C., for example,
about 30.degree. C., about 35.degree. C., about 40.degree. C.,
about 45.degree. C., about 50.degree. C., about 55.degree. C., or
about 60.degree. C., preferably about 35.degree. C. to about
55.degree. C., most preferably about 45.degree. C.
[0137] In certain embodiments the invention related to any one of
the methods described herein, further comprising isolating
##STR00117##
from the sixth product mixture, thereby obtaining substantially
pure
##STR00118##
[0138] In certain embodiments, the invention relates to any one of
the methods described herein, further comprising crystallizing
##STR00119##
to obtain the compound in a crystalline form.
[0139] In certain embodiments, the invention relates to a method
according to reaction scheme I:
##STR00120##
wherein Step 1 of the reaction takes place in a sixth solvent at a
sixth temperature to effect a Claisen rearrangement, and Step 2 of
the reaction takes place in a seventh solvent at a seventh
temperature, thereby forming a fifth product mixture comprising
##STR00121##
[0140] In certain embodiments, the invention relates to any one of
the methods described herein including a reaction of scheme I,
wherein the sixth solvent is DMA, toluene, dichloromethane, THF,
heptane, methyl tert-butyl ether, ethyl acetate, dioxane, DMF,
acetonitrile, or DMSO or a mixture thereof, preferably DMF.
[0141] In certain embodiments, the invention relates to any one of
the methods described herein including a reaction of scheme I,
wherein the sixth temperature is from about 60.degree. C. to about
100.degree. C., for example about 60.degree. C., about 65.degree.
C., about 70.degree. C., about 75.degree. C., about 80.degree. C.,
about 85.degree. C., about 90.degree. C., about 95.degree. C., or
about 100.degree. C., preferably about 70.degree. C. to about
90.degree. C., most preferably about 80.degree. C.
[0142] In certain embodiments, the invention relates to any one of
the methods described herein including a reaction of scheme I,
wherein the seventh solvent is DMA, toluene, dichloromethane, THF,
acetone, heptane, methyl tert-butyl ether, ethyl acetate, dioxane,
DMF, acetonitrile, or DMSO or a mixture thereof, preferably
DMF.
[0143] In certain embodiments, the invention relates to any one of
the methods described herein including a reaction of scheme I,
wherein the seventh temperature is from about 0.degree. C. to about
40.degree. C., for example, about 0.degree. C., about 5.degree. C.,
about 10.degree. C., about 15.degree. C., about 20.degree. C.,
about 25.degree. C., about 30.degree. C., about 35.degree. C., or
about 40.degree. C., preferably about 10.degree. C. to about
30.degree. C., most preferably about 20.degree. C.
[0144] In certain embodiments, the invention relates to any one of
the methods described herein, further comprising isolating
##STR00122##
from the fifth product mixture, thereby obtaining substantially
pure
##STR00123##
[0145] In certain embodiments, the invention relates to any one of
the methods described herein, further comprising
recrystallizing
##STR00124##
to obtain the compound in a crystalline form.
[0146] In certain embodiments, the invention relates to a method
according to reaction scheme J:
##STR00125##
wherein the reaction takes place in a fifth solvent in the presence
of a first acid and a hydrogen source, thereby forming a fourth
product mixture comprising
##STR00126##
[0147] In certain such embodiments, the Pd/C can be replaced with
another suitable hydrogenation catalyst. The hydrogen source is
preferably H.sub.2, but can be any suitable hydrogen source, such
as formic acid or a secondary alcohol, such as isopropanol.
[0148] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme J, wherein
the fifth solvent is methanol, ethanol, isopropanol, n-propanol,
water, formic acid, acetic acid, or n-butanol or a mixture thereof,
preferably methanol or water or a mixture thereof.
[0149] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme J, wherein
the first acid is HCl, HBr, H.sub.2SO.sub.4, CH.sub.3SO.sub.3H, or
CF.sub.3SO.sub.3H, preferably HCl.
[0150] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme J, wherein
the reaction of scheme J takes place at a fifth temperature, such
as from about 30.degree. C. to about 90.degree. C., for example,
about 30.degree. C., about 35.degree. C., about 40.degree. C.,
about 45.degree. C., about 50.degree. C., about 55.degree. C.,
about 60.degree. C., about 65.degree. C., about 70.degree. C.,
about 75.degree. C., about 80.degree. C., about 85.degree. C., or
about 90.degree. C., preferably about 50.degree. C. to about
70.degree. C., most preferably about 60.degree. C.
[0151] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme J, wherein
the reaction takes place over a fifth period of time, such as about
1 h to about 12 h, for example, about 1 h, about 2 h, about 3 h,
about 4 h, about 5 h, about 6 h, about 7 h, about 8 h, about 9 h,
about 10 h, about 11 h, or about 12 h, preferably about 6 h to
about 10 h, most preferably about 8 h.
[0152] In certain embodiments, the invention relates to any one of
the methods described herein, further comprising isolating
##STR00127##
from the fourth product mixture, thereby obtaining substantially
pure
##STR00128##
[0153] In certain embodiments, the invention relates to any one of
the methods described herein, further comprising contacting
##STR00129##
with a base, thereby forming a salt.
[0154] In certain embodiments, the invention relates to any one of
the methods described herein, further comprising crystallizing
##STR00130##
or a salt thereof, to obtain the compound in a crystalline
form.
[0155] In certain embodiments, the invention relates to a method
according to reaction scheme K:
##STR00131##
wherein Step 1 of the reaction takes place in a third solvent in
the presence of a second base; and Step 2 of the reaction takes
place in a fourth solvent in the presence of a third base, thereby
forming a third product mixture comprising
##STR00132##
[0156] In certain such embodiments, triphosgene can be replaced
with phosgene gas, carbonyl diimidazole, or another doubly
activated analog of carbonic acid.
[0157] In certain such embodiments, the acid of the t-butyl glycine
can be esterified (e.g., as a lower alkyl ester) during the
carbamation, and subsequently deprotected under suitable
deesterifying conditions (e.g., acid for t-butyl esters, acid or
base for methyl/ethyl esters, and fluoride for 2-trimethylsilyl
ethyl esters), with or without isolation or purification of the
intermediate carbamate-ester, to reveal the carboxylic acid.
[0158] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme K, wherein
the third solvent is DMA, toluene, dichloromethane, THF, acetone,
heptane, hexane, methyl tert-butyl ether, ethyl acetate, dioxane,
DMF, acetonitrile, or DMSO or a mixture thereof, preferably
toluene.
[0159] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme K, wherein
the second base is pyridine, Et.sub.3N, (iPr).sub.2EtN,
2,6-lutidine, 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU),
4-dimethylaminopyridine (DMAP), or 2,6-di-tert-butylpyridine,
preferably 2,6-lutidine.
[0160] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme K, wherein
Step 1 of the reaction of scheme K takes place at a third
temperature, such as about -10.degree. C. to about 20.degree. C.,
for example about -10.degree. C., about -5.degree. C., about
0.degree. C., about 5.degree. C., about 10.degree. C., about
15.degree. C., or about 20.degree. C., preferably about -10.degree.
C. to about 10.degree. C., most preferably about 0.degree. C.
[0161] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme K, wherein
Step 1 of the reaction of scheme K takes place over a third period
of time, such as about 10 min to about 40 min, for example, about
10 min, about 15 min, about 20 min, about 25 min, about 30 min,
about 35 min, or about 40 min, preferably about 15 min to about 25
min, most preferably about 25 min.
[0162] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme K, wherein
the fourth solvent comprises DMA, water, toluene, dichloromethane,
THF, acetone, heptane, methyl tert-butyl ether, ethyl acetate,
dioxane, DMF, acetonitrile, or DMSO or a mixture thereof,
preferably toluene or water.
[0163] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme K, wherein
the third base is K.sub.2HPO.sub.4, K.sub.3PO.sub.4, or a mixture
thereof, Na.sub.2HPO.sub.4, Na.sub.3PO.sub.4, KOH, NaOH, or LiOH or
a mixture thereof, preferably NaOH.
[0164] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme K, wherein
Step 2 of the reaction of scheme K takes place at a fourth
temperature, such as from about 0.degree. C. to about 40.degree.
C., for example, about 0.degree. C., about 5.degree. C., about
10.degree. C., about 15.degree. C., about 20.degree. C., about
25.degree. C., about 30.degree. C., about 35.degree. C., or about
40.degree. C., preferably about 10.degree. C. to about 30.degree.
C., most preferably about 20.degree. C.
[0165] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme K, wherein
Step 2 of the reaction of scheme K takes place over a fourth period
of time, such as about 1 h to about 30 h, for example, about 1 h,
about 5 h, about 10 h, about 15 h, about 20 h, about 25 h, or about
30 h, preferably about 10 h to about 20 h, most preferably about 16
h.
[0166] In certain embodiments, the invention relates to any one of
the methods described herein, further comprising isolating
##STR00133##
from the third product mixture, thereby obtaining substantially
pure
##STR00134##
[0167] In certain embodiments, the invention relates to any one of
the methods described herein, further comprising contacting
##STR00135##
with a base, thereby forming a salt.
[0168] In certain embodiments, the invention relates to any one of
the methods described herein, further comprising crystallizing
##STR00136##
or a salt thereof, to obtain the compound in a crystalline
form.
[0169] In certain embodiments, the invention relates to a method
according to reaction scheme L:
##STR00137##
wherein the reaction takes place in a second solvent in the
presence of a first enzyme, thereby forming a second product
mixture comprising
##STR00138##
[0170] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme L, wherein
the second solvent is an aqueous phosphate buffer.
[0171] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme L, wherein
the second solvent is an aqueous buffer having pH about 6 to about
8, for example, about 6, about 6.5, about 7, about 7.5, or about 8,
preferably about 7.
[0172] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme L, wherein
the second solvent comprises K.sub.2HPO.sub.4, KH.sub.2PO.sub.4,
Na.sub.2HPO.sub.4, NaH.sub.2PO.sub.4, or a mixture thereof,
preferably K.sub.2HPO.sub.4 or KH.sub.2PO.sub.4 or a mixture
thereof.
[0173] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme L, wherein
the first enzyme is a lipase.
[0174] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme L, wherein
the first enzyme is lipase from Candida antartica.
[0175] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme L, wherein
the first enzyme is on a solid support.
[0176] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme L, wherein
the first enzyme is lipase acrylic resin.
[0177] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme L, wherein
the first enzyme is lipase acrylic resin from Candida
antartica.
[0178] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme L, wherein
the reaction of scheme L takes place at a second temperature, such
as about 0.degree. C. to about 40.degree. C., for example, about
0.degree. C., about 5.degree. C., about 10.degree. C., about
15.degree. C., about 20.degree. C., about 25.degree. C., about
30.degree. C., about 35.degree. C., or about 40.degree. C.,
preferably about 10.degree. C. to about 30.degree. C., most
preferably about 20.degree. C.
[0179] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme L, wherein
the reaction of scheme L takes place over a second period of time,
such as from about 1 h to about 50 h, for example, about 1 h, about
5 h, about 10 h, about 15 h, about 20 h, about 25 h, about 30 h,
about 35 h, about 40 h, about 45 h, or about 50 h, preferably about
15 h to about 35 h, most preferably about 25 h.
[0180] In certain embodiments, the invention relates to a method
according to reaction scheme M:
##STR00139##
wherein the reaction takes place in a first solvent in the presence
of a first base, thereby forming a first product mixture
comprising
##STR00140##
[0181] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme M, wherein
the first solvent is toluene, dichloromethane, THF, acetone,
heptane, hexane, methyl tert-butyl ether, ethyl acetate, dioxane,
DMF, acetonitrile, or DMSO or a mixture thereof, preferably
heptane.
