U.S. patent application number 14/599341 was filed with the patent office on 2015-05-14 for compounds and uses thereof for the modulation of hemoglobin.
The applicant listed for this patent is Global Blood Therapeutics, Inc.. Invention is credited to Zhe LI, Qing XU.
Application Number | 20150133430 14/599341 |
Document ID | / |
Family ID | 51529929 |
Filed Date | 2015-05-14 |
United States Patent
Application |
20150133430 |
Kind Code |
A1 |
XU; Qing ; et al. |
May 14, 2015 |
COMPOUNDS AND USES THEREOF FOR THE MODULATION OF HEMOGLOBIN
Abstract
Provide herein are compounds and pharmaceutical compositions
suitable as modulators of hemoglobin, methods and intermediates for
their preparation, and methods for their use in treating disorders
mediated by hemoglobin and disorders that would benefit from tissue
and/or cellular oxygenation.
Inventors: |
XU; Qing; (South San
Francisco, CA) ; LI; Zhe; (South San Francisco,
CA) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Global Blood Therapeutics, Inc. |
South San Francisco |
CA |
US |
|
|
Family ID: |
51529929 |
Appl. No.: |
14/599341 |
Filed: |
January 16, 2015 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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13815735 |
Mar 15, 2013 |
8952171 |
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14599341 |
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Current U.S.
Class: |
514/210.18 ;
514/227.5; 514/237.5; 514/255.01; 514/330; 514/333; 514/343;
514/354; 514/422; 544/174; 544/389; 544/58.4; 546/226; 546/256;
546/279.1; 546/323; 548/524 |
Current CPC
Class: |
A61P 7/06 20180101; C07D
333/38 20130101; C07D 211/78 20130101; C07D 335/02 20130101; C07D
207/48 20130101; C07D 265/30 20130101; C07D 279/12 20130101; C07D
401/06 20130101; C07D 213/81 20130101; C07D 207/08 20130101; C07D
309/08 20130101; C07D 211/22 20130101; C07C 271/16 20130101; C07D
207/34 20130101; C07D 241/04 20130101; C07D 309/28 20130101; C07D
211/16 20130101; C07D 401/12 20130101; C07D 211/60 20130101; C07D
403/06 20130101 |
Class at
Publication: |
514/210.18 ;
546/323; 514/354; 546/279.1; 514/343; 546/256; 514/333; 546/226;
514/330; 548/524; 514/422; 544/174; 514/237.5; 544/389; 514/255.01;
544/58.4; 514/227.5 |
International
Class: |
C07D 401/12 20060101
C07D401/12; C07D 211/22 20060101 C07D211/22; C07D 279/12 20060101
C07D279/12; C07D 265/30 20060101 C07D265/30; C07D 241/04 20060101
C07D241/04; C07D 213/81 20060101 C07D213/81; C07D 207/08 20060101
C07D207/08 |
Claims
1. A compound of Formula (I): ##STR00065## or a tautomer thereof,
or pharmaceutically acceptable salt of each of thereof, wherein
R.sup.3 is C.sub.1-C.sub.6 alkyl, C.sub.3-C.sub.8 cycloalkyl,
C.sub.1-C.sub.6 alkoxy, C.sub.3-C.sub.8 cycloalkoxy, or
--NR.sup.1R.sup.2; each R.sup.1 and R.sup.2 independently is
hydrogen, C.sub.1-C.sub.6 alkyl, C.sub.3-C.sub.8 cycloalkyl,
C.sub.6-C.sub.10 aryl, 4-10 membered heterocycle or 5-10 membered
heteroaryl, each containing up to 5 ring heteroatoms, wherein the
heteroatom is selected from the group consisting of O, N, S, and
oxidized forms of N and S, wherein each alkyl, cycloalkyl,
heterocycle, aryl or heteroaryl is optionally substituted with 1-3
halo, C.sub.1-C.sub.6 alkyl, C.sub.1-C.sub.6 alkoxy, hydroxy, oxo,
wherein the C.sub.1-C.sub.6 alkyl is optionally substituted with
1-5 halo, or R.sup.1 and R.sup.2 together with the nitrogen atom
they are attached to form an optionally substituted 4-7 membered
heterocycle; L is a bond or is NR.sup.70, O, S, or
(CR.sup.71R.sup.72).sub.d; wherein each R.sup.70, R.sup.71, and
R.sup.72 independently are hydrogen or C.sub.1-C.sub.6 alkyl
provided that when L is NR.sup.70, R.sup.70 is hydrogen, R.sup.3 is
NR.sup.1R.sup.2, and one of R.sup.1 and R.sup.2 is hydrogen, then,
the other of R.sup.1 and R.sup.2 is not optionally substituted
C.sub.6-C.sub.10 aryl as defined above; d is 1, 2, or 3; ring B is
a C.sub.6-C.sub.10 aryl, 5-10 membered heteroaryl having 1-3
nitrogen atoms or oxidized forms of N, or 4-10 membered heterocycle
containing up to 5 ring heteroatoms, wherein the heteroatom is
selected from the group consisting of O, N, S, and oxidized forms
of N and S, wherein the aryl, heteroaryl, or heterocycle is
optionally substituted with 1-3 halo, C.sub.1-C.sub.6 alkyl
optionally substituted with 1-5 halo, C.sub.1-C.sub.6 alkoxy,
hydroxy, oxo COR.sup.15, and CO.sub.2R.sup.15; R.sup.15 is
C.sub.1-C.sub.6 alkyl, C.sub.6-C.sub.10 aryl, 5-10 membered
heteroaryl or a 4-10 membered heterocycle containing up to 5 ring
heteroatoms, wherein the heteroatom is selected from the group
consisting of O, N, S, and oxidized forms of N and S; R.sup.17 is
C.sub.1-C.sub.6 alkyl, C.sub.6-C.sub.10 aryl, 5-10 membered
heteroaryl or a 4-10 membered heterocycle containing up to 5 ring
heteroatoms, wherein the heteroatom is selected from the group
consisting of O, N, S, and oxidized forms of N and S; each Y and Z
is independently CR.sup.10R.sup.11, O, S, SO, SO.sub.2, or
NR.sup.12; each R.sup.10 and R.sup.11 independently is hydrogen or
C.sub.1-C.sub.3 alkyl optionally substituted with 1-3 halo, OH, or
C.sub.1-C.sub.6 alkoxy, or CR.sup.10R.sup.11 is C.dbd.O, provided
that if one of Y and Z is O, S, SO, or SO.sub.2, then the other is
not CO, and provided that Y and Z are not both heteroatoms or
oxidized forms thereof; wherein Y is .alpha. or .beta. substituted
relative to the -LCOR.sup.3; ring C is a C.sub.6-C.sub.10 aryl or
5-10 membered heteroaryl containing 1-3 nitrogen atoms, or an
oxidized form of N, wherein the aryl or heteroaryl is further
optionally substituted with 1-3 halo, C.sub.1-C.sub.6 alkyl,
C.sub.1-C.sub.6 alkoxy, hydroxy, wherein the C.sub.1-C.sub.6 alkyl
is optionally substituted with 1-5 halo; wherein Z and
--CV.sup.1V.sup.2H are joined to adjacent atoms on ring C; V.sup.1
and V.sup.2 independently are C.sub.1-C.sub.6 alkoxy; or V.sup.1
and V.sup.2 together with the carbon atom they are attached to form
a ring of formula: ##STR00066## wherein each V.sup.3 and V.sup.4
are independently O, S, or NH, provided that when one of V.sup.3
and V.sup.4 is S, the other is NH, and provided that V.sup.3 and
V.sup.4 are both not NH; q is 1 or 2; each V.sub.5 is independently
C.sub.1-C.sub.6 alkyl or CO.sub.2R.sup.60, where each R.sup.60
independently is C.sub.1-C.sub.6 alkyl or hydrogen; t is 0, 1, 2,
or 4; or CV.sup.1V.sup.2 is C.dbd.V, wherein V is O, NOR.sup.80, or
NNR.sup.81R.sup.82; R.sup.80 is optionally substituted
C.sub.1-C.sub.6 alkyl; R.sup.81 and R.sup.82 independently are
selected from the group consisting of hydrogen; optionally
substituted C.sub.1-C.sub.6 alkyl, COR.sup.83 and CO.sub.2R.sup.84;
R.sup.83 is hydrogen or optionally substituted C.sub.1-C.sub.6
alkyl; R.sup.84 is optionally substituted C.sub.1-C.sub.6 alkyl;
R.sup.4 is OH, halo, C.sub.1-C.sub.6 alkoxy, C.sub.3-C.sub.6
cycloalkoxy or O--R, where R is a prodrug moiety, wherein the
C.sub.1-C.sub.6 alkoxy is optionally substituted with 1-5 halo; and
R.sup.4 and CV.sup.1V.sup.2H are adjacent or ortho to each
other.