[0182] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme M, wherein
the first base is triethylamine, (iPr).sub.2EtN, or
N-methylmorpholine, preferably (iPr).sub.2EtN.
[0183] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme M, wherein
the first base is triethylamine, (iPr).sub.2EtN, Et.sub.2NH, or
(iPr).sub.2NH, preferably (iPr).sub.2EtN.
[0184] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme M, further
comprising adding a first catalyst.
[0185] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme M, wherein
the first catalyst is DMAP.
[0186] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme M, wherein
the reaction of scheme M takes place at a first temperature, such
as about -10.degree. C. to about 20.degree. C., for example about
-10.degree. C., about -5.degree. C., about 0.degree. C., about
5.degree. C., about 10.degree. C., about 15.degree. C., or about
20.degree. C., preferably about -10.degree. C. to about 10.degree.
C., most preferably about 0.degree. C.
[0187] In certain embodiments, the invention relates to any one of
the methods described herein including reaction scheme M, wherein
the reaction of scheme M takes place over a first period of time,
such as about 5 h to about 15 h, for example about 5 h, about 6 h,
about 7 h, about 8 h, about 9 h, about 10 h, about 11 h, about 12
h, about 13 h, about 14 h, about 15 h, preferably about 8 h to
about 14 h, most preferably about 11 h.
[0188] In certain embodiments, the invention relates to any one of
the methods described herein, further comprising isolating
##STR00141##
from the first product mixture, thereby obtaining substantially
pure
##STR00142##
[0189] In certain embodiments, the invention relates to any one of
the methods described herein, further comprising the steps outlined
in any other method described herein.
[0190] In certain embodiments, the invention relates to the use of
any one of the compounds described herein in the manufacture of a
medicament.
[0191] Definitions of variables in the structures in the schemes
herein are commensurate with those of corresponding positions in
the formulae delineated herein.
[0192] The compounds described herein contain one or more
asymmetric centers and thus give rise to enantiomers,
diastereomers, and other stereoisomeric forms that may be defined,
in terms of absolute stereochemistry, as (R)- or (S)-, or as (D)-
or (L)- for amino acids. Optical isomers may be prepared from their
respective optically active precursors by the procedures described
above, or by resolving the racemic mixtures. The resolution can be
carried out in the presence of a resolving agent, by chromatography
or by repeated crystallization or by some combination of these
techniques which are known to those skilled in the art. Further
details regarding resolutions can be found in Jacques, et al.,
Enantiomers. Racemates, and Resolutions (John Wiley & Sons,
1981).
[0193] The synthesized compounds can be separated from a reaction
mixture and further purified by a method such as column
chromatography, high pressure liquid chromatography, or
recrystallization. As can be appreciated by the skilled artisan,
further methods of synthesizing the compounds of the formulae
herein will be evident to those of ordinary skill in the art.
Additionally, the various synthetic steps may be performed in an
alternate sequence or order to give the desired compounds. In
addition, the solvents, temperatures, reaction durations, etc.
delineated herein are for purposes of illustration only and one of
ordinary skill in the art will recognize that variation of the
reaction conditions can produce the desired bridged macrocyclic
products of the present invention. Synthetic chemistry
transformations and protecting group methodologies (protection and
deprotection) useful in synthesizing the compounds described herein
are known in the art and include, for example, those such as
described in R. Larock, Comprehensive Organic Transformations, VCH
Publishers (1989); T. W. Greene and P.G.M. Wuts, Protective Groups
in Organic Synthesis, 2d. Ed., John Wiley and Sons (1991): L.
Fieser and M. Fieser, Fieser and Fieser's Reagents for Organic
Synthesis, John Wiley and Sons (1994); and L. Paquette, ed.,
Encyclopedia of Reagents for Organic Synthesis, John Wiley and Sons
(1995), and subsequent editions thereof.
[0194] The recitation of a listing of chemical groups in any
definition of a variable herein includes definitions of that
variable as any single group or combination of listed groups. The
recitation of an embodiment for a variable herein includes that
embodiment as any single embodiment or in combination with any
other embodiments or portions thereof.
EXEMPLIFICATION
[0195] The present invention is further illustrated by the
following Examples, which should not be construed as limiting in
any way. The Examples and discoveries described herein are
representative. As such, the studies and results described in the
Examples section herein may be used as a guideline.
Example 1--Synthesis of 70
[0196] The synthesis of compound 70 is shown in the scheme below.
Allyl alcohol 25 is used in the opening of cyclopentenoxide 24 to
give racemic alcohol 26. The allyl group serves as a protecting
group in the synthesis of 70, so the epoxide opening could
alternatively be conducted using other alcohols, such as benzyl
alcohol, 4-methoxylbenzyl alcohol, etc. The free alcohol in 26 is
acetylated to give 27 which is then subjected to enzymatic
resolution to yield the (R,R) alcohol 13. The resolved alcohol 13
is then converted to the carbamate 6 which can be isolated as the
DCHA salt. Carbamate 6 is also used in the ring-closing metathesis
(RCM) route for the synthesis of 1. The allyl group in 6 is cleaved
to yield the hydroxy carbamate 70 which can be isolated as the
diisopropylammonium (DTPA) or DCHA salts.
##STR00143## ##STR00144##
##STR00145##
[0197] BF.sub.3 etherate (0.32 g, 2.25 mmol, 0.013 equiv.) was
added to 140 mL of toluene precooled to 5.degree. C. To the
resulting solution was added a mixture of allyl alcohol (25, 43.5
g, 750 mmol, 4.4 equiv.) and cyclopentene oxide (24, 14.5 g, 172
mmol) in toluene (40 mL) over 2 h at 0 to 5.degree. C. The mixture
was warmed to r.t. over approximately 3 h and mixed overnight. The
mixture was cooled to 10.degree. C. and quenched with 50 mL of 10%
K.sub.2CO.sub.3 added in one portion. The mixture was stirred for
20 min at 10 to 15.degree. C. and then the aqueous layer was
separated. The toluene layer was washed again with 50 mL of 10%
K.sub.2CO.sub.3. The toluene layer was concentrated by rotary
evaporation to 26.6 g of oil which was assayed for 18.9 g (77%
yield) of product 26. A 25 g sample was separated and distilled
under vacuum. The main fraction (16.0 g, 69% adjusted yield) was
collected at 62 to 67.degree. C. and -3 mm Hg.
##STR00146##
[0198] To a flask was charged 33.6 g of 26 (236 mmol) and 155 g of
heptanes, and 36.3 g of N,N-diisopropylethylamine (DIPEA) (281
mmol, 1.2 equiv.). To this solution was added 0.27 g of DMAP (2.2
mmol, 0.00935 equiv.) and the solution was then cooled to
-5.degree. C. To this solution was then added 25.8 g of acetic
anhydride (253 mmol, 1.07 equiv.) over approximately 30 minutes
maintaining the temperature below 10.degree. C. Another 16.2 g of
heptanes was added and the reaction mixed at 0.degree. C. After
mixing for 11 h, the reaction was quenched with 397 g of 2.5%
H.sub.3PO.sub.4 while maintaining the temperature at below
10.degree. C. and mixture was then warmed to r.t. and the layers
were mixed, settled and separated. The aqueous layer was
re-extracted with 40 g of heptanes and this was combined with the
first heptane extract. The heptane layer was then successively
washed with 68 g of 20% brine, 81 g of 5% H.sub.3PO.sub.4, and then
2.times.116 g of 20% brine. The solution was concentrated until
near completion and the final volume was 50 mL. A final sample was
taken for analysis and showed 97.1% peak area purity with no
starting material detected. The typical yield of 27 is
.about.100%.
##STR00147##
[0199] To the acetate 27 (theory 43.5 g, 236 mmol) described above
was charged a phosphate buffer solution at pH 7 prepared from 550 g
of water, 25.0 g of K.sub.2HPO.sub.4 (144 mmol, 0.61 equiv.) and
12.0 g of KH.sub.2PO.sub.4 (88.2 mmol, 0.37 equiv.). To this
mixture was charged 1.33 g of Lipase Acrylic Resin, Candida
Antartica (Novozyme 435), (3 wt % relative to 27) and the mixture
stirred at 20.degree. C. After mixing for 25 h, 140 g of solid
sodium chloride was added followed by 5 g of Hyflo and the mixture
was stirred for 1 h. The mixture was filtered through a bed of
Hyflo. The flask was rinsed with 200 g of toluene and the rinse was
transferred through the filter setup collecting with the first
filtrate. The mixture was stirred, settled and the aqueous layer
separated. The aqueous layer was then re-extracted with 175 g of
toluene, and then 105 g of toluene. The toluene extracts were then
combined and concentrated by vacuum distillation at a pressure of
approximately 100 mg Hg to a volume of approximately 150 mL. The
total solution weight was 141.3 g and assayed for 15.56 g (93.8%
yield) of the (R,R)-alcohol 13.
##STR00148##
[0200] To a flask was charged triphosgene (6.45 g, 21.75 mmol, 0.4
equiv.), and a solution of alcohol 13 (70.66 g, containing 7.73 g
of alcohol, 54.4 mmol, 1.0 equiv.) in toluene. The solution also
contained 10.5 g of the (S,S)-acetate 28. To this mixture was added
106.6 g of toluene and the solution mixed and then cooled to
-10.degree. C. The 2,6-lutidine (8.85 g, 83 mmol, 1.52 equiv.), was
added keeping the temperature below 0.degree. C. After mixing for
25 min, formation of the chloroformate 43 was complete. A quench
solution was prepared using 130 g of 5% NaH.sub.2PO.sub.4 and
adjusted to pH 2 with phosphoric acid (3.13 g, 27.2 mmol) and the
solution cooled to -2.degree. C. The reaction mixture was
transferred into the quench solution maintaining the temperature
below 5.degree. C. The layers were mixed at 0.degree. C. and
aqueous layer was separated and the toluene layer was washed with
150 g of cold 20% brine. The toluene solution of the chloroformate
43 was used directly in the next reaction.
[0201] To a flask was charged t-Leucine 14 (8.56 g, 65 mmol, 1.2
equiv.) and water (163 mL) and NaOH (4.77 g, 119 mmol, 2.2 equiv.)
and the solution mixed and cooled to 0.degree. C. To this solution
mixing at high rpm was added the toluene solution of the
chloroformate 43 over 5 minutes, rinsing with 10 g of toluene, and
keeping the temperature below 5.degree. C. The reaction temperature
was held at 1.degree. C. for 2 h, and then warmed to 20.degree. C.
After mixing for 16 h the mixing was stopped and the layers were
allowed to settle. The aqueous layer containing the product was
separated, and the toluene layer was washed with 10 g of water and
the aqueous layers were combined. To the aqueous product solution
was added 7.5 g of sodium chloride and mixed to dissolve the
solids. The aqueous layer was then diluted with 31.7 g of IPAc and
141 g of heptanes. The pH of the aqueous layer was adjusted to 2.5
using phosphoric acid, and the layers were mixed settled and
separated. The IPAc/heptane layer was then washed with 201 g of 20%
brine. The IPAc/heptane layer was dried with magnesium sulfate and
then filtered through a pad of Hyflo filter aid, and rinsed with
12.8 g of heptanes. The filtrate weight was 197 g, and assayed for
14.05 g (46.9 mmol) of acid 44.
[0202] To this solution was added 1.025 g (56.9 mmol, 1.2 equiv.
relative to 44) of water and 8.575 g (47.3 mmol, 1.008 equiv.
relative to 44) of dicyclohexylamine. After mixing at r.t. for 2 h,
the product crystallized and a white slurry was obtained. The
slurry was filtered and rinsed with 30 g of heptane. The solid was
dried in a vacuum oven and the product assayed for an 83% yield of
6.
##STR00149##
[0203] The compound 6 (10 g, 1.0 equiv) is dissolved in
2-methyltetrahydrofuran (82 g). A 20% HCl solution (15 g) is
charged and the resulting thick white slurry is mixed, filtered,
and the wet cake rinsed with 2-methyltetrahydrofuran (13 g). The
aqueous layer in the filtrate is separated and the organic layer is
washed with 10% HCl (20 g) and then water (20 g). The organic layer
is concentrated to approximately 16 mL and then transferred to a
nitrogen flushed flask containing 0.8 g of 5% Pd/C (dry basis).
Then 26 g of methanol and 27 g of a 0.6% HCl solution are charged
to the flask. The temperature of the reaction is adjusted to
60.+-.5.degree. C. and mixed for at least 8 h until completion. The
reaction is cooled to r.t. and the slurry filtered through a bed of
hyflo, rinsing with a solution of methanol:water. The filtrate is
concentrated .about.39 mL and sodium phosphate monobasic (0.5 g) is
charged and mixed until dissolution. The solution is extracted
twice with IPAc (61 g total) and the combined IPAc extracts are
concentrated to a volume of .about.23 mL. The solution is chased
with IPAc to remove water, maintaining the volume at .about.23 mL.
The solution is heated to 45.degree. C. and diisopropylamine (1.3
g) is charged while maintaining the temperature at 45.degree. C.
The crystallization is seeded and then diisopropylamine (0.5 g) is
added followed by heptanes (38 g). The slurry is cooled to r.t.,
filtered, rinsing with IPAc/heptanes. The product 70 is dried under
vacuum and the typical yield is 85-90%.
Example 2--Synthesis of 69
[0204] The synthesis of 69 shown in the scheme below begins with
the addition of allyl alcohol 25 to trifluoropyruvate 60 and
chlorination to yield 61. The zinc reduction of 61 yields the enol
ether 62 which upon heating undergoes Claisen rearrangement to the
keto ester 63. Condensation with diaminobenzene 18 yields the
quinoxaline 64, which is subjected to chlorination to product 65.
The displacement of the chloride with Boc-Hyp-OH 21 yields the acid
66 which can be isolated as the DTPA salt. The alkene in compound
66 is epoxidized to yield 67 which undergoes epoxide ring opening
with strong base to yield the allylic alcohol 68. Removal of the
Boc protecting group of 68 is accompanied with esterification to
yield the ester 69. The methyl ester is shown but alternate esters
can be formed, as well as alternate salts.
##STR00150## ##STR00151##
##STR00152##
[0205] To a flask is charged dichloromethane (30 mL) followed by
pyridine (1.30 equiv) and then by ethyl
3,3,3-trifluoro-2-oxopropanoate 60 (10.0 g, 1.0 equiv). The
temperature of the solution is adjusted to 0.degree. C. and allyl
alcohol 25 (1.05 equiv) is charged while maintaining the
temperature below 15.degree. C. This solution is transferred to a
cold solution of thionyl chloride (1.30 equiv.) in dichloromethane
(30 mL) while maintaining the temperature below 15.degree. C. A
rinse of dichloromethane (10 mL) is used to complete the transfer.
Upon reaction completion, the crude product solution is quenched
into cold 20 wt % aqueous potassium phosphate tribasic (60 mL)
maintaining the temperature below 25.degree. C. The layers are
mixed, settled and separated. The dichloromethane layer is washed
with 5 wt % hydrochloric acid (50 mL) and then 20 wt % aqueous
potassium phosphate tribasic (30 mL). The dichloromethane layer is
dried with sodium sulfate rinsing the solids with dichloromethane.
DMF (7 g) is charged and the solution concentrated to remove most
of the dichloromethane, then diluted with DMF (7 g). The yield of
61 is typically 80-90% with >98 PA % purity as determined by gas
chromatographic (GC) analysis.
##STR00153##
[0206] The solution of 61 (10 g, 1.0 equiv) in DMF is charged to a
flask and sparged with nitrogen and cooled to 0.degree. C. To
another flask is charged Zn dust (1.30 equiv) and DMF (20 mL) and
the slurry is sparged with nitrogen. The Zn slurry is cooled to
15.degree. C. and chlorotrimethylsilane (0.10 equiv) is added with
vigorous mixing of the slurry for approximately 90 minutes. The
zinc slurry is cooled to 0.degree. C. and then transferred to the
solution of 61 in portions while maintaining the temperature of
below 15.degree. C. Upon reaction completion, the reaction is
filtered through celite, rinsing with DMF (10 mL) to wash the
solids.
[0207] The DMF solution of 62 is heated to 80.degree. C. to
complete the Claisen rearrangement. Upon completion, the reaction
is cooled to 0.degree. C. A solution of benzene 1,2-diamine 18
(0.90 equiv) in DMF (7.5 mL) is sparged with nitrogen and then
charged to the reaction maintaining a temperature below 25.degree.
C.; rinsing with DMF (2.5 mL) to complete the transfer. The
temperature is adjusted to 20.degree. C. and mixed until reaction
completion. The temperature is adjusted to 40.degree. C. and a 10
wt % aqueous ammonium chloride solution (.about.95 mL) is slowly
charged to crystallize the product 64. The slurry is cooled and
filtered, washing the wet cake aqueous DMF and then water. The wet
cake is dried to remove residual water. The crude product 64 can be
recrystallized from toluene or toluene/heptane. The typical yield
of 64 is 65%.
##STR00154##
[0208] To a flask was charged 64 (22 g, 1.0 equiv.), toluene (132
mL) and DMF (7.15 g, 1.05 equiv.). Then POCl.sub.3 (15.9 g, 1.1
equiv.) was added and the reaction mixture heated to 45.degree. C.
Upon reaction completion, the mixture was cooled to -5.degree. C.
and cold water (88 mL) was slowly added to quench the reaction. The
mixture was warmed to r.t. and stirred for 1 hour. The lower
aqueous layer was separated and the toluene layer was washed with
water (110 mL), 10% aqueous K.sub.2HPO.sub.4 solution (110 g), and
25% brine solution (110 g). The toluene layer was dried with
magnesium sulfate, filtered, rinsing with toluene, and the filtrate
was concentrated. The crude product was solvent switched to
isopropyl alcohol (IPA) and crystallized from IPA/water. The dry
weight of 65 was 22.6 g for a 94% yield.
##STR00155##
[0209] A solution of 65 (10 g, 1.0 equiv) in THF (19 g) is cooled
below 10.degree. C. To a flask is charged sodium hydride (60% in
mineral oil, 2.2 equiv) and THF (34 g) and the mixture cooled to
15.degree. C. A solution of Boc-L-Trans-Hydroxyproline 21 (1.10
equiv) in THF (30 g) is cooled to 15.degree. C. and then slowly
charged to the NaH slurry maintaining the temperature below
25.degree. C. The mixture is stirred at 20.degree. C. for
approximately 20 minutes and is then cooled to less than 10.degree.
C. The solution of 65 is slowly charged to the slurry of 21
maintaining the temperature below 10.degree. C. The reaction is
adjusted to 20.degree. C. and mixed until completion of the
reaction. The reaction is cooled below 10.degree. C., and cold
water (63 g) is slowly charged to the reaction while maintaining
the temperature below 25.degree. C. The quenched reaction is
adjusted to 22.degree. C. and heptane (47 g) is charged, mixed, and
then the product-containing aqueous layer is separated. MTBE (34 g)
and heptane (16 g) are added to the product-containing aqueous
layer, mixed, and then separated. MTBE (39 g) is added to the
product containing aqueous layer and the pH lowered to
approximately 2-3 using concentrated phosphoric acid (85%,
approximately 6 g). The layers are separated and the
product-containing organic layer is washed twice with water
(2.times.20 g). The product solution is concentrated and the
diisopropylamine salt 66 is crystallized from MTBE/heptane. The
typical yield is 90%.
##STR00156##
[0210] To a separatory funnel was added 66 (12.4 g, 22.3 mmol), and
ethyl acetate (EtOAc or EA) (89.3 g). The mixture was washed
sequentially with 1 M HCl (2.times.34 g) and then brine (39 g). The
organic layer was concentrated to .about.20 g and then chased with
CH.sub.3CN (3.times.24 g) and then diluted with CH.sub.3CN to
afford 33.6 g of a solution of the free acid of 66. To this
solution was added water (110 mL), then NaHCO.sub.3 (18.7 g) in
portions at a rate to control the gas evolution. The resulting
mixture was cooled in an ice bath and 1,1,1-trifluoroacetone (4.0
mL, 44.4 mmol, 2.0 equiv) was added. To the reaction mixture was
added Oxone.RTM. (34.1 g, 55.5 mmol, 2.5 equiv) in approximately 3
g portions over 1.5 hours. After 3.25 hours, the reaction mixture
was filtered and the solids were washed with cold EtOAc (90 g). To
the combined filtrates were quenched with 25% sodium bisulfite, pH
adjusted to 2.8. The layers were separated and the aqueous layer
was back extracted twice with EtOAc (50 g, 30 g). The combined
organic layers were then washed with brine (40 g). To the organic
layer was added 50% NaOH (1.78 g). The resulting solution was
chased with EtOAc (135 g). The resulting mixture was diluted with
EtOAc (150 g), filtered and rinsed with EtOAc (14.7 g). The
resulting solution was concentrated to 27 g and chased with 2-MeTHF
(190 g) then diluted with THF (20 g) to afford 56.44 g of a 14.7 wt
% solution of 67 in 2-MeTHF/THF (8.05 g, 74% yield). This solution
was used directly in the next step.
##STR00157##
[0211] A solution of epoxide 67 (14.6 g, 1.0 eq) in THF (258 mL)
was cooled to 0.degree. C. A solution of 1 M lithium
hexamethyldisilazide (LiHMDS) in THF (65.8 mL, 2.2 eq) was added
maintaining temperature below 5.degree. C. The reaction was mixed
for 22 h until complete. The reaction was quenched with a 3.5%
mono-potassium phosphate solution (117 g) followed by adjustment to
pH 10.5 with phosphoric acid. The reaction was extracted with MTBE
(143 mL) and the resulting aqueous product layer was extracted with
MTBE (2.times.72 mL) to remove impurities, followed by adjustment
to pH 5.5 with phosphoric acid. The product was extracted from the
aqueous layer with MTBE (290 mL total), and the organic layer was
concentrated to an oil. The crude product was purified by silica
gel chromatography using dichloromethane-MeOH. The product
fractions were concentrated and dissolved in MTBE to give an
isolated assay yield of 9.4 g product (68%).
##STR00158##
[0212] A solution of 68 (20.82 g, 1.0 eq) was concentrated and
chased with MeOH to .about.35 g and then dissolved in MeOH (84 mL).
A MeOH solution of HCl (14.5% w/w, 90 g) was slowly added and the
reaction was stirred at r.t. overnight. The reaction mixture was
concentrated to remove most of the solvent and chased with MeOH
(375 mL) to near completion. Toluene (46 mL) was added and the
mixture concentrated to .about.66 mL and the mixture diluted with
72 g of 2-MeTHF. This mixture was added to a cold 30 wt %
K.sub.2HPO.sub.4 solution (200 g), using 20 mL of 2-MeTHF to
complete the transfer. The mixture was diluted with toluene (100 g)
and mixed for 30 min. The lower aqueous layer was separated and
re-extracted twice with a mixture of toluene (100 g) and 2-MeTHF
(20 g). The combined organic extracts were washed with brine (180
g), dried over Na.sub.2SO.sub.4, filtered, and concentrated to give
28.32 g of crude product as the free amine. The product was
crystallized as the tosylate salt 69 from toluene and 2-MeTHF. The
yield was 82%. Alternatively, the product can be crystallized as
the HCl salt.