2. The compound of claim 1, wherein V.sup.1 and V.sup.2
independently are C.sub.1-C.sub.6 alkoxy; or V.sup.1 and V.sup.2
together with the carbon atom they are attached to form a ring of
formula: ##STR00067## wherein each V.sup.3 and V.sup.4 are
independently O, S, or NH, provided that when one of V.sup.3 and
V.sup.4 is S the other is NH, and provided that V.sup.3 and V.sup.4
are both not NH; q is 1 or 2; each V.sub.5 is independently
C.sub.1-C.sub.6 alkyl or CO.sub.2R.sup.60, where each R.sup.60
independently is C.sub.1-C.sub.6 alkyl or hydrogen; t is 0, 1, 2,
or 4; or CV.sup.1V.sup.2 is C.dbd.V, wherein V is O.
3. A compound of claim 1 of Formula (II): ##STR00068## wherein Y--Z
is --CH.sub.2O-- or --CH.sub.2CH.sub.2-- and the remaining
substituents are defined as in claim 1.
4. The compound of claim 3, wherein and R.sup.4 and --CHO are
joined to adjacent atoms on ring C.
5. The compound of claim 2, of Formula IIIA: ##STR00069## wherein
ring B is a optionally substituted C.sub.6-C.sub.10 aryl,
optionally substituted 5-10 membered heteroaryl having 1-3 nitrogen
atoms or oxidized forms of N; R.sup.5 is hydrogen, C.sub.1-C.sub.6
alkyl or a prodrug moiety R; R.sup.6 is halo, C.sub.1-C.sub.6
alkyl, C.sub.1-C.sub.6 alkoxy, wherein the C.sub.1-C.sub.6 alkyl is
optionally substituted with 1-5 halo; and p is 0, 1, 2, or 3.
6. The compound of claim 2, wherein the compound is of Formula
IIIB, IIIC, or IIID: ##STR00070## wherein ##STR00071## are
optionally substituted 4-10 membered heterocycle as defined in
claim 1; R.sup.5 is hydrogen, C.sub.1-C.sub.6 alkyl or a prodrug
moiety; R.sup.6 is halo, C.sub.1-C.sub.6 alkyl, C.sub.1-C.sub.6
alkoxy, wherein the C.sub.1-C.sub.6 alkyl is optionally substituted
with 1-5 halo; and p is 0, 1, 2, or 3.
7. The compound of claim 2, wherein ring B is substituted with 1-3:
halo, C.sub.1-C.sub.6 alkyl, COR.sup.15, or COOR.sup.15; and
R.sup.15 is C.sub.1-C.sub.6 alkyl, C.sub.6-C.sub.10 aryl, 5-10
membered heteroaryl or a 4-10 membered heterocycle containing up to
5 ring heteroatoms, wherein the heteroatom is selected from the
group consisting of O, N, S, and oxidized forms of N and S, wherein
the alkyl, aryl, heteroaryl or heterocyclyl is optionally
substituted.
8. (canceled)
9. A compound of formula: ##STR00072## ##STR00073## ##STR00074## or
an N oxide thereof, or a pharmaceutically acceptable salt of each
thereof.
10. A composition comprising a compound of claim 2 and at least one
pharmaceutically acceptable excipient.
11. A method for increasing oxygen affinity of hemoglobin S in a
subject, the method comprising administering to a subject in need
thereof a therapeutically effective amount of a compound of claim
2.
12. A method for treating oxygen deficiency associated with sickle
cell anemia or acute respiratory distress syndrome, the method
comprising administering to a subject in need thereof a
therapeutically effective amount of a compound of claim 2.
13. A composition comprising a compound of claim 9 and at least one
pharmaceutically acceptable excipient.
14. A method for increasing oxygen affinity of hemoglobin S in a
subject, the method comprising administering to a subject in need
thereof a therapeutically effective amount of a compound of claim
9.
15. A method for treating oxygen deficiency associated with sickle
cell anemia or acute respiratory distress syndrome, the method
comprising administering to a subject in need thereof a
therapeutically effective amount of a compound of claim 9.
16. A method for increasing oxygen affinity of hemoglobin S in a
subject, the method comprising administering to a subject in need
thereof a therapeutically effective amount of a composition of
claim 13.
17. A method for treating oxygen deficiency associated with sickle
cell anemia or acute respiratory distress syndrome, the method
comprising administering to a subject in need thereof a
therapeutically effective amount of a composition of claim 13.
Description
FIELD OF THE INVENTION
[0001] This invention provides compounds and pharmaceutical
compositions suitable as allosteric modulators of hemoglobin,
methods and intermediates for their preparation, and methods for
their use in treating disorders mediated by hemoglobin and
disorders that would benefit from tissue and/or cellular
oxygenation.
STATE OF THE ART
[0002] Sickle cell disease is a disorder of the red blood cells,
found particularly among those of African and Mediterranean
descent. The basis for sickle cell disease is found in sickle
hemoglobin (HbS), which contains a point mutation relative to the
prevalent peptide sequence of hemoglobin (Hb).
[0003] Hemoglobin (Hb) transports oxygen molecules from the lungs
to various tissues and organs throughout the body. Hemoglobin binds
and releases oxygen through conformational changes. Sickle
hemoglobin (HbS) contains a point mutation where glutamic acid is
replaced with valine, allowing HbS to become susceptible to
polymerization to give the HbS containing red blood cells their
characteristic sickle shape. The sickled cells are also more rigid
than normal red blood cells, and their lack of flexibility can lead
to blockage of blood vessels. U.S. Pat. No. 7,160,910 discloses
compounds that are allosteric modulators of hemoglobin. However, a
need exists for additional therapeutics that can treat disorders
that are mediated by Hb or by abnormal Hb such as HbS.
SUMMARY OF THE INVENTION
[0004] This invention relates generally to compounds and
pharmaceutical compositions suitable as allosteric modulators of
hemoglobin. In some aspects, this invention relates to methods for
treating disorders mediated by hemoglobin and disorders that would
benefit from tissue and/or cellular oxygenation.
[0005] In certain aspects of the invention, a compound of Formula
(I) is provided:
##STR00001## [0006] or a tautomer thereof, or pharmaceutically
acceptable salt of each of thereof, wherein R.sup.3 is
C.sub.1-C.sub.6 alkyl, C.sub.3-C.sub.8 cycloalkyl, C.sub.1-C.sub.6
alkoxy, C.sub.3-C.sub.8 cycloalkoxy, or --NR.sup.1R.sup.2; [0007]
each R.sup.1 and R.sup.2 independently is hydrogen, C.sub.1-C.sub.6
alkyl, C.sub.3-C.sub.8 cycloalkyl, C.sub.6-C.sub.10 aryl, 4-10
membered heterocycle or 5-10 membered heteroaryl, each containing
up to 5 ring heteroatoms, wherein the heteroatom is selected from
the group consisting of O, N, S, and oxidized forms of N and S,
wherein each alkyl, cycloalkyl, heterocycle, aryl or heteroaryl is
optionally substituted, or R.sup.1 and R.sup.2 together with the
nitrogen atom they are attached to form an optionally substituted
4-7 membered heterocycle; [0008] L is a bond or is NR.sup.70, O, S,
or (CR.sup.71R.sup.72).sub.d; wherein each R.sup.70, R.sup.71, and
R.sup.72 independently are hydrogen or C.sub.1-C.sub.6 alkyl;
[0009] d is 1, 2, or 3; [0010] ring B is a optionally substituted
C.sub.6-C.sub.10 aryl, optionally substituted 5-10 membered
heteroaryl having 1-3 nitrogen atoms or oxidized forms of N, or
optionally substituted 4-10 membered heterocycle containing up to 5
ring heteroatoms, wherein the heteroatom is selected from the group
consisting of O, N, S, and oxidized forms of N and S; [0011] each Y
and Z is independently CR.sup.10R.sup.11, O, S, SO, SO.sub.2, or
NR.sup.12; each R.sup.10 and R.sup.11 independently is hydrogen or
C.sub.1-C.sub.3 alkyl optionally substituted with 1-3 halo, OH, or
C.sub.1-C.sub.6 alkoxy, or CR.sup.10R.sup.11 is C.dbd.O, provided
that if one of Y and Z is O, S, SO, SO.sub.2, then the other is not
CO, and Y and Z are both not heteroatoms or oxidized forms thereof;
[0012] wherein Y is a or 13 substituted relative to the
-LCOR.sup.3; [0013] ring C is a optionally substituted
C.sub.6-C.sub.10 aryl or optionally substituted 5-10 membered
heteroaryl containing 1-3 nitrogen atoms, or an oxidized form of N;
[0014] wherein Z and --CV.sup.1V.sup.2H are joined to adjacent
atoms on ring C; [0015] V.sup.1 and V.sup.2 independently are
C.sub.1-C.sub.6 alkoxy; or V.sup.1 and V.sup.2 together with the
carbon atom they are attached to form a ring of formula:
[0015] ##STR00002## [0016] wherein each V.sup.3 and V.sup.4 are
independently O, S, or NH, provided that when one of V.sup.3 and
V.sup.4 is S, the other is NH, and provided that V.sup.3 and
V.sup.4 are both not NH; q is 1 or 2; each V.sub.5 is independently
C.sub.1-C.sub.6 alkyl or CO.sub.2R.sup.60, where each R.sup.60
independently is C.sub.1-C.sub.6 alkyl or hydrogen; t is 0, 1, 2,
or 4; or CV.sup.1V.sup.2 is C.dbd.V, wherein V is O, NOR.sup.80, or
NNR.sup.81R.sup.82; [0017] R.sup.4 is OH, halo, C.sub.1-C.sub.6
alkoxy, C.sub.3-C.sub.6 cycloalkoxy or O--R, where R is a prodrug
moiety, wherein the C.sub.1-C.sub.6 alkoxy is optionally
substituted with 1-5 halo; [0018] R.sup.80 is optionally
substituted C.sub.1-C.sub.6 alkyl; [0019] R.sup.81 and R.sup.82
independently are selected from the group consisting of hydrogen;
[0020] optionally substituted C.sub.1-C.sub.6 alkyl, COR.sup.83 and
CO.sub.2R.sup.84; [0021] R.sup.83 is hydrogen or optionally
substituted C.sub.1-C.sub.6 alkyl; and [0022] R.sup.84 is
optionally substituted C.sub.1-C.sub.6 alkyl.
[0023] In further aspects of the invention, a composition is
provided comprising any of the compounds described herein, and at
least a pharmaceutically acceptable excipient.
[0024] In still further aspects of the invention, a method is
provided for increasing oxygen affinity of hemoglobin S in a
subject, the method comprising administering to a subject in need
thereof a therapeutically effective amount of any of the compounds
or compositions described herein.
[0025] In further aspects of the invention, a method is provided
for treating oxygen deficiency associated with sickle cell anemia,
the method comprising administering to a subject in need thereof a
therapeutically effective amount of any of the compounds or
compositions described herein.
DETAILED DESCRIPTION OF THE INVENTION
Definitions
[0026] It must be noted that as used herein and in the appended
claims, the singular forms "a", "an", and "the" include plural
referents unless the context clearly dictates otherwise. Thus, for
example, reference to "a solvent" includes a plurality of such
solvents.
[0027] As used herein, the term "comprising" or "comprises" is
intended to mean that the compositions and methods include the
recited elements, but not excluding others. "Consisting essentially
of" when used to define compositions and methods, shall mean
excluding other elements of any essential significance to the
combination for the stated purpose. Thus, a composition or process
consisting essentially of the elements as defined herein would not
exclude other materials or steps that do not materially affect the
basic and novel characteristic(s) of the claimed invention.
"Consisting of" shall mean excluding more than trace elements of
other ingredients and substantial method steps. Embodiments defined
by each of these transition terms are within the scope of this
invention.
[0028] Unless otherwise indicated, all numbers expressing
quantities of ingredients, reaction conditions, and so forth used
in the specification and claims are to be understood as being
modified in all instances by the term "about." Accordingly, unless
indicated to the contrary, the numerical parameters set forth in
the following specification and attached claims are approximations.
Each numerical parameter should at least be construed in light of
the number of reported significant digits and by applying ordinary
rounding techniques. The term "about" when used before a numerical
designation, e.g., temperature, time, amount, and concentration,
including range, indicates approximations which may vary by (+) or
(-) 10%, 5% or 1%.
[0029] As used herein, C.sub.m-C.sub.n, such as C.sub.1-C.sub.12,
C.sub.1-C.sub.8, or C.sub.1-C.sub.6 when used before a group refers
to that group containing m to n carbon atoms.
[0030] The term "alkoxy" refers to --O-alkyl. Cycloalkoxy refers to
--O-cycloalkyl.
[0031] The term "alkyl" refers to monovalent saturated aliphatic
hydrocarbyl groups having from 1 to 30 carbon atoms (i.e.,
C.sub.1-C.sub.30 alkyl) or 1 to 22 carbon atoms (i.e.,
C.sub.1-C.sub.22 alkyl), 1 to 8 carbon atoms (i.e., C.sub.1-C.sub.8
alkyl), or 1 to 4 carbon atoms. This term includes, by way of
example, linear and branched hydrocarbyl groups such as methyl
(CH.sub.3--), ethyl (CH.sub.3CH.sub.2--), n-propyl
(CH.sub.3CH.sub.2CH.sub.2--), isopropyl ((CH.sub.3).sub.2CH--),
n-butyl (CH.sub.3CH.sub.2CH.sub.2CH.sub.2--), isobutyl
((CH.sub.3).sub.2CHCH.sub.2--), sec-butyl
((CH.sub.3)(CH.sub.3CH.sub.2)CH--), t-butyl ((CH.sub.3).sub.3C--),
n-pentyl (CH.sub.3CH.sub.2CH.sub.2CH.sub.2CH.sub.2--), and
neopentyl ((CH.sub.3).sub.3CCH.sub.2--).
[0032] The term "aryl" refers to a monovalent, aromatic mono- or
bicyclic ring having 6-10 ring carbon atoms. Examples of aryl
include phenyl and naphthyl. The condensed ring may or may not be
aromatic provided that the point of attachment is at an aromatic
carbon atom. For example, and without limitation, the following is
an aryl group:
##STR00003##
[0033] The term "--CO.sub.2H ester" refers to an ester formed
between the --CO.sub.2H group and an alcohol, preferably an
aliphatic alcohol. A preferred example included --CO.sub.2R.sup.E,
wherein R.sup.E is alkyl or aryl group optionally substituted with
an amino group.
[0034] The term "chiral moiety" refers to a moiety that is chiral.
Such a moiety can possess one or more asymmetric centers.
Preferably, the chiral moiety is enantiomerically enriched, and
more preferably a single enantiomer. Non limiting examples of
chiral moieties include chiral carboxylic acids, chiral amines,
chiral amino acids, such as the naturally occurring amino acids,
chiral alcohols including chiral steroids, and the likes.
[0035] The term "cycloalkyl" refers to a monovalent, preferably
saturated, hydrocarbyl mono-, bi-, or tricyclic ring having 3-12
ring carbon atoms. While cycloalkyl, refers preferably to saturated
hydrocarbyl rings, as used herein, it also includes rings
containing 1-2 carbon-carbon double bonds. Nonlimiting examples of
cycloalkyl include cyclopropyl, cyclobutyl, cyclopentyl,
cyclohexyl, cycloheptyl, adamentyl, and the like. The condensed
rings may or may not be non-aromatic hydrocarbyl rings provided
that the point of attachment is at a cycloalkyl carbon atom. For
example, and without limitation, the following is a cycloalkyl
group:
##STR00004##
[0036] The term "halo" refers to F, Cl, Br, and/or I.
[0037] The term "heteroaryl" refers to a monovalent, aromatic
mono-, bi-, or tricyclic ring having 2-16 ring carbon atoms and 1-8
ring heteroatoms selected preferably from N, O, S, and P and
oxidized forms of N, S, and P, provided that the ring contains at
least 5 ring atoms. Nonlimiting examples of heteroaryl include
furan, imidazole, oxadiazole, oxazole, pyridine, quinoline, and the
like. The condensed rings may or may not be a heteroatom containing
aromatic ring provided that the point of attachment is a heteroaryl
atom. For example, and without limitation, the following is a
heteroaryl group:
##STR00005##
[0038] The term "heterocyclyl" or heterocycle refers to a
non-aromatic, mono-, bi-, or tricyclic ring containing 2-12 ring
carbon atoms and 1-8 ring heteroatoms selected preferably from N,
0, S, and P and oxidized forms of N, S, and P, provided that the
ring contains at least 3 ring atoms. While heterocyclyl preferably
refers to saturated ring systems, it also includes ring systems
containing 1-3 double bonds, provided that the ring is
non-aromatic. Nonlimiting examples of heterocyclyl include,
azalactones, oxazoline, piperidinyl, piperazinyl, pyrrolidinyl,
tetrahydrofuranyl, and tetrahydropyranyl. The condensed rings may
or may not contain a non-aromatic heteroatom containing ring
provided that the point of attachment is a heterocyclyl group. For
example, and without limitation, the following is a heterocyclyl
group:
##STR00006##
[0039] The term "hydrolyzing" refers to breaking an
R.sup.H--O--CO--, R.sup.H--O--CS--, or an
R.sup.H--O--SO.sub.2-moiety to an R.sup.H--OH, preferably by adding
water across the broken bond. A hydrolyzing is performed using
various methods well known to the skilled artisan, non limiting
examples of which include acidic and basic hydrolysis.