Example 3--Synthesis of 1 Via Etherification (Scheme 1)
##STR00159##
[0214] To a flask was charged 69 (1.9 g, 3.4 mmol, 1.0 equiv.) and
CH.sub.3CN (10 mL) followed by DIPEA (1.8 mL, 10. mmol, 3.0 equiv.)
and the resulting solution stirred at r.t. for 10 min. and was then
cooled to 0.degree. C. Chlorotrimethylsilane (0.57 mL, 4.5 mmol,
1.3 equiv.) was added and the solution stirred at 0.degree. C. To a
separate flask was added 70 (1.73 g, 4.81 mmol, 1.44 equiv) and
1-[bis(dimethylamino)methylene]-1H-1,2,3-triazolo[4,5-b]pyridinium
3-oxide hexafluorophosphate (HATU) (1.83 g, 4.81 mmol, 1.4 equiv)
and CH.sub.3CN (12.5 mL). The resulting yellow solution was stirred
at r.t. for 20 min. and was then added dropwise to the solution of
69 at 0.degree. C., using a 1 mL CH.sub.3CN rinse to complete the
transfer. The reaction was warmed to 20.degree. C. and stirred
overnight. Toluene (15 mL) and 5 wt % formic acid (15 mL) were
added to the reaction. The lower aqueous layer was separated and
extracted with toluene (10 mL). The combined organic layers were
washed with water (15 mL), saturated sodium bicarbonate solution
(15 mL), and water (15 mL). The toluene solution of assayed for
2.15 g of 71 for a 100% yield.
##STR00160##
[0215] A solution of 71 (25.0 g, 40.3 mmol) in toluene (12 g) was
dissolved in dichloromethane (250 mL) and cooled to -5.degree. C. A
solution of triphenylphosphine (15.85 g, 60.4 mmol) in
dichloromethane (210 mL) was cooled to 0.degree. C., and then a
solution of bromine (3.11 mL, 60.4 mmol) in dichloromethane (30 mL)
added maintaining the temperature below 10.degree. C. The
Br.sub.2/PPh.sub.3 mixture was added to the solution of 71
maintaining the temperature below 0.degree. C., rinsing with 10 mL
dichloromethane. The reaction mixture was quenched into a cold 5 wt
% aqueous sodium bicarbonate solution (365 g), rinsing with 10 mL
dichloromethane. The mixture was stirred for 12 h at 0.degree. C.,
then warmed to r.t. and mixed for 4 h. The layers were separated
and the aqueous layer was re-extracted with 44 mL of
dichloromethane. The combined dichloromethane extracts were
concentrated and solvent switched to THF. The THF solution of 104.2
g assayed at 26.0 wt % of 72 for 98.4% yield.
##STR00161##
[0216] To a flask was added a 26.0 wt % solution 72 in THF (96 g,
36.6 mmol). To this was added THF (104 g) and H.sub.2O (92.5 mL)
then cooled to 1.degree. C. Using an addition funnel, 40 wt %
Triton-B (benzyltrimethylammonium hydroxide) (57.8 mL, 146 mmol)
was added dropwise over 2 hours. The resulting solution was stirred
overnight at 0.degree. C. After 20 hours the reaction warmed to
7.degree. C. and then 2-MeTHF (225 mL) and 6 M HCl (25 mL) were
added and the resulting two layers were stirred for 10 min. This
was transferred to a separatory funnel, the lower aqueous layer was
removed and the upper organic layer was washed with 10% NaCl (112.5
mL). The organic layer was concentrated to 107 g and transferred to
a separatory funnel with toluene (175 mL). To this was added 1% KOH
(275 mL). The lower product aqueous layer was removed and the upper
organic layer was washed with 1% KOH (100 mL). The two KOH product
layers were combined and washed with toluene (2.times.125 mL). To
the aqueous layer was added 2-MeTHF (225 mL) and 6 M HCl (12.5 mL).
The layers were mixed and separated. The upper organic layer was
washed with 5% NaCl (75 mL). This afforded 181.7 g of a solution
containing 9.7 wt % of 3 for an 81.5% yield. An aliquot of the
solution (36.2 g, 3.51 g net 3) was crystallized from
MeOH/water/2-MeTHF to afford 4.08 g of a light brown solid. This
solid was reslurried in heated toluene (40 mL) to afford 3.55 g of
an off-white solid. This solid was recrystallized from
2-MeTHF/heptane to afford 3.21 g of a white solid, 88.6 wt %, for
an 81.3% crystallization yield.
##STR00162##
[0217] The acid 54 (10.0 g, 39.8 mmol, 1.0 equiv.),
1-methylcyclopropane-1-sulfonamide 55 (6.49 g, 48.0 mmol, 1.20
equiv), and HATU (17.86 g, 47.0 mmol, 1.18 equiv) were charged to a
250 mL flask followed by 120 mL of acetonitrile. Then 2,6-lutidine
(5.5 mL, 51.5 mmol, 1.29 equiv.) was added dropwise maintaining an
internal temperature below 25.degree. C. The solution was stirred
for 30 minutes and then cooled to 10.degree. C. DMAP (19.45 g,
159.2 mmol, 4.0 equiv) was added in several portions over 6 minutes
maintaining an internal temperature below 15.degree. C. The
resulting slurry was stirred overnight at 20.degree. C. The
reaction was filtered and the solids were washed with 30 mL of
IPAc. IPAc (76 mL) was added to the filtrate and the solution
washed with 20 wt % phosphoric acid (3.times.80 mL), 2 wt %
phosphoric acid (1.times.80 mL), and water (5.times.80 mL). The
IPAc solution of 56 was used directly in the next reaction.
[0218] The IPAc solution was concentrated under vacuum to an
approximate volume of 114 mL, and chased with IPAc (2.times.60 mL)
to an approximate volume of 114 mL. The slurry was cooled to
0.degree. C. and anhydrous HCl in IPA (26.56 g at 20.56 wt %, 5.46
g of HCl, 150 mmol, 3.76 equiv.) was added. The slurry was warmed
to 32.degree. C. for 14 h. Upon completion of the reaction heptanes
(98 mL) was added dropwise and the slurry cooled to 20.degree. C.
The solids were filtered, washed with heptanes (24 mL), and dried
under vacuum to give 8.9 g of compound 4 (two step yield of
70%).
##STR00163##
[0219] To a flask was charged acid 3 (45 g, 76 mmol),
2-Hydroxypyridine N-oxide (11.47 g, 103 mmol), and
1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDAC) (19.05 g, 99
mmol) followed by MeCN (180 mL) and the mixture stirred at
22.degree. C. until all the solids had dissolved. Into another
flask was charged sulfonamide 4 (25.6 g, 84 mmol), followed by MeCN
(180 mL) and triethylamine (17.0 g, 168 mmol) and the mixture
stirred at 22.degree. C. The activated acid solution from the first
flask was charged to the sulfonamide solution over .about.15 min at
22.degree. C. The transfer was completed with a MeCN rinse of 45
mL. The reaction was mixed overnight at 22.degree. C. The reaction
was quenched water (45 mL) and then heated to 45.degree. C. A
solution of 210 g of water and acetic acid (11.5 mL) was prepared
and then added to the reaction while maintaining the temperature at
45.degree. C. Seed crystals were then charged and the mixture
stirred until a slurry was formed. Water (338 g) was charged to the
reaction over 1 h maintaining the temperature at 45.degree. C. The
slurry was cooled to r.t., filtered and the product washed with a
mixture of MeCN/water. The crude product was recrystallized from
MeOH/water for an overall yield of 94%.
Example 4--Syntheses of 23
[0220] Two alternate syntheses of the macrocycle 23 are shown in
Scheme 4. The coupling of amine 80 with acid 81 yields the alkyne
82 which can be converted to macrocycle 23 by two methods. In one
approach the Ru(Bipy).sub.3Cl.sub.2 catalyzed hydro-alkylation of
82 yields macrocycle 23. In another approach the hydroboration of
82 yield the boronic acid 83 which can then undergo intramolecular
Suzuki reaction to yield the macrocycle 23. These syntheses of 23
are based on the construction of two key structural fragments of
the molecule, in particular compounds 80 and 81.
##STR00164##
[0221] The synthesis of compound 81 is outlined in Scheme 5, and is
very similar to the synthesis of compound 6. The main difference is
the use of propargyl alcohol 84 instead of allyl alcohol for the
opening of cyclopentenoxide 24. The subsequent steps follow the
same sequence as in the synthesis of 6, however the final acid 81
is converted from the DCHA salt to the free acid for the coupling
with amine 80. Detailed experimental examples are not included due
to the similarity of the route to the synthesis of 6.
##STR00165##
##STR00166## ##STR00167##
##STR00168##
[0222] To a 2-gallon pressure reactor was charged
o-phenylenediamine 18 (253.6 g, 2.345 mol, 1.0 equiv), THF (4.9 L).
To this solution was added ethyl trifluoropyruvate 60 (406.5 g,
2.390 mol, 1.02 equiv) over 30 minutes while maintaining an
internal temperature below 40.degree. C. followed by THF (0.1 L).
The reaction was heated 40-50.degree. C. until the reaction was
complete. The reaction solution was cooled to r.t. The reaction
solution was sparged with N.sub.2 and 21.2 g of 5% Pd/C was
charged. The reactor was pressurized with 40 psi of H.sub.2 and the
reaction was heated to 50.degree. C. until the reaction was
complete. The reaction mixture was cooled to rt, the solids were
removed by filtration under an N.sub.2 atmosphere and washed with
THF (0.5 L). To the filtrate was added 25% NaOH (1.12 kg). The
reaction mixture was heated to 50.degree. C. under an N.sub.2
atmosphere until reaction was complete. After cooling the reaction
mixture to 40.degree. C., 3 M HCl (2.58 kg) was added. The lower
layer was removed and the product containing upper layer was
concentrated to approximately 3 L. To the product solution was
added MeOH (0.25 L) and this was heated to 50.degree. C. To this
was charged H.sub.2O (3.75 L). The resulting mixture was cooled to
0.degree. C., held at 0.degree. C. for 2 hours. The solid was
collected by vacuum filtration, washed with a cold solution of
THF/H.sub.2O (0.3 L/0.5 L). The product was dried in the vacuum
oven to afford 447 g (97%) of 3-difluoromethylquinoxalin-2-ol 91 as
a light yellow solid. .sup.1H NMR (400 MHz, DMSO-d.sub.6) .delta.
12.81 (s, 1H), 7.86 (dd, J=7.7, 1.6 Hz, 1H), 7.64 (td, J=7.7, 1.4
Hz, 1H), 7.42-7.30 (m, 2H), 7.04 (t, J=53.2 Hz, 1H).
##STR00169##
[0223] To a flask was charged 3-difluoromethylquinoxalin-2-ol 91
(38.0 g, 0.194 mol, 1.0 equiv.), isopropylacetate (300 mL) and DMF
(1.8 mL). To this solution was charged thionyl chloride (19.0 mL,
0.260 mol, 1.34 equiv) over 5 minutes. The reaction was heated to
60.degree. C. until the reaction was complete. The reaction was
cooled to 0.degree. C. and diluted with isopropyl acetate (380 mL).