[0040] The term "oxo" refers to a C.dbd.O group, and to a
substitution of 2 geminal hydrogen atoms with a C.dbd.O group.
[0041] The term "optionally substituted" refers to a substituted or
unsubstituted group. The group may be substituted with one or more
substituents, such as e.g., 1, 2, 3, 4 or 5 substituents.
Preferably, the substituents are selected from the group consisting
of oxo, halo, --CN, NO.sub.2, --N.sub.2+, --CO.sub.2R.sup.100,
--OR.sup.100, --SR.sup.100, --SOR.sup.100, --SO.sub.2R.sup.100,
--NR.sup.101R.sup.102; --CONR.sup.101R.sup.102,
--SO.sub.2NR.sup.101R.sup.102, C.sub.1-C.sub.6 alkyl,
C.sub.1-C.sub.6 alkoxy, --CR.sup.100--C(R.sup.100).sub.2,
--CCR.sup.100, C.sub.3-C.sub.10cycloalkyl, C.sub.3-C.sub.10
heterocyclyl, C.sub.6-C.sub.12aryl and C.sub.2-C.sub.12heteroaryl,
wherein each R.sup.100 independently is hydrogen or C.sub.1-C.sub.8
alkyl; C.sub.3-C.sub.12 cycloalkyl; C.sub.3-C.sub.10 heterocyclyl;
C.sub.6-C.sub.12 aryl; or C.sub.2-C.sub.12 heteroaryl; wherein each
alkyl, cycloalkyl, heterocyclyl, aryl, or heteroaryl is optionally
substituted with 1-3 halo, 1-3 C.sub.1-C.sub.6 alkyl, 1-3
C.sub.1-C.sub.6 haloalkyl or 1-3 C.sub.1-C.sub.6 alkoxy groups.
Preferably, the substituents are selected from the group consisting
of chloro, fluoro, --OCH.sub.3, methyl, ethyl, iso-propyl,
cyclopropyl, vinyl, ethynyl, --CO.sub.2H, --CO.sub.2CH.sub.3,
--OCF.sub.3, --CF.sub.3 and --OCHF.sub.2.
[0042] R.sup.101 and R.sup.102 independently is hydrogen;
C.sub.1-C.sub.8 alkyl, optionally substituted with --CO.sub.2H or
an ester thereof, C.sub.1-C.sub.6 alkoxy, oxo,
--CR.sup.103.dbd.C(R.sup.103).sub.2, --CCR, C.sub.3-C.sub.10
cycloalkyl, C.sub.3-C.sub.10 heterocyclyl, C.sub.6-C.sub.12aryl, or
C.sub.2-C.sub.12heteroaryl, wherein each R.sup.103 independently is
hydrogen or C.sub.1-C.sub.8 alkyl; C.sub.3-C.sub.12 cycloalkyl;
C.sub.3-C.sub.10 heterocyclyl; C.sub.6-C.sub.12aryl; or
C.sub.2-C.sub.12heteroaryl; wherein each cycloalkyl, heterocyclyl,
aryl, or heteroaryl is optionally substituted with 1-3 alkyl groups
or 1-3 halo groups, or R.sup.101 and R.sup.102 together with the
nitrogen atom they are attached to form a 5-7 membered
heterocycle.
[0043] The term "pharmaceutically acceptable" refers to safe and
non-toxic for in vivo, preferably, human administration.
[0044] The term "pharmaceutically acceptable salt" refers to a salt
that is pharmaceutically acceptable.
[0045] The term "salt" refers to an ionic compound formed between
an acid and a base. When the compound provided herein contains an
acidic functionality, such salts include, without limitation,
alkali metal, alkaline earth metal, and ammonium salts. As used
herein, ammonium salts include, salts containing protonated
nitrogen bases and alkylated nitrogen bases. Exemplary, and
non-limiting cations useful in pharmaceutically acceptable salts
include Na, K, Rb, Cs, NH.sub.4, Ca, Ba, imidazolium, and ammonium
cations based on naturally occurring amino acids. When the
compounds utilized herein contain basic functionality, such salts
include, without limitation, salts of organic acids, such as
carboxylic acids and sulfonic acids, and mineral acids, such as
hydrogen halides, sulfuric acid, phosphoric acid, and the likes.
Exemplary and non-limiting anions useful in pharmaceutically
acceptable salts include oxalate, maleate, acetate, propionate,
succinate, tartrate, chloride, sulfate, bisalfate, mono-, di-, and
tribasic phosphate, mesylate, tosylate, and the likes.
[0046] The terms "treat", "treating" or "treatment", as used
herein, include alleviating, abating or ameliorating a disease or
condition or one or more symptoms thereof, preventing additional
symptoms, ameliorating or preventing the underlying metabolic
causes of symptoms, inhibiting the disease or condition, e.g.,
arresting or suppressing the development of the disease or
condition, relieving the disease or condition, causing regression
of the disease or condition, relieving a condition caused by the
disease or condition, or suppressing the symptoms of the disease or
condition, and are intended to include prophylaxis. The terms also
include relieving the disease or conditions, e.g., causing the
regression of clinical symptoms. The terms further include
achieving a therapeutic benefit and/or a prophylactic benefit. By
therapeutic benefit is meant eradication or amelioration of the
underlying disorder being treated. Also, a therapeutic benefit is
achieved with the eradication or amelioration of one or more of the
physiological symptoms associated with the underlying disorder such
that an improvement is observed in the individual, notwithstanding
that the individual is still be afflicted with the underlying
disorder. For prophylactic benefit, the compositions are
administered to an individual at risk of developing a particular
disease, or to an individual reporting one or more of the
physiological symptoms of a disease, even though a diagnosis of
this disease has not been made.
[0047] The terms "preventing" or "prevention" refer to a reduction
in risk of acquiring a disease or disorder (i.e., causing at least
one of the clinical symptoms of the disease not to develop in a
subject that may be exposed to or predisposed to the disease but
does not yet experience or display symptoms of the disease). The
terms further include causing the clinical symptoms not to develop,
for example in a subject at risk of suffering from such a disease
or disorder, thereby substantially averting onset of the disease or
disorder.
[0048] The term "effective amount" refers to an amount that is
effective for the treatment of a condition or disorder by an
intranasal administration of a compound or composition described
herein. In some embodiments, an effective amount of any of the
compositions or dosage forms described herein is the amount used to
treat a disorder mediated by hemoglobin or a disorder that would
benefit from tissue and/or cellular oxygenation of any of the
compositions or dosage forms described herein to a subject in need
thereof.
[0049] The term "carrier" as used herein, refers to relatively
nontoxic chemical compounds or agents that facilitate the
incorporation of a compound into cells, e.g., red blood cells, or
tissues.
[0050] As used herein, a "prodrug" is a compound that, after
administration, is metabolized or otherwise converted to an active
or more active form with respect to at least one property. To
produce a prodrug, a pharmaceutically active compound can be
modified chemically to render it less active or inactive, but the
chemical modification is such that an active form of the compound
is generated by metabolic or other biological processes. A prodrug
may have, relative to the drug, altered metabolic stability or
transport characteristics, fewer side effects or lower toxicity.
For example, see the reference Nogrady, 1985, Medicinal Chemistry A
Biochemical Approach, Oxford University Press, New York, pages
388-392. Prodrugs can also be prepared using compounds that are not
drugs.
Compounds
[0051] In certain aspects of the invention, a compound of Formula
(I) is provided:
##STR00007##
[0052] or a tautomer thereof, or pharmaceutically acceptable salt
of each of thereof or a pharmaceutically acceptable salt thereof,
wherein [0053] R.sup.3 is C.sub.1-C.sub.6 alkyl, C.sub.3-C.sub.8
cycloalkyl, C.sub.1-C.sub.6 alkoxy, C.sub.3-C.sub.8 cycloalkoxy, or
--NR.sup.1R.sup.2; [0054] each R.sup.1 and R.sup.2 independently is
hydrogen, C.sub.1-C.sub.6 alkyl, C.sub.3-C.sub.8 cycloalkyl,
C.sub.6-C.sub.10aryl, 4-10 membered heterocycle or 5-10 membered
heteroaryl, each containing up to 5 ring heteroatoms, wherein the
heteroatom is selected from the group consisting of O, N, S, and
oxidized forms of N and S, wherein each alkyl, cycloalkyl,
heterocycle, aryl or heteroaryl is optionally substituted, or
R.sup.1 and R.sup.2 together with the nitrogen atom they are
attached to form an optionally substituted 4-7 membered
heterocycle; [0055] L is a bond or is NR.sup.70, O, S, or
(CR.sup.71R.sup.72).sub.d; wherein each R.sup.70, R.sup.71, and
R.sup.72 independently are hydrogen or C.sub.1-C.sub.6 alkyl;
[0056] d is 1, 2, or 3; [0057] ring B is a optionally substituted
C.sub.6-C.sub.10 aryl, optionally substituted 5-10 membered
heteroaryl having 1-3 nitrogen atoms or oxidized forms of N, or
optionally substituted 4-10 membered heterocycle containing up to 5
ring heteroatoms, wherein the heteroatom is selected from the group
consisting of O, N, S, and oxidized forms of N and S; [0058] each Y
and Z is independently CR.sup.10R.sup.11; O, S, SO, SO.sub.2, or
NR.sup.12; each R.sup.10 and R.sup.11 independently is hydrogen or
C.sub.1-C.sub.3 alkyl optionally substituted with 1-3 halo, OH, or
C.sub.1-C.sub.5 alkoxy, or CR.sup.10R.sup.11 is C.dbd.O, provided
that if one of Y and Z is O, S, SO, SO.sub.2, then the other is not
CO, and Y and Z are both not heteroatoms or oxidized forms thereof;
[0059] wherein Y is .alpha. or .beta. substituted relative to the
-LCOR.sup.3; [0060] ring C is a optionally substituted
C.sub.6-C.sub.10 aryl or optionally substituted 5-10 membered
heteroaryl containing 1-3 nitrogen atoms, or an oxidized form of N;
[0061] wherein Z and --CV.sup.1V.sup.2H are joined to adjacent
atoms on ring C; [0062] V.sup.1 and V.sup.2 independently are
C.sub.1-C.sub.6 alkoxy; or V.sup.1 and V.sup.2 together with the
carbon atom they are attached to form a ring of formula:
[0062] ##STR00008## [0063] wherein each V.sup.3 and V.sup.4 are
independently O, S, or NH, provided that when one of V.sup.3 and
V.sup.4 is S, the other is NH, and provided that V.sup.3 and
V.sup.4 are both not NH; q is 1 or 2; each V.sub.5 is independently
C.sub.1-C.sub.6 alkyl or CO.sub.2R.sup.60, where each R.sup.60
independently is C.sub.1-C.sub.6 alkyl or hydrogen; t is 0, 1, 2,
or 4; or CV.sup.1V.sup.2 is C.dbd.V, wherein V is O, NOR.sup.80, or
NNR.sup.81R.sup.82; [0064] R.sup.4 is OH, halo, C.sub.1-C.sub.6
alkoxy, C.sub.3-C.sub.6 cycloalkoxy or O--R, where R is a prodrug
moiety, wherein the C.sub.1-C.sub.6 alkoxy is optionally
substituted with 1-5 halo; [0065] R.sup.80 is optionally
substituted C.sub.1-C.sub.6 alkyl; [0066] R.sup.81 and R.sup.82
independently are selected from the group consisting of hydrogen;
[0067] optionally substituted C.sub.1-C.sub.6 alkyl, COR.sup.83 and
CO.sub.2R.sup.84; [0068] R.sup.83 is hydrogen or optionally
substituted C.sub.1-C.sub.6 alkyl; and [0069] R.sup.84 is
optionally substituted C.sub.1-C.sub.6 alkyl.
[0070] In certain embodiments, t is 0. In certain embodiments, t is
1. In certain embodiments, t is 2. In certain embodiments, t is
3.
[0071] Preferably, in certain embodiments, Y and Z are both not a
heteroatom or a heteroatom containing moiety. Preferably, one of Y
and Z is a methylene or substituted methylene and the other is a
heteroatom or a heteroatom containing moiety. More preferably, Y is
an alkylene, and Z is a heteroatom or a heteroatom containing
moiety, which, yet more preferably is oxygen.
[0072] Preferably, V.sup.1 and V.sup.2 together with the carbon
atom they are attached to form a ring of formula:
##STR00009##
[0073] In some embodiments, V.sup.1 and V.sup.2 independently are
C.sub.1-C.sub.6 alkoxy; or V.sup.1 and V.sup.2 together with the
carbon atom they are attached to form a ring of formula:
##STR00010##
wherein each V.sup.3 and V.sup.4 are independently O, S, or NH,
provided that when one or V.sup.3 and V.sup.4 is S the other is NH,
and provided that V.sup.3 and V.sup.4 are both not NH; q is 1 or 2;
each V.sub.5 is independently C.sub.1-C.sub.6 alkyl or
CO.sub.2R.sup.60, where each R.sup.60 independently is
C.sub.1-C.sub.6 alkyl or hydrogen; t is 0, 1, 2, or 4; or
CV.sup.1V.sup.2 is C.dbd.V, wherein V is O.
[0074] In certain aspects of the invention, the compound of Formula
(I) is of Formula (II):
##STR00011##
[0075] wherein Y--Z is --CH.sub.2O-- or --CH.sub.2CH.sub.2-- and
the remaining substituents are as defined herein.
[0076] In some embodiments, R.sup.4 and --CHO are joined to
adjacent atoms on ring C.
[0077] In certain aspects of the invention, the compound of Formula
(I) is of Formula (IIIA):
##STR00012## [0078] wherein ring B is a optionally substituted
C.sub.6-C.sub.10 aryl, optionally substituted 5-10 membered
heteroaryl having 1-3 nitrogen atoms or oxidized forms of N; [0079]
R.sup.5 is hydrogen, C.sub.1-C.sub.6 alkyl or a prodrug moiety R;
and [0080] R.sup.6 is halo, C.sub.1-C.sub.6 alkyl, C.sub.3-C.sub.6
cycloalkyl, C.sub.1-C.sub.6 alkoxy, C.sub.3-C.sub.6 cycloalkoxy,
wherein the C.sub.1-C.sub.6 alkyl is optionally substituted with
1-5 halo.
[0081] In some embodiments, the compound is of Formula IIIB, IIIC,
or IIID:
##STR00013## [0082] wherein
[0082] ##STR00014## [0083] are optionally substituted 4-10 membered
heterocycle as defined herein; [0084] R.sup.5 is hydrogen,
C.sub.1-C.sub.6 alkyl or a prodrug moiety; and [0085] R.sup.6 is
halo, C.sub.1-C.sub.6 alkyl, C.sub.1-C.sub.6 alkoxy, wherein the
C.sub.1-C.sub.6 alkyl is optionally substituted with 1-5 halo.
[0086] In some embodiments, ring B is substituted with 1-3: halo,
C.sub.1-C.sub.6 alkyl, COR.sup.15, or COOR.sup.15; and [0087]
R.sup.15 is C.sub.1-C.sub.6 alkyl, C.sub.3-C.sub.6 cycloalkyl,
C.sub.6-C.sub.10 aryl, 5-10 membered heteroaryl or a 4-10 membered
heterocycle containing up to 5 ring heteroatoms, wherein the
heteroatom is selected from the group consisting of O, N, S, and
oxidized forms of N and S, wherein the alkyl, aryl, heteroaryl or
heterocyclyl is optionally substituted.