To the solution, H.sub.2O (228 mL) was added. The resulting mixture
was warmed to rt and the lower layer was removed. The upper product
layer was washed with 10% aqueous KH.sub.2PO.sub.4 (2.times.228 g)
and 20% aqueous NaCl (249 g). The upper product layer was
concentrated, chased with heptane (2.times.330 mL), heated to
50.degree. C. then cooled to 10.degree. C. The solid was collected
by vacuum filtration, washed with heptane (80 mL) and dried in the
vacuum oven to afford 37.0 g (89%) of
2-chloro-3-(difluoromethyl)quinoxaline 92. .sup.1H NMR (400 MHz,
CDCl.sub.3) .delta. 8.24 (dd, J=8.1, 1.7 Hz, 1H), 8.12 (dd, J=8.1,
1.6 Hz, 1H), 8.01-7.85 (m, 2H), 7.05 (t, J=53.4 Hz, 1H).
##STR00170##
[0224] To a flask was charged
2-chloro-3-(difluoromethyl)quinoxaline 92 (35.0 g, 0.163 mol, 1.0
equiv) and THF (700 mL). The solution was cooled to 0.degree. C.
and bromine (16.8 mL, 0.326 mol, 2.0 equiv) was added. To the
solution was charged 1.0 M LiHMDS in THF (490 mL, 0.490 mol, 3.0
equiv) over 55 min. The reaction was stirred at 0.degree. C. until
complete. To the reaction was charged 1.0 M aqueous citric acid
(175 mL). The lower layer was removed and the upper product layer
was washed with 10% aqueous sodium bisulfate (175 mL, 150 mL) and
20% aqueous sodium chloride (2.times.175 g). The organic layer was
concentrated to an oil, chased with heptane (700 mL) then diluted
with heptane (560 mL). The solution was washed with 10% aqueous
sodium chloride (125 g). The upper product layer was filtered. This
solution was concentrated to an oil and compound 93 was used
directly in the next step.
##STR00171##
[0225] To a flask was charged Boc-Hyp-OMe 94 (46.8 g, 0.191 mol,
1.27 equiv) and cesium carbonate (140.0 g, 0.430 mol, 2.87 equiv).
The 2-chloro-3-(bromodifluoromethyl)quinoxaline 93 (44.0 g, 0.150
mol, 1.0 equiv) was dissolved in DMF (200 mL), transferred into the
flask, and rinsed into the flask with DMF (90 mL). The reaction was
heated to 38.degree. C. until complete. The reaction mixture was
cooled to 20.degree. C. and MTBE (460 mL) and H.sub.2O (520 mL)
were added. The layers were separated and the upper organic layer
was washed with H.sub.2O (230 mL) and 20% aqueous sodium chloride
(230 g). To the upper organic layer was charged activated carbon
(6.0 g). This mixture was stirred for 1 hour then filtered using
MTBE (60 mL) as a wash. The filtrate was concentrated and chased
with EtOH (220 mL). To the residue was added EtOH (350 mL) and
H.sub.2O (180 mL). The mixture was cooled to 0.degree. C., filtered
and washed with a cold EtOH/H.sub.2O solution (120 mL/80 mL). The
solid was dried in a vacuum oven to afford 62.2 g (83%) of compound
95.
##STR00172##
[0226] To a flask containing 95 (13.06 g, 26.0 mmol) was added MeOH
(65 mL). This was stirred for 5 minutes, and then HCl, 4.0 M in
dioxane (32.5 mL, 130 mmol) was added over 1 minute. The resulting
yellow solution was stirred at r.t. under N.sub.2. After 4.5 hours
the solution was concentrated, chased with IPAc (50 mL), and the
solid was slurried with MeOH (17 mL) and IPAc (40 mL). This mixture
was heated to 50.degree. C. for 20 min and then added IPAc (57 mL).
The mixture was cooled in an ice bath. The solid was collected by
filtration, washed with IPAc (40 mL) and dried in the vacuum oven
to afford 10.63 g (93%) of compound 80 as an off-white solid.
##STR00173##
[0227] To a flask containing acid 81 (4.19 g, 11.27 mmol) and HATU
(4.53 g, 11.92 mmol) was added CH.sub.3CN (30 mL). This solution
was stirred at rt for 10 min. To another flask was charged amine 80
(4.85 g, 10.84 mmol), CH.sub.3CN (25 mL), and DIPEA (7.57 ml, 43.3
mmol). To this solution, the solution of acid 81 and HATU was
added, rinsing with CH.sub.3CN (3 mL). After 3 hours the reaction
was diluted with toluene (60 mL). The solution was concentrated to
remove most of the CH.sub.3CN and then washed with 1 M HCl (50 mL),
H.sub.2O (30 mL) and brine (25 mL). The organic layer was dried
over Na.sub.2SO.sub.4, and filtered. The organic layer was
concentrated and purified by silica gel chromatography to give a
90% yield of alkyne 82.
##STR00174##
[0228] To a flask was added alkyne 82 (0.102 g, 0.138 mmol),
Ru(Bipy).sub.3Cl.sub.26H.sub.2O (1.031 mg, 1.377 .mu.mol, "Bipy" is
2,2'-bipyridine), and toluene (2.0 mL). After mixing until
dissolution, DIPEA (0.048 mL, 0.275 mmol) and 1-dodecanethiol
(0.049 ml, 0.207 mmol) were added. The solution was sparged under
vacuum/N.sub.2 three times. The stirred solution was exposed to
blue-LED light at .about.30.degree. C. After 6 hours, 0.5 mL of
CH.sub.3CN was added. After 23 h the reaction was complete and a
modest yield of 23 and confirmed by HPLC analysis.
##STR00175##
[0229] In a flask Et.sub.2O (1.7 mL) and cyclohexene (0.643 ml,
6.35 mmol) were added. This was cooled in an ice bath and 5.0 M
BH.sub.3 DMS (borane dimethyl sulfide) in Et.sub.2O (0.620 ml, 3.10
mmol) was added in one portion. This mixture was stirred in the ice
bath for 3 hours under N.sub.2. The solvent was removed by vacuum
and the white solid was diluted with THF (1.4 mL). To this mixture
cooled in the ice bath, a solution of alkyne 82 (1.10 g, 1.549
mmol) in THF (2.6 mL) was added then rinsed in with THF (1.0 mL).
After 1.3 hours, the reaction was diluted with THF (5.0 mL) and
trimethylamine oxide dihydrate (0.517 g, 4.65 mmol) was added.
After 2.5 hours, water (5 mL) was added to the reaction mixture.
This was stirred for 5 min and then MTBE (7 mL) and brine (2 mL)
were added. The layers were separated and the organic layer was
washed with brine. The organic solution assayed for 89% yield of 83
which could be further purified by silica gel chromatography.
##STR00176##
[0230] To a flask was charged K.sub.3PO.sub.4 (0.044 g, 0.206
mmol), Ru(Phos) (2.89 mg, 6.19 .mu.mol, "Phos" is
2-dicyclohexylphosphino-2',6'-diisopropoxybiphenyl) and
Pd.sub.2(dba).sub.3 (1.416 mg, 1.547 .mu.mol, "dba" is
dibenzylideneacetone), and 1,2-dimethoxyethane (DME) (0.2 mL) and
the resulting mixture was stirred at 50.degree. C. for 20 min for
catalyst activation. To this mixture was added a solution of 83 (75
mg, 0.103 mmol) in DME (0.2 mL) and water (0.02 mL). The reaction
mixture was heated at 50.degree. C. for 2.5 h and modest yield of
23 was confirmed by HPLC analysis.
Example 5--Synthesis of 54 Via Cyclopropanation
[0231] The cyclopropanation route for the synthesis of compound 54
is outlined in Scheme 7. The synthesis starts with the Knoevenagel
condensation of diethylmalonate 74 with hemi-acetal 73 followed by
cyclopropanation to give diester 76. The Knoevenagel condensation
of malonate esters with the aldehyde hemiacetal 73 can be conducted
with Lewis acids such as TiCl.sub.4, Ti(OEt).sub.4,
TiCl(OEt).sub.3, CeCl.sub.3, Ce.sub.2(SO.sub.4).sub.3, MgCl.sub.2,
CaCl.sub.2) and the like. Two methods were developed for the
conversion of the racemic diester 76 into the enantiomerically pure
acid 54. The first method involves simulated moving bed resolution
of the racemic ester 78 to give the resolved (R,R) ester 79. The
second method utilizes enzymatic resolution of 76 to prepare the
resolved (R,R) acid 96. Both methods converge at the last step in
the saponification of the resolved ester 79 to the acid 54.
##STR00177##
Knoevenagel Condensation with Catalytic CeCl.sub.3/NaI
##STR00178##
[0232] To a flask was charged CeCl.sub.3 (1.54 g, 6.25 mmol, 0.05
equiv), NaI (0.94 g, 6.25 mmol, 0.05 equiv) and ethanol (80 mL) and
the mixture was stirred with heating to 65.degree. C. At reaction
temperature of 65.degree. C. a pre-mixed solution of diethyl
malonate (20 g, 125 mmol) and 21.0 g difluoroacetaldehyde ethyl
hemiacetal (90% w/w, 150 mmol, 1.2 equiv) was charged. The
resulting mixture was stirred at 60-65.degree. C. Upon completion
the reaction was cooled to ambient temperature and inorganic solids
were filtered off. The filtrate was concentrated under vacuum to
near completion, diluted with dimethylformamide (DMF) (74 g), and
concentrated under vacuum to remove the residual ethanol. The DMF
solution is used directly in the next step as both 75a and 75b are
converted to product in the cyclopropanation step.
Knoevenagel Condensation with Catalytic MgCl.sub.2
##STR00179##
[0233] To a flask was charged MgCl.sub.2 (1.189 g, 12.49) and EtOH
(140 mL, 200 proof) and to this solution at ambient temperature,
difluoroacetaldehyde ethyl hemiacetal (38.5 g, 90% w/w, 275 mmol,
1.1 equiv) was charged, followed by addition of diethyl malonate
(40.0 g, 250 mmol).
[0234] The resulting mixture was stirred at 60-65.degree. C. Upon
completion the reaction mixture was cooled to ambient temperature
and concentrated under vacuum to remove most of the ethanol. The
mixture was filtered to remove inorganic salts, DMF (74 g) was
added to the filtrate, and concentrated under vacuum to remove the
residual ethanol. The DMF solution is used directly in the next
step.
[0235] Alternatively the reaction mixture can be worked up by
concentration under vacuum to remove most of the ethanol, addition
of methyl tert-butyl ether (MTBE) (300 mL) and washing with 150 mL
1 M HCl and then 150 mL brine. The MTBE solution is dried with
MgSO.sub.4, filtered, concentrated under vacuum, diluted with DMF,
and concentrated under vacuum to remove the residual MTBE. The DMF
solution is used directly in the next step.
[0236] Other Lewis acids catalysts which have been tested include
CaCl.sub.2 and Ce.sub.2(SO.sub.4).sub.3.
Knoevenagel Condensation With TiCl(OEt).sub.3
##STR00180##
[0238] Titanium (IV) ethoxide (3.6 kg, 15.7 mol) and 2-MeTHF (18.5
kg) were charged to a flask. Acetyl chloride (1.2 kg, 15.7 mol) was
added, rinsing with 2-MeTHF (2.0 kg). The mixture heated to reflux
for 2 h and then cooled to 20.degree. C. and held overnight. The
mixture was cooled to -3.degree. C. and diethyl malonate (1.2 kg,
7.5 mol) was added, rinsing with 2-MeTHF (1.7 kg). The
difluoroacetaldehyde ethyl hemiacetal (1.0 kg, 7.5 mol) was added,
rinsing with 2-MeTHF (1.7 kg). Then triethylamine (1.6 kg, 15.7
mol) was added and the mixture stirred at 0.degree. C. for 4 h. The
mixture was gradually heated to 50-57.degree. C. and mixed for 2 h
and then cooled to 20.degree. C. and held overnight. The mixture
was cooled to 3.degree. C. and quenched with 1 M HCl (10.9 kg),
mixed at 15.degree. C., and the layers separated. The organic layer
was wash with 1 M HCl (6.2 kg) and then 20% brine (6.8 kg). The
product solution was dried with MgSO.sub.4, filtered, rinsing with
2-MeTHF. The filtrate was concentrated under vacuum to near
completion, DMF (4.7 L) was added, and the concentration continued
to remove the 2-MeTHF. The DMF solution is used directly in the
next reaction.