[0088] In some embodiments, the compound is selected from the group
consisting of
##STR00015## ##STR00016##
or an N oxide thereof, wherein [0089] is a single or a double bond;
[0090] each P and Q is independently selected from CHR.sup.17,
NCOR.sup.15, NCO.sub.2R.sup.15; N--O, O, S, SO, and SO.sub.2;
[0091] each R.sup.1 and R.sup.2 independently is hydrogen,
C.sub.1-C.sub.6 alkyl, a C.sub.6-C.sub.10 aryl, 5-10 membered
heteroaryl or a 4-10 membered heterocycle containing up to 5 ring
heteroatoms, wherein the heteroatom is selected from the group
consisting of O, N, S, and oxidized forms of N and S, wherein the
alkyl, aryl, heteroaryl or heterocyclyl is optionally substituted,
together R.sup.1 and R.sup.2 can form a 3-7 membered ring,
preferably a 4-7 membered ring with 1-2 hetero atoms; [0092]
R.sup.15 is C.sub.1-C.sub.6 alkyl, C.sub.6-C.sub.10 aryl, 5-10
membered heteroaryl or a 4-10 membered heterocycle containing up to
5 ring heteroatoms, wherein the heteroatom is selected from the
group consisting of O, N, S, and oxidized forms of N and S, wherein
the alkyl, aryl, heteroaryl or heterocyclyl is optionally
substituted; [0093] R.sup.17 is C.sub.1-C.sub.6 alkyl,
C.sub.6-C.sub.10 aryl, 5-10 membered heteroaryl or a 4-10 membered
heterocycle containing up to 5 ring heteroatoms, wherein the
heteroatom is selected from the group consisting of O, N, S, and
oxidized forms of N and S, wherein the alkyl, aryl, heteroaryl or
heterocyclyl is optionally substituted; [0094] and r is 0, 1, or
2.
[0095] In certain aspects of the invention, a compound is provided
of formula:
##STR00017## ##STR00018## ##STR00019##
or an N oxide thereof, or a pharmaceutically acceptable salt of
each thereof.
Prodrug Moiety
[0096] In one aspect, R is hydrogen, a phosphate or a diphosphate
containing moiety, or another promoiety or prodrug moiety.
Preferably the prodrug moiety imparts at least a 2 fold, more
preferably a 4 fold, enhanced solubility and/or bioavailability to
the active moiety (where R is hydrogen), and more preferably is
hydrolyzed in vivo. The promoieties are structurally and
functionally defined herein.
[0097] In one embodiments, R is --COR.sup.90, CO.sub.2R.sup.91, or
CONR.sup.92R.sup.93 wherein
R.sup.90 and R.sup.91 independently are C.sub.1-C.sub.6 alkyl,
C.sub.3-C.sub.8 cycloalkyl, 4-9 membered heterocycle, or a 5-10
membered heteroaryl, each containing at least 1 basic nitrogen
moiety; and R.sup.92 and R.sup.93 independently are C.sub.1-C.sub.6
alkyl; C.sub.3-C.sub.8 cycloalkyl, 4-9 membered heterocycle, or a
5-10 membered heteroaryl, each containing at least 1 basic nitrogen
moiety; or R.sup.92 and R.sup.93 together with the nitrogen atom
they are bonded to for a 4-9 member heterocycle substituted with at
least 1 amino, C.sub.1-C.sub.6 alkyl amino, or di C.sub.1-C.sub.6
alkylamino group.
[0098] In certain embodiments, R is --C(O)R.sup.31, C(O)OR.sup.31,
or CON(R.sup.13).sub.2,
[0099] each R.sup.31 is independently a C.sub.1-C.sub.6 alkyl;
C.sub.3-C.sub.8 cycloalkyl, 4-9 membered heterocycle, or a 5-10
membered heteroaryl, containing at least 1 basic nitrogen moiety;
and
[0100] each R.sup.13 independently is C.sub.1-C.sub.6 alkyl;
C.sub.3-C.sub.8 cycloalkyl, 4-9 membered heterocycle, or a 5-10
membered heteroaryl, containing at least 1 basic nitrogen moiety;
or 2 R.sup.13 together with the nitrogen atom they are bonded to
for a 4-9 member heterocycle substituted with at least 1 amino,
C.sub.1-C.sub.6 alkyl amino, or di C.sub.1-C.sub.6 alkylamino
group.
[0101] Preferably, R.sup.1 is isopropyl.
[0102] In one aspect, R is C(O)OR.sup.31, C(S)OR.sup.31,
C(O)SR.sup.31 or COR.sup.31, wherein R.sup.31 is as defined
herein.
[0103] In one embodiment, R.sup.31 is a group of the formula
(CR.sup.32R.sup.33).sub.eNR.sup.34R.sup.35, wherein
[0104] each R.sup.32 and R.sup.33 is independently H, a
C.sub.1-C.sub.8 alkyl, C.sub.3-C.sub.9 heterocyclyl,
C.sub.3-C.sub.8 cycloalkyl, C.sub.6-C.sub.10 aryl, C.sub.3-C.sub.9
heteroaryl or R.sup.32 and R.sup.33 together with the carbon atom
they are bond to form a C.sub.3-C.sub.8 cycloalkyl,
C.sub.6-C.sub.10 aryl, C.sub.3-C.sub.9 heterocyclyl or
C.sub.3-C.sub.9 heteroaryl ring system, or 2 adjacent R.sup.32
moieties or 2 adjacent R.sup.33 moieties together with the carbon
atom they are bond to form a C.sub.3-C.sub.8 cycloalkyl,
C.sub.6-C.sub.10 aryl, C.sub.3-C.sub.9 heterocyclyl or
C.sub.3-C.sub.9 heteroaryl ring system;
[0105] each R.sup.34 and R.sup.35 is a C.sub.1-C.sub.8 alkyl,
C.sub.3-C.sub.9 heterocyclyl, C.sub.3-C.sub.8 cycloalkyl, or
R.sup.34 and R.sup.35 together with the nitrogen atom they are bond
to form a C.sub.3-C.sub.8 cycloalkyl or C.sub.3-C.sub.9
heterocyclyl ring system;
[0106] each heterocyclic and heteroaryl ring system is optionally
substituted with C.sub.1-C.sub.3 alkyl, --OH, amino and carboxyl
groups; and
[0107] e is an integer of from 1 to 4.
[0108] In some less preferred embodiments R.sup.34 and R.sup.35 can
be hydrogen.
[0109] In one embodiment, the subscript e is preferably 2 and each
R.sup.32 and R.sup.33 is preferably independently selected from the
group, H, CH.sub.3, and a member in which R.sup.32 and R.sup.33 are
joined together to form a cyclopropyl, cyclobutyl, cyclopentyl,
cyclohexyl, or 1,1-dioxo-hexahydro-I.DELTA..sup.6-thiopyran-4-yl or
tetrahydropyran-4-yl group.
[0110] With regard to the prodrug group, preferred embodiments are
compounds wherein NR.sup.34R.sup.35 is morpholino.
[0111] In one embodiment, R is:
##STR00020##
[0112] wherein
[0113] each R.sup.32 and R.sup.33 is independently H,
C.sub.1-C.sub.8 alkyl, or optionally, if both present on the same
substituent, may be joined together to form a C.sub.3-C.sub.8
cycloalkyl, C.sub.6-C.sub.10 aryl, C.sub.3-C.sub.9 heterocyclyl or
C.sub.3-C.sub.9 heteroaryl ring system.
[0114] Within this embodiment, each R.sup.32 and R.sup.33 is
independently, H, CH.sub.3, or are joined together to form a
cyclopropyl, cyclopbutyl, cyclopentyl, cyclohexyl,
1,1-dioxo-hexahydro-I.lamda..sup.6-thiopyran-4-yl or
tetrahydropyran-4-yl group.
[0115] In a preferred embodiment, linkage of the prodrug moiety to
the rest of the active molecule is stable enough so that the serum
half life of the prodrug is from about 8 to about 24 hours.
[0116] In an embodiment of the invention, the prodrug moiety
comprises a tertiary amine having a pKa near the physiological pH
of 7.5. Any amines having a pKa within 1 unit of 7.5 are suitable
alternatives amines for this purpose. The amine may be provided by
the amine of a morpholino group. This pKa range of 6.5 to 8.5
allows for significant concentrations of the basic neutral amine to
be present in the mildly alkaline small intestine. The basic,
neutral form of the amine prodrug is lipophilic and is absorbed
through the wall of the small intestine into the blood. Following
absorption into the bloodstream, the prodrug moiety is cleaved by
esterases which are naturally present in the serum to release an
active compound.
[0117] Examples of R include, without limitation:
##STR00021## ##STR00022##
[0118] In another embodiment, R is as tabulated below:
TABLE-US-00001 R R.sup.1 m R.sup.34 R.sup.35 NR.sup.34R.sup.35
C(O)(CH.sub.2).sub.mNR.sup.34R.sup.35 isopropyl 2 Me Me
C(O)(CH.sub.2).sub.mNR.sup.34R.sup.35 isopropyl 3 Me Me
C(O)(CH.sub.2).sub.mNR.sup.34R.sup.35 isopropyl 4 Me Me
C(O)(CH.sub.2).sub.mNR.sup.34R.sup.35 isopropyl 2 ##STR00023##
C(O)(CH.sub.2).sub.mNR.sup.34R.sup.35 isopropyl 3 ##STR00024##
C(O)(CH.sub.2).sub.mNR.sup.34R.sup.35 isopropyl 4 ##STR00025##
C(O)O(CH.sub.2).sub.mNR.sup.34R.sup.35 isopropyl 2 Me Me
C(O)O(CH.sub.2).sub.mNR.sup.34R.sup.35 isopropyl 3 Me Me
C(O)O(CH.sub.2).sub.mNR.sup.34R.sup.35 isopropyl 4 Me Me
C(O)O(CH.sub.2).sub.mNR.sup.34R.sup.35 isopropyl 2 ##STR00026##
C(O)O(CH.sub.2).sub.mNR.sup.34R.sup.35 isopropyl 3 ##STR00027##
C(O)O(CH.sub.2).sub.mNR.sup.34R.sup.35 isopropyl 4 ##STR00028##
P(O)(OH).sub.2 isopropyl
an N oxide thereof, or a pharmaceutically acceptable salt of each
thereof.
[0119] In another aspect, R is,
##STR00029##
[0120] wherein
[0121] R.sup.36 is lower alkyl (e.g. C.sub.1-C.sub.6 alkyl).
[0122] In yet another aspect, R is:
##STR00030##
[0123] wherein X.sup.1, Y.sup.1 and X.sup.2 are as defined
herein.
[0124] In one embodiment, X.sup.1 is selected from the group
consisting of O, S and NR.sup.37 wherein R.sup.37 is hydrogen or
C.sub.1-C.sub.6 alkyl;
[0125] Y.sup.1 is --C(R.sup.38).sub.2 or a sugar moiety, wherein
each R.sup.38 is independently hydrogen or C.sub.1-C.sub.6 alkyl,
C.sub.3-C.sub.8 cycloalkyl, C.sub.3-C.sub.8 heterocyclyl,
C.sub.6-C.sub.10 aryl, or C.sub.3-C.sub.9 heteroaryl;
[0126] X.sup.2 is selected from the group consisting of halogen,
C.sub.1-C.sub.6 alkoxy, diacylglycerol, amino, C.sub.1-C.sub.6
alkylamino, C.sub.1-C.sub.6 dialkylamino, C.sub.1-C.sub.6
alkylthio, a PEG moiety, a bile acid moiety, a sugar moiety, an
amino acid moiety, a di- or tri-peptide, a PEG carboxylic acid, and
--U--V wherein
[0127] U is O or S; and
[0128] V is selected from the group consisting of C.sub.1-C.sub.6
alkyl, C.sub.3-C.sub.8 cycloalkyl, C.sub.3-C.sub.9 heterocyclyl,
C.sub.6-C.sub.10 aryl, C.sub.3-C.sub.9 heteroaryl,
C(W.sup.2)X.sup.3, PO(X.sup.3).sub.2, and SO.sub.2X.sup.3;
[0129] wherein W.sup.2 is O or NR.sup.39
[0130] wherein R.sup.39 is hydrogen or C.sub.1-C.sub.6 alkyl,
C.sub.3-C.sub.8 cycloalkyl, C.sub.3-C.sub.9 hetrocyclyl,
C.sub.6-C.sub.10 aryl, or C.sub.3-C.sub.8 heteroaryl; and
[0131] each X.sup.3 is independently amino, hydroxyl, mercapto,
C.sub.1-C.sub.6 alkyl, heteroalkyl, cycloalkyl, hetrocyclyl, aryl,
or heteroaryl, C.sub.1-C.sub.6 alkoxy, C.sub.1-C.sub.6 alkylamino,
C.sub.1-C.sub.6 dialkylamino, C.sub.1-C.sub.6 alkylthio, a bile
acid based alkoxy group, a sugar moiety, a PEG moiety, and
--O--CH.sub.2--CH(OR.sup.40)CH.sub.2X.sup.4R.sup.40,
[0132] wherein:
[0133] X.sup.4 is selected from the group consisting of O, S,
S.dbd.O, and SO.sub.2; and
[0134] each R.sup.40 is independently C.sub.10-C.sub.22 alkyl,
C.sub.3-C.sub.8 cycloalkyl, C.sub.3-C.sub.9 heterocyclyl,
C.sub.6-C.sub.10 aryl, or C.sub.3-C.sub.9 heteroaryl,
C.sub.1-C.sub.8 alkylene, or C.sub.1-C.sub.8 heteroalkylene.
[0135] Each heterocyclic and heteroaryl ring system is optionally
substituted with C.sub.1-C.sub.3 alkyl, --OH, amino and carboxyl
groups.
[0136] In one embodiment, the present invention utilizes the
following Y.sup.1 groups: CH.sub.2, CHMe, CH(isopropyl),
CH(tertiarybutyl), C(Me).sub.2, C(Et).sub.2, C(isopropyl).sub.2i
and C(propyl).sub.2.
[0137] In another embodiment, the present invention utilizes the
following X.sup.2 groups:
##STR00031##
[0138] -OMe, -OEt, --O-isopropyl, O-isobutyl, O-tertiarybutyl,
--O--COMe, --O--C(.dbd.O)(isopropyl), --O--C(.dbd.O)(isobutyl),
--O--C(.dbd.O)(tertiarybutyl), --O--C(.dbd.O)--NMe.sub.2,
--O--C(.dbd.O)--NHMe, --O--C(.dbd.O)--NH.sub.2,
--O--C(.dbd.O)--N(H)--CH(R.sup.41)--CO.sub.2Et wherein R.sup.41 is
a side chain C.sub.1-C.sub.6 alkyl, or C.sub.3-C.sub.8 heterocyclyl
group selected from the side chain groups present in essential
amino acids; --O--P(.dbd.O)(OMe).sub.2,
--O--P(.dbd.O)(O-isopropyl).sub.2, and
--O--P(.dbd.O)(O-isobutyl).sub.2. Each heterocyclic is optionally
substituted with one or more, preferably, 1-3, C.sub.1-C.sub.3
alkyl, --OH, amino and/or carboxyl groups.
[0139] In another embodiment, In one embodiment, R is:
##STR00032##
[0140] wherein
[0141] X.sup.3 is independently C.sub.1-C.sub.6 alkyl,
C.sub.3-C.sub.8 cycloalkyl, C.sub.3-C.sub.9 heterocyclyl,
C.sub.6-C.sub.10 aryl, or C.sub.3-C.sub.9 heteroaryl; and
[0142] R.sup.42 is independently hydrogen or C.sub.1-C.sub.6 alkyl,
C.sub.3-C.sub.8 cycloalkyl, C.sub.3-C.sub.9 heterocyclyl,
C.sub.6-C.sub.10 aryl, or C.sub.3-C.sub.9 heteroaryl.
[0143] Each heterocyclic is optionally substituted with one or
more, preferably, 1-3, C.sub.1-C.sub.3 alkyl, --OH, amino and/or
carboxyl groups.
[0144] In one embodiment, R is:
##STR00033##
[0145] wherein
[0146] each X.sup.3 is independently amino, hydroxyl, mercapto,
C.sub.1-C.sub.6 alkyl, C.sub.3-C.sub.8 cycloalkyl, C.sub.3-C.sub.9
heterocyclyl, C.sub.6-C.sub.10 aryl, or C.sub.3-C.sub.9 heteroaryl,
C.sub.1-C.sub.6 alkoxy, C.sub.1-C.sub.6 alkylamino, C.sub.1-C.sub.6
dialkylamino, C.sub.1-C.sub.6 alkylthio, a bile acid based alkoxy
group, a sugar moiety, a PEG moiety, and
--O--CH.sub.2--CH(OR.sup.40)CH.sub.2X.sup.4R.sup.40,
[0147] wherein:
[0148] X.sup.4 is selected from the group consisting of O, S,
S.dbd.O, and SO.sub.2; and
[0149] each R.sup.40 is independently C.sub.10-C.sub.22 alkyl,
C.sub.3-C.sub.8 cycloalkyl, C.sub.3-C.sub.9 heterocyclyl,
C.sub.6-C.sub.10 aryl, C.sub.3-C.sub.9 heteroaryl, C.sub.1-C.sub.8
alkylene, or C.sub.1-C.sub.8 heteroalkylene; and
[0150] R.sup.42 is independently hydrogen or C.sub.1-C.sub.6 alkyl,
C.sub.3-C.sub.8 cycloalkyl, C.sub.3-C.sub.9 heterocyclyl,
C.sub.6-C.sub.10 aryl, or C.sub.3-C.sub.9 heteroaryl.