Cyclopropanation
##STR00181##
[0240] To a flask was charged potassium tert-butoxide (1.0 kg, 9.0
mol, 1.2 equiv), trimethylsulfoxonium iodide (2.0 kg, 9.0 mol, 1.2
equiv), and DMF (7.0 L). The mixture was stirred for 2 h, and then
a solution of 75a and 75b (7.5 mol theoretical) mixture in DMF was
added. The reaction was heated to 55.degree. C. for 3.5 h and then
cooled to 5.degree. C. and mixed overnight. The reaction was
quenched with a cold mixture of MTBE (14.4 L) and water (14.4 L),
then mixed and warmed and the layers separated. The aqueous layer
was re-extracted with MTBE (14.4 L) and the combined organic layers
were washed with 20% brine (2.times.6.8 kg), and then with water
(2.times.6 kg). The product solution was concentrated and solvent
switched to EtOH and assayed for 80% yield of 76.
Chemical Hydrolysis
##STR00182##
[0242] Tetrabutylammonium hydroxide (40 wt % aqueous, 4.3 kg) was
added to the EtOH solution of compound 76 (7.5 mol theoretical from
74) and mixed at 20.degree. C. Upon reaction completion, MTBE (14.4
L) was added and the mixture was cooled and 0.5 M HCl (14.4 L) was
added. The mixture was warmed to 20.degree. C.; the aqueous layer
was separated and re-extracted with MTBE (6 L). The combined
organic layers were washed with 20% brine solution (6.8 kg), and
then water (6 L). The product was crystallized as the
dicyclohexylamine salt from MTBE/heptanes. After filtration and
drying a total of 1124 g of compound 77 was isolated (38% yield
from 74).
Curtius Rearrangement
##STR00183##
[0244] To a flask was charged compound 77 dicyclohexylammonium
(DCHA) salt (1.1 kg) and MTBE (11 L) and the mixture was washed
twice with 7% phosphoric acid (11 L, 5.2 L), once with 20% brine
(3.1 kg), and once with water (2.8 L). The organic layer was
diluted with heptane (5.5 L) and concentrated under vacuum to a
volume of .about.4 L. Then tert-butanol (1.1 kg) and heptane (4 L)
were added followed by triethylamine (437 g). The mixture was
heated to reflux (76.degree. C.) and then diphenylphosphorylazide
(757 g) was added over 1.5 h. After heating for 10 h, the mixture
was cooled to 20.degree. C. and concentrated under vacuum to a
volume of .about.4 L. The mixture was diluted with MTBE (5.8 L) and
successively washed with 5% aqueous citric acid (5.8 L), 8% aqueous
NaHCO.sub.3 (3.2 kg), 20% brine (3.4 kg), and water (3 L). The
product solution in MTBE was solvent switched to acetonitrile
(CH.sub.3CN or MeCN or ACN) and the final solution assayed for 542
g of 78 for a 68% yield.
Simulated Moving Bed Resolution
##STR00184##
[0246] Racemic Boc amino acid ethyl ester 78 was subjected to
simulated moving bed chromatography (SMB) to yield the (1R,2R)
enantiomer 79.
Saponification
##STR00185##
[0248] A solution of the Boc amino ethyl ester 79 (2 g, 7.16 mmol)
in acetonitrile (10 mL) was treated with a solution of LiOH (193
mg, 7.88 mmol 1.1 equiv) in water (10 mL). The mixture was stirred
at ambient temperature overnight. Upon reaction completion, 15%
aqueous citric acid was added to achieve a pH of 4-4.5. The mixture
was concentrated under vacuum to remove the acetonitrile and the
resulting mixture was diluted with 5 mL water. The resulting slurry
was mixed overnight at ambient temperature, filtered and washed
with 4 mL water. The wet cake was dried in a vacuum oven to give an
isolated yield of 80%.
Enzymatic Resolution
##STR00186##
[0250] The racemic diester 76 (1 g) was dissolved in 300 mL of 0.5
M sodium phosphate buffer, pH 7.0. To the reaction was added 15.3
mL of 3.times. dialyzed RML enzyme. The reaction was incubated at
30.degree. C. and 125 revolutions per minute (rpm) for 96 hrs. Upon
reaction completion, the desired unreacted (R) diester 98 was
recovered from the aqueous reaction phase by extraction into MTBE
(2.times.60 mL). The (S) acid 97 remained in the aqueous layer. The
combined MTBE extracts were dried using magnesium sulfate,
concentrated in vacuo and the recovered diester 98 was then
dissolved in 0.5 M 150 mL sodium phosphate, pH 7.0 for use in the
second resolution step.
[0251] YvaK clarified cell lysate (10 mL) was added to the solution
of diester 98 in the sodium phosphate buffer. The reaction was
incubated at 30.degree. C. and 125 rpm for 96 hrs. Upon reaction
completion, the pH was adjusted to 3 by addition of 5 N HCl. The
acid product 96 was recovered from reaction aqueous phase by
repeated extraction with MTBE (3.times.60 mL). The combined MTBE
extracts were dried using magnesium sulfate and evaporated in vacuo
to remove MTBE. The final recovered product (1S,2R) acid 96 in MTBE
was filtered through Celite.
[0252] The acid 96 can be converted into the DCHA salt as described
for compound 77. The acid 96, or its DCHA salt, can be converted
into acid 54 by following the procedures described for the Curtius
rearrangement (converting 77 to 78) and saponification (converting
79 to 54).
[0253] RML Dialysis Procedure: Mucor miehei lipase (RML, 6 mL) was
placed in .about.10 inches of 6-8 kDa molecular weight cut-off
(MWCO) dialysis membrane and dialyzed for 4 hours in 2 liters of
0.1M sodium phosphate buffer, pH 7.0 at 4.degree. C. and approx.
125 rpm. After 4 hours, the buffer was exchanged for 2 L of fresh
0.1M sodium phosphate buffer, pH 7.0 for an additional 24 hours.
After 24 hours, the buffer was exchanged a third time for 2 L of
fresh 0.1 M sodium phosphate buffer, pH 7.0 for an additional 24
hours. The final dialysis product results in .about.18 mL of
3.times. dialyzed RML.
[0254] YvaK Clarified Cell Lysate-Enzyme Preparation Procedure:
Bacillus subtilis esterase `yvaK` (Gene ID-BSU33620) was inserted
into pET21b vector at MCS between NdeI and BamHI restriction sites
and transformed into BL21(DE3) competent cells. The yvaK esterase
was subsequently expressed by growing the culture at 30.degree. C.,
225 rpm until an OD.sub.600 of 0.5-0.8. Protein expression was
induced with isopropyl .beta.-D-1-thiogalactopyranoside (IPTG) to
0.1 mM and incubated for another for 18 hours. The resulting cell
culture was pelleted by centrifugation at 3750 rpm, 30 min,
4.degree. C. and stored at -80.degree. C. until use. Cell pellets
were resuspended in 0.5 M sodium phosphate buffer, pH 7.0 at a
ratio of 1:10 resuspension buffer volume to expression culture
volume. Resuspended culture was sonicated on ice three times for 30
s and centrifuged at 3750 rpm, 30 min, 4.degree. C. The resulting
supernatant was used as the clarified cell lysate solution.
Example 6--Synthesis of 54 Via Fluorination
##STR00187##
##STR00188##
[0256] Into a round bottom flask was charged 50 (11.2 g, 43.9 mmol)
dissolved in tetrahydrofuran (THF) (16 mL). To this solution was
charged 4-dimethylaminopyridine (DMAP) (5.62 g, 46.1 mmol). To the
resulting slurry was added a solution of Boc.sub.2O (14.36 g, 66.0
mmol) in THF (10 mL) via a syringe, over 45 minutes at room
temperature. The reaction mixture was quenched after 4.5 hours by
addition of N,N-dimethylethylenediamine (3.87 g, 44 mmol) in one
portion. The quenched reaction was mixed 30 minutes, then poured
into heptanes (50 g) and 1 M H.sub.3PO.sub.4 (120 g). The layers
were separated and the upper layer was washed with 23% brine (50
mL). The upper product-containing layer was concentrated in vacuo
to afford 16.98 g of a light orange oil. Typical assay yield is
100%.
##STR00189##
[0257] Into a round bottom flask was charged NaIO.sub.4 (42.28 g,
198.0 mmol, 4.5 equiv.), water (90 g), 2,6-lutidine (2.14 g, 20
mmol) and OsO.sub.4 (5.57 mL of a 4 wt % solution in water (0.88
mmol) and 1,4-dioxane (200 mL). The starting material 51 (15.59 g,
43.9 mmol) was dissolved in 1,4-dioxane (70 mL) and 2,6-lutidine
(7.25 g, 67.8 mmol) and charged slowly over 4 hours while
maintaining an internal temperature of <30.degree. C., via an
addition funnel. Additional NaIO.sub.4 (4.7 g, 22.0 mmol, 0.5
equiv.) was charged in one portion to the reaction mixture
(slurry). The reaction mixture was cooled and a solution of 10% aq.
sodium thiosulfate (125 mL) was charged over 15 minutes. The
precipitated NaIO.sub.3 was filtered off and was washed with
1,4-dioxane (3.times.25 mL). The filtrate was extracted with
heptane (200 mL). The layers were separated and the aqueous layer
was re-extracted with a 4:1 heptane-MTBE solution (200 mL). The
combined organic layers were washed sequentially with 7% aqueous
NaHCO.sub.3 solution (100 mL); 1 M H.sub.3PO.sub.4 (100 mL); an
aqueous solution comprised of 20 mL of 10% aqueous
NaH.sub.2PO.sub.4 solution and 80 mL 20% aqueous NaCl; 7% aq.
NaHCO.sub.3 solution (100 mL) and finally washed with 20% aqueous
NaCl solution (50 mL). The organic layer was then concentrated in
vacuo and chased with heptane (40 g), concentrating in vacuo to
15.8 g. The product was crystallized from heptane (16 g) at
-25.degree. C., filtered and washed twice with 5 mL of -20.degree.
C. heptane, and dried to constant weight to afford 11.78 g, for a
75% yield of 52. The aldehyde 52 can alternatively be crystallized
from IPA/water with cooling to 0.degree. C. for filtration.
##STR00190##
[0258] The starting material 51 (500 mg, 1.407 mmol, 1.0 equiv) was
dissolved in 10 mL of dichloromethane and cooled in a -78.degree.
C. bath. Ozone was bubbled through the solution for approximately 5
min, until the solution became blue in color. The solution was
mixed for 5 min and then purged with a stream of nitrogen until the
color of the solution dissipated. Triphenylphosphine (406 mg, 1.547
mmol, 1.10 equiv) was added in one portion to the solution at
-78.degree. C. The bath was removed and the resulting solution was
allowed to warm to rt, stirring overnight. The assay yield for the
reaction was 93%.
##STR00191##
[0259] To a flask is charged 9.02 g of diethylaminosulfur
trifluoride (DAST) (2.5 eq) and 45 g of dichloromethane. To this
solution is added 0.48 g of 2,6-lutidine (0.2 eq) and the solution
is cooled to 10.degree. C. A solution of the aldehyde 52 (8.0 g,
1.0 eq) in 10 g of dichloromethane is added, rinsing with 2 g of
dichloromethane. The reaction is mixed at room temperature (RT or
rt or r.t., about 23.degree. C.) for at least 12 h. The reaction
mixture is transferred into a cold mixture of heptanes (40 g) and
18% aq. K.sub.2HPO.sub.4 (100 g), rinsing with dichloromethane. The
lower (aqueous) layer is separated, and the upper layer is washed
with mixture of 20% brine and 18% aq. K.sub.2HPO.sub.4. The upper
product containing layer is concentrated to approximately 20 mL and
then diluted with 3 g heptanes and 33 g of 5% aq. KH.sub.2PO.sub.4
solution. The biphasic mixture is stirred vigorously for at least
15 min during which time the starting aldehyde 52 is reformed. To
the reaction is charged 8 g of 18% aq. K.sub.2HPO.sub.4 and 5 g of
33% aq. sodium bisulfite solution. The reaction is stirred until
the aldehyde 52 is converted to the bisulfite complex, and then
diluted with 24 g of heptanes and the layers are separated. The
upper product containing layer is washed with 20% brine solution
and then concentrated and used in the next step. The typical assay
yield of 53 in the heptane solution is 45%.
[0260] The aqueous layer containing the starting aldehyde as the
bisulfite complex is treated with 4.2 g of sodium carbonate. The
aldehyde crystallizes out of the mixture and is cooled to 0.degree.
C. and filtered, washing with water. The typical recovery of 52 is
35%.
##STR00192##
[0261] The starting material 53 as a solution in heptane is
concentrated, chased with EtOH, and then dissolved in EtOH (6 mL/g
of 53) and THF (6 mL/g of 53). The solution is heated to 50.degree.
C. and then a 5.5% aqueous solution of LiOH (5 eq) is added and the
mixture stirred at 50.degree. C. until the reaction is complete by
high-performance liquid chromatographic (HPLC) analysis
(approximately 10 h). The mixture is cooled to rt and formic acid
(3.5 eq) is added and the mixture concentrated to approximately 7
mL/g. To this mixture is added isopropyl acetate (IPAc) (10 mL/g of
53) and formic acid (2.5 eq) to adjust the pH to .about.4.5. The
mixture is filtered, rinsing with IPAc and the aqueous layer is
separated. The upper product containing layer is washed with water,
and then brine. The IPAc solution is concentrated and the product
crystallized from IPAc/heptanes. The yield of 54 is typically
80%.
Example 7--Overview of a Synthesis of 1 Via RCM
[0262] The RCM route for the synthesis of 1, shown in Scheme 9,
utilizes a ring closing metathesis reaction as the key step in the
synthesis of the macrocycle 3. The synthesis of 1 begins with the
coupling of amine 5 with acid 6 to yield the diene 22. The diene 22
is subjected to ring closing metathesis to yield the macrocycle
ester 23. The ester 23 is then saponified to the macrocycle acid 3.
The final step is the same as the etherification route as the acid
3 is then coupled to amine 4 to yield 1. The synthesis is based on
the construction of three key structural fragments of the molecule,
in particular compounds 4, 5, and 6. The experimental examples for
the syntheses of compounds 4 and 6 are described in the
etherification route to 1. The experimental examples for the
synthesis of compound 5 will be followed by the experimental
examples for the final assembly of macrocycle acid 3.
##STR00193## ##STR00194##
Example 8--Synthesis of 5
##STR00195## ##STR00196##
##STR00197##
[0264] To a 100-mL flask was added Indium (2.44 g, 21.3 mmol, 0.67
equiv.), and the flask flushed with nitrogen for 5 min. To another
flask was charged THF (56 g) and water (20 g) and the mixture was
cooled to 15.degree. C. and sparged with nitrogen for 15 min. The
sparged solvent mixture was transferred with nitrogen pressure to
the 100 mL flask and the mixture stirred and cooled to 15.degree.
C. To the 100-mL flask was added the 3-bromo-3,3-difluoroprop-1-ene
15 (5.0 g, 31.9 mmol. 1.0 equiv.) over 25 min maintaining the
temperature at NMT 30.degree. C. After mixing for 2 h at 20.degree.
C. the indium had dissolved and a sample was analyzed by HPLC and
assayed for 0.6% of residual bromide starting material 15. After
2.8 h, the reaction was cooled to 15.degree. C. and then added the
ethyl 2-oxoacetate 29, as a 50% solution in toluene (5.87 g, 28.7
mmol, 0.9 equiv.) over 30 min while maintaining the temperature at
NMT 30.degree. C. The reaction was mixed for 1.5 h at 20.degree. C.
and assayed for 90.3% yield of 30 by HPLC analysis. The reaction
was cooled to 15.degree. C. and transferred to another flask,
rinsing with 8 g of THF. The reaction mixture was quenched with 24
g of 15% H.sub.3PO.sub.4 and then added 60 g of MTBE. The layers
were mixed, settled, and the lower aqueous layer was separated. The
THF/MTBE layer was then washed with 50 g of water, 50 g of 5%
KH.sub.2PO.sub.4, 50 g of 5% NaHCO.sub.3, and 63 g of 20% brine.
The final THF/MTBE layer was filtered and rinsed with 10 g of MTBE
and the combined filtrate was concentrated to 25 mL and then chased
with 2.times.33 g of EtOAc back to 25 mL volume. The solution was
filtered through a pad of Hyflo and rinsed with 31 g of EtOAc. The
filtrate was distilled to 10 mL volume. The solution assayed for
84.3% yield by HPLC analysis.
##STR00198##
[0265] T3P (1.2 eq as a 50% solution in ethyl acetate) is added to
a solution of alcohol 30 (1 eq., in dimethyl sulfoxide/ethyl
acetate (DMSO/EA) (3 mL of each per g of 30) over 1.5 h while
maintaining the reaction temperature at 0 to 5.degree. C. Mixing is
continued at 0.degree. C. for 1 h, then the reaction mixture is
allowed to warm to RT over 1 h. Mixing is further continued at RT
(typically 12 to 17 h) until less than 5% peak area of 30 is
detected by GC relative to product 17. The mixture is then cooled
to 2.degree. C. and triethylamine (TEA) (2.5 eq.) is added over 30
min while maintaining the temperature at less than 10.degree. C.
The pH of the reaction mixture is adjusted to 4.5 to 5.5 with
acetic acid. The mixture is then cooled to .about.2.degree. C. and
the phenylenediamine 18 solution (0.95 eq, in 1 mL/g ethyl acetate
and 1 mL/g DMSO) is added over 20 min while maintaining LT
15.degree. C. internal temperature. The mixing is continued for
.about.1 h until the reaction is complete (less than 5% ketone 17
by GC).
[0266] The mixture is then cooled to 5.degree. C. and quenched by
water addition (9 g/g of 30) over 1 h while maintaining the
internal temperature at LT 25.degree. C. The pH is then adjusted to
6 with 50% NaOH. The reaction mixture is then concentrated in vacuo
to remove ethyl acetate and TEA (the residual volume target is
approximately 15-17 mL/g of 30). Product precipitation is observed
at this point. The mixture is then further diluted with water (9
g/g of 30) to precipitate remaining product. The product is then
filtered off and the cake is washed with 4:1 water-ACN (2.5 g/g of
30). The product is dried at 45.degree. C. to less than 0.5% water
content by Karl Fischer (KF). Typical yield of 19 is 80-85%.
##STR00199##
[0267] To a flask was charged 19, 20.35 g (95.9% potency, 92 mmol,
1.0 eq.), and then DMF, (1.355 g, 18.5 mmol, 0.2 eq), and then
isopropyl acetate (89 g, of 19). The mixture was stirred at rt and
then added thionyl chloride, (15.8 g, 133 mmol, 1.45 equiv.) was
added over 5 minutes. The reaction mixture was then heated to
60.degree. C. for 16 h and then cooled to 20.degree. C. over the
weekend. The reaction was cooled to 0.degree. C. and then quenched
with 120 g of water and the mixture was diluted with 125 g of
heptanes and mixed at rt for 10 minutes. The reaction was then
filtered, rinsing with 10 g of heptanes. The mixture was
transferred to a separatory funnel and the lower aqueous layer
separated. The IPAc/heptane layer was then washed with 120 g of
water, 2 times with 120 g of 10% K.sub.2HPO.sub.4, and 150 g of 20%
brine. The IPAc/heptane layer was then filtered through a pad of
magnesium sulfate, and rinsed with 2.times.10 g of heptanes. The
solution was concentrated to near completion and diluted with 155 g
heptanes and concentrated to a volume of .about.120 mL. The
solution was diluted with 47 g heptanes and filtered through a pad
of silica gel. The filtration was completed by rinsing with 20 g of
heptanes, in portions, through the silica gel bed. A sample of the
filtrate was analyzed by HPLC and assayed for 20.34 g, or 96.2%
yield.
##STR00200##
[0268] Into a 250-mL round bottom flask was added chloro
quinoxaline 20 (5.07 g, 21.07 mmol) as a heptane solution, and DMF
(10 mL). The solution was concentrated to .about.15 mL to remove
the heptane, and was then transferred into a nitrogen flushed,
three necked flask containing 21 (5.26 g, 22.75 mmol, 1.08 equiv).
The transfer was completed by rinsing the 250-mL flask with DMF
(25.5 mL) and transferring the rinse into the three necked flask.
The reaction mixture in the three neck flask was cooled to
0.degree. C. Then a solution of NaOtBu (4.80 g, 48.5 mmol, 2.3
equiv) in DMF (30.4 mL) was added over 20 min while maintaining the
temperature below 10.degree. C. DMF (4 mL) was used to rinse the
NaOtBu container and then added into the reaction mixture. The
reaction was mixed at 0.degree. C. for 2 h and then a sample was
analyzed by HPLC and the starting material 20 was not detected. The
reaction was quenched by slowly adding 50 g of water while
maintaining the temperature at below 10.degree. C. Then MTBE (67.5
mL) was added and the mixture was warmed to rt and stirred for 5
min. The mixture was transferred to a separatory funnel, rinsing
with 25 g of water. The layers were mixed, settled and the lower
aqueous layer containing the product was separated. The MTBE layer
was extracted with water (25 mL) and the aqueous layers were
combined. The aqueous solution was extracted with EtOAc (125 mL),
and the pH adjusted to 2-3 by adding .about.8.25 g of
H.sub.3PO.sub.4 (71.6 mmol, 3.4 equiv.). The layers were mixed,
settled, and separated. The EtOAc layer was washed with water
(3.times.50 mL), saturated brine (50 mL), and dried over
Na.sub.2SO.sub.4. The product solution assayed for 8.72 g of 31,
for a 95.1% yield. The EtOAc solution was filtered, concentrated to
near completion, and solvent switched to MeOH by chase distillation
(3.times.38 mL). The final product was dissolved in 44 mL of MeOH
and was used in the next reaction.
##STR00201##
[0269] Into a 100-mL round bottom flask was added a solution of 31
in MeOH (10 g, 20.44% potency, 4.69 mmol). Then the HCl in MeOH
solution (9.24 g, 13.9 wt %, 35.2 mmol, 7.5 equiv) was added
slowly. The reaction solution was allowed to stir at r.t. over the
weekend. The reaction was concentrated to .about.5 mL and a
constant volume distillation was performed charging NLT 30 mL of
MeOH to maintain the volume at .about.5 mL. To this mixture was
slowly added 10 mL of IPAc to give a slurry. A constant volume
distillation was performed maintaining the volume at .about.15 mL
while charging 40 mL of IPAc. The slurry was mixed at rt for 3 h
and the product was filtered, washed with IPAc (3.times.2 mL),
dried in oven at 40.degree. C. for 16 h to give 1.51 g product 5 at
98% potency for an 82% yield.