[0151] In some embodiments, R.sup.42 is independently hydrogen or
C.sub.1-C.sub.6 alkyl, C.sub.3-C.sub.8 cycloalkyl, C.sub.3-C.sub.8
heterocyclyl, C.sub.6-C.sub.10 aryl, or C.sub.3-C.sub.9 heteroaryl;
and each X.sup.3 independently is C.sub.1-C.sub.6 alkyl,
C.sub.3-C.sub.8 cycloalkyl, C.sub.3-C.sub.9 heterocyclyl,
C.sub.6-C.sub.10 aryl, or C.sub.3-C.sub.8 heteroaryl,
C.sub.1-C.sub.6 alkoxy, C.sub.1-C.sub.6 alkylamino, C.sub.1-C.sub.6
dialkylamino, or C.sub.1-C.sub.6 alkylthio.
[0152] In some embodiments, R is represented by the following
structures:
##STR00034## ##STR00035## ##STR00036##
[0153] wherein, in the above examples, R.sup.43 is
C.sub.10-C.sub.22 alkyl or alkylene, R.sup.44 is H or
C.sub.1-C.sub.6 alkyl and R.sup.45 represents side chain alkyl
groups present in naturally occurring alpha amino acids;
##STR00037##
[0154] wherein R.sup.46 is (CH.sub.2).sub.n, f=2-4, and
CO--R.sup.47--NH.sub.2 represents an aminoacyl group; or
##STR00038##
[0155] wherein R.sup.46 is (CH.sub.2).sub.n, n=2-4, R.sup.47 is
(CH.sub.2).sub.n, n=1-3 and R.sup.49 is O or NMe.
[0156] In one embodiment, R is:
##STR00039##
[0157] In one aspect, R is
--C(R.sup.200R.sup.201)O(R.sup.202R.sup.203)P(O)OR.sup.204NR.sup.205R.sup-
.206, wherein each R.sup.200, R.sup.201, R.sup.202, R.sup.203,
R.sup.204R.sup.205 and R.sup.206 is independently H, a
C.sub.1-C.sub.8 alkyl, C.sub.3-C.sub.9 heterocyclyl,
C.sub.3-C.sub.8 cycloalkyl, C.sub.6-C.sub.10 aryl, C.sub.3-C.sub.9
heteroaryl, wherein each alkyl, heterocyclyl, cycloalkyl, aryl, and
heteroaryl is optionally substituted.
[0158] In some embodiments, R is
--CH(R.sup.201)OCH.sub.2P(O)OR.sup.204NHR.sup.206, wherein
R.sup.201 is C.sub.1-C.sub.8 alkyl, R.sup.204 is phenyl, optionally
substituted. In one embodiment, R.sup.206 is
--CHR.sup.207C(O)OR.sup.208 wherein R.sup.207 is selected from the
group consisting of the naturally occurring amino acid side chains
and --CO.sub.2H esters thereof and R.sup.208 is C.sub.1-C.sub.8
alkyl. In one embodiment, R.sup.206 is C.sub.1-C.sub.6 alkyl,
optionally substituted with 1-3, CO.sub.2H, SH, NH.sub.2,
C.sub.6-C.sub.10 aryl, and C.sub.2-C.sub.10 heteroaryl.
[0159] In one embodiment, R is:
##STR00040##
[0160] In one embodiment, R is:
##STR00041##
[0161] wherein Y.sup.1 is --C(R.sup.38).sub.2, wherein each
R.sup.38 is independently hydrogen or C.sub.1-C.sub.6 alkyl,
C.sub.3-C.sub.8 cycloalkyl, C.sub.3-C.sub.9 heterocyclyl,
C.sub.5-C.sub.10 aryl, or C.sub.3-C.sub.8 heteroaryl.
[0162] Various polyethylene glycol (PEG) moieties and synthetic
methods related to them that can be used or adapted to make
compounds of the invention are described in U.S. Pat. Nos.
6,608,076; 6,395,266; 6,194,580; 6,153,655; 6,127,355; 6,111,107;
5,965,566; 5,880,131; 5,840,900; 6,011,042 and 5,681,567.
[0163] In one embodiment, R is
##STR00042##
[0164] wherein
[0165] R.sup.50 is --OH or hydrogen;
[0166] R.sup.51 is --OH, or hydrogen;
[0167] W is --CH(CH.sub.3)W.sup.1;
[0168] wherein W.sup.1 is a substituted C.sub.1-C.sub.8 alkyl group
containing a moiety which is optionally negatively charged at
physiological pH,
[0169] said moiety is selected from the group consisting of
CO.sub.2H, SO.sub.3H, SO.sub.2H, --P(O)(OR.sup.52)(OH),
--OP(O)(OR.sup.52)(OH), and OSO.sub.3H,
[0170] wherein R.sup.52 is C.sub.1-C.sub.6 alkyl, C.sub.3-C.sub.8
cycloalkyl, C.sub.3-C.sub.9 heterocyclyl, C.sub.6-C.sub.10 aryl, or
C.sub.3-C.sub.9 heteroaryl.
[0171] Each heterocyclic and heteroaryl ring system is optionally
substituted with one or more, preferably 1-3, C.sub.1-C.sub.3
alkyl, --OH, amino and/or carboxyl groups.
[0172] In one embodiment, R is:
##STR00043##
[0173] wherein R.sup.53 is H or C.sub.1-C.sub.6 alkyl.
[0174] In another aspect, R is SO.sub.3H.
[0175] In another aspect, R comprises a cleavable linker, wherein
the term "cleavable linker" refers to a linker which has a short
half life in vivo. The breakdown of the linker Z in a compound
releases or generates the active compound. In one embodiment, the
cleavable linker has a half life of less than ten hours. In one
embodiment, the cleavable linker has a half life of less than an
hour. In one embodiment, the half life of the cleavable linker is
between one and fifteen minutes. In one embodiment, the cleavable
linker has at least one connection with the structure:
C*--C(.dbd.X*)X*--C* wherein C* is a substituted or unsubstituted
methylene group, and X* is S or O. In one embodiment, the cleavable
linker has at least one C*--C(.dbd.O)O--C* connection. In one
embodiment, the cleavable linker has at least one
C*--C(.dbd.O)S--C* connection. In one embodiment, the cleavable
linker has at least one --C(.dbd.O)N*--C*--SO.sub.2--N*-connection,
wherein N* is --NH-- or C.sub.1-C.sub.6 alkylamino. In one
embodiment, the cleavable linker is hydrolyzed by an esterase
enzyme.
[0176] In one embodiment, the linker is a self-immolating linker,
such as that disclosed in U.S. patent publication 2002/0147138, to
Firestone; PCT Appl. No. U505/08161 and PCT Pub. No. 2004/087075.
In another embodiment, the linker is a substrate for enzymes. See
generally Rooseboom et al., 2004, Pharmacol. Rev. 56:53-102.
Pharmaceutical Compositions
[0177] In further aspects of the invention, a composition is
provided comprising any of the compounds described herein, and at
least a pharmaceutically acceptable excipient.
[0178] In another aspect, this invention provides a composition
comprising any of the compounds described herein, and a
pharmaceutically acceptable excipient.
[0179] Such compositions can be formulated for different routes of
administration. Although compositions suitable for oral delivery
will probably be used most frequently, other routes that may be
used include transdermal, intravenous, intraarterial, pulmonary,
rectal, nasal, vaginal, lingual, intramuscular, intraperitoneal,
intracutaneous, intracranial, and subcutaneous routes. Suitable
dosage forms for administering any of the compounds described
herein include tablets, capsules, pills, powders, aerosols,
suppositories, parenterals, and oral liquids, including
suspensions, solutions and emulsions. Sustained release dosage
forms may also be used, for example, in a transdermal patch form.
All dosage forms may be prepared using methods that are standard in
the art (see e.g., Remington's Pharmaceutical Sciences, 16.sup.th
ed., A. Oslo editor, Easton Pa. 1980).
[0180] Pharmaceutically acceptable excipients are non-toxic, aid
administration, and do not adversely affect the therapeutic benefit
of the compound of this invention. Such excipients may be any
solid, liquid, semi-solid or, in the case of an aerosol
composition, gaseous excipient that is generally available to one
of skill in the art. Pharmaceutical compositions in accordance with
the invention are prepared by conventional means using methods
known in the art.
[0181] The compositions disclosed herein may be used in conjunction
with any of the vehicles and excipients commonly employed