Example 9--Synthesis of 3 Via RCM
##STR00202##
[0271] Dicyclohexylamine salt 6 (1.02 eq.) and HATU (1.1 eq.) are
slurried in acetonitrile (6 g/g of 6) at ambient temperature.
Formation of a clear solution is observed within 30 min. The
solution is then transferred to a vessel containing 5 (1 eq)
followed by an acetonitrile rinse (2 g/g of 6). The internal
temperature is adjusted to .about.15.degree. C. and
diisopropyethylamine (3.0 eq) is then added while maintaining the
temperature below 25.degree. C. The mixing is continued at 20 to
25.degree. C. for typically 7 to 10 h. The mixture is then diluted
with toluene (4.7 g/g of 6) and filtered to remove
dicyclohexylamine hydrochloride. The cake is washed with toluene
(2.5 g/g of 6) and the combined filtrate and wash are further
diluted with water (6.25 g/g of 6). The pH of the mixture is
adjusted to .about.3.5 with conc. HCl while maintaining NMT
30.degree. C. internal temperature. The aqueous layer is separated.
The organic layer is washed subsequently with water and 5%
potassium carbonate solution (6.25 g/g of 6 each). The organic
layer is concentrated in vacuo to a volume of .about.7.5 mL/g of 6
and purified by silica plug filtration eluting with EtOAc/heptanes.
The product solution is solvent switched to toluene and the
resulting solution typically assays for 100% yield of 22 and is
used directly in the next step.
##STR00203##
[0272] The Zhan 1B catalyst (340 mg, 0.463 mmol, 7 mole %) was
dissolved in dichloromethane (DCM) (2 mL) and toluene (12 mL). To a
500 mL flask was charged 308 mL of toluene and the solvent sparged
with nitrogen and heated to 40.degree. C. To the heated toluene
solution was added over 6 hours a solution of 22 (4 g, 6.34 mmol)
in toluene (.about.10 mL) and the solution of the catalyst at the
same rate. After the addition was complete, the reaction was
allowed to stir at 40.degree. C. for 16 h. Another catalyst charge
was prepared (47 mg, dissolved in 0.4 mL of DCM and 2 mL of
toluene), and then added to the reaction mixture. After mixing for
another 4 h, imidazole (0.426 g) and F1 Filtrol (4 g) were added to
the reaction and the mixture was stirred at rt overnight. The
reaction mixture was filtered through a silica gel plug (10 g),
eluting with 50% ethyl acetate in heptanes. The crude product was
further purified by silica gel chromatography and the product
fractions were combined, concentrated, and assayed for 2.58 g of 23
for a 67.8% assay yield.
##STR00204##
[0273] To a solution of 25.5 g of 23 (42.3 mmol) in 77 mL of MeOH
was added 102 g of 2-MeTHF and the solution cooled below 15.degree.
C. To the solution was then added a solution of NaOH (2.5 g, 62.5
mmol, 1.5 equiv.) in 62.5 g of water and the reaction was mixed at
20.degree. C. After 6 h the reaction was deemed complete by HPLC
analysis. The mixture was cooled to below 15.degree. C. and then
242 g of water was added, followed by 81 g of heptanes and 102 g of
2-MeTHF. The pH of the lower layer was adjusted to .about.10 with
H.sub.3PO.sub.4. The mixture was stirred for 10 min and then
filtered, rinsing with 20 g of water. The filtrate was mixed,
settled and the lower aqueous layer separated. The upper layer was
washed with 20 g of water and this was combined with the first
aqueous layer. The combined aqueous layers were diluted with 308 g
of 2-MeTHF and acidified to pH 3 by charging H.sub.3PO.sub.4. The
layers were mixed, settled and separated. The upper 2-MeTHF layer
was then washed twice with 10% brine. The 2-MeTHF layer was then
dried with magnesium sulfate and filtered, rinsing with 2-MeTHF.
The filtrate was concentrated to approximately 90 mL, and diluted
with 50 mL of 2-MeTHF. The solution was diluted with 48 g of
heptanes and mixed until crystallization occurred and a slurry was
formed, and then 271 g of heptanes was added. The slurry was
filtered and rinsed with 50 mL of an 80/20 mixture v/v of
heptanes/2-MeTHF. The crude product 3 was re-crystallized from
2-MeTHF/heptanes for an 83.9% yield.
Example 10--Alternative Synthesis of 69
[0274] The synthesis of compound 69 is shown in Scheme 11. In the
first step, the alkene of compound 65 is dihydroxylated to yield
the diol, compound 99. The diol 99 is then converted into the
cyclic carbonate 100 by reaction with CDI or an equivalent reagent.
The cyclic carbonate 100 is treated with base (NaHMDS) to induce
elimination forming the open carbonate, compound 101, which then
undergoes coupling with 21 to yield compound 68. Compound 68 can be
isolated as a crystalline salt, and in this example the
benzhydrylamine salt is shown. Compound 68 is then converted into
compound 69 using thionyl chloride as the reagent, instead of HCl
as shown in the previous example. Compound 69 is isolated as the
HCl salt in this example, instead of the TsOH salt as shown in the
previous example. The HCl salt of compound 69 may be used in the
coupling reaction with compound 70 to form compound 71.
##STR00205## ##STR00206##
##STR00207##
[0275] To a 1-L round bottom flask was added
2-chloro-3-(1,1-difluorobut-3-en-1-yl)quinoxaline, compound 65
(40.66 g, 157 mmol, 1.00 equiv.) followed by ethyl acetate (124 g),
K.sub.2OsO.sub.4.2H.sub.2O (0.088 g, 0.24 mmol, 0.0015 equiv.), and
50% aqueous N-methylmorpholine-N-oxide (42.32 g, 181 mmol, 1.15
equiv.). The biphasic mixture was stirred for 22.5 h at 40.degree.
C. After cooling to 23.degree. C., an aqueous solution of 15%
sodium sulfite (144 g) was added followed by ethyl acetate (124 g).
After two hours the biphasic mixture was transferred to a
separatory funnel, settled, and the aqueous layer separated. The
organic layer was washed sequentially with a 10% aqueous solution
of sodium chloride (145 g), a 13% aqueous solution of phosphoric
acid (128 g), and a 10% aqueous solution of sodium chloride (144
g). The organic layer was transferred to a 1-L round bottom flask
and concentrated to approximately 120 mL. Acetonitrile (80 g) was
added and the solution distilled to approximately 120 mL. This
chase distillation was repeated two more times. To this solution at
40.degree. C. was added a solution of CDI (28.48 g, 173 mmol, 1.10
equiv.) over 1 h. The solution was cooled to 23.degree. C. and
concentrated to approximately 210 mL. To this solution at
40.degree. C. was added water (537 g) over 1 h. The slurry was
cooled to 23.degree. C. and stirred for 5 h. The slurry was
filtered and the wet cake washed twice with equal portions of a 20%
solution of aqueous acetonitrile (80 g). The wet cake was dried in
a vacuum oven at 45.degree. C. with a nitrogen sweep to give
4-(2-(3-chloroquinoxalin-2-yl)-2,2-difluoroethyl)-1,3-dioxolan-2-one,
compound 100 (47.16 g, 95.5% yield).
##STR00208##
[0276] To a flask was added
(4-(2-(3-chloroquinoxalin-2-yl)-2,2-difluoroethyl)-1,3-dioxolan-2-one),
compound 100, (60 g, 1.0 eq.) followed by THF (480 g). The mixture
was cooled to an internal temperature of -8.8.degree. C. To this
solution was added 193 mL of sodium hexamethyldisilazide (NaHMDS)
in THF (1.04 M, 1.05 eq.) drop wise keeping the temperature below
0.degree. C., forming the open carbonate compound 101.
[0277] To another flask was added
(2S,4R)-1-(tert-butoxycarbonyl)-4-hydroxypyrrolidine-2-carboxylic
acid, compound 21, (50.7 g, 1.15 eq.) followed by THF (473.5 g).
The solution was mixed for 10 min. Then solid KOtBu (49.2 g, 2.3
eq.) was added in portions maintaining the temperature below
40.degree. C. The resulting slurry was cooled below 30.degree. C.
and then water (1.72 g, 0.5 eq.) was added. The slurry was cooled
to an internal temperature of 10.degree. C. and then added to the
flask containing compound 101. The flask containing the slurry of
compound 21 was rinsed with 48 g of THF and the rinse was added to
the flask containing compound 101. The mixture was stirred for 2 h
at 0.degree. C., and then quenched with 150 g of water.
[0278] The quenched reaction mixture was stirred for 30 min while
warming to ambient temperature. The mixture was allowed to settle,
and then the lower aqueous layer (along with solids) was removed.
The solution was concentrated via rotovap to approximately 250 mL.
The thick oil was diluted with 432 g of water. The aqueous product
solution was extracted twice with isopropyl acetate (2.times.230
g). Then isopropyl acetate was added (270 g) to the aqueous product
solution and, while mixing, 32 g of 85% phosphoric acid were added.
After mixing, the bi-phasic solution was allowed to settle, the
layers were separated, and the upper product layer was retained.
The lower aqueous layer was extracted with an additional 270 g of
isopropyl acetate to recover additional product. The isopropyl
acetate layers were combined and then washed three times with 10%
aqueous sodium phosphate monobasic (3.times.380 g), and then once
with water (240 g). The product containing isopropyl acetate layer
was heated to 45.degree. C. and then treated with 4.5 g of
activated carbon. The solution was concentrated and chased with
isopropyl acetate to dry the solution. The product was crystallized
from isopropyl acetate by the addition of 30.7 g (0.88 eq.) of
benzhydrylamine, followed by cooling to 0.degree. C. The slurry was
filtered and washed with cold isopropyl acetate. The product was
dried under vacuum at 45.degree. C. overnight to yield 89.5 g of
compound 68 as the benzhydrylamine salt (72%).
##STR00209##
[0279] Compound 68 as the benzhydrylamine salt (23.4 g, 36 mmol)
was combined with cyclopentyl methyl ether (CPME, 180 mL) and water
(72 mL). Phosphoric acid (50 mL, 10%) was added and the contents
were mixed for 10 min. The CPME layer was separated and washed with
phosphoric acid (50 mL, 10%), then with water (50 mL) and
concentrated in vacuo to 40 g weight. The residue was diluted with
methanol (67 mL), cooled to 0.degree. C. and thionyl chloride (8.4
g, 72 mmol) was added slowly, maintaining the temperature below
15.degree. C. Mixing was continued for 15 h at ambient temperature.
Water (0.4 g) was added to the reaction mixture and mixing was
continued for 1 h. The mixture was then diluted with CPME (72 mL)
and concentrated in vacuo to .about.85 mL volume while maintaining
the internal temperature below 35.degree. C. The mixture was
re-diluted with CPME (72 mL) and concentrated in vacuo to .about.85
mL volume while maintaining the internal temperature below
35.degree. C. The product slurry was agitated at ambient
temperature and filtered. The filter cake was washed with CPME and
dried in vacuo at less than 40.degree. C. to give 14.2 g of
compound 69 as the HCl salt (95% yield).
INCORPORATION BY REFERENCE
[0280] The contents of all references (including literature
references, issued patents, published patent applications, and
co-pending patent applications) cited throughout this application
are hereby expressly incorporated herein in their entireties by
reference. Unless otherwise defined, all technical and scientific
terms used herein are accorded the meaning commonly known to one
with ordinary skill in the art.
EQUIVALENTS
[0281] Those skilled in the art will recognize, or be able to
ascertain using no more than routine experimentation, many
equivalents to the specific embodiments of the invention described
herein. Such equivalents are intended to be encompassed by the
following claims. The contents of all references, patents, and
published patent applications, and patent applications cited
throughout this application are incorporated herein by
reference.
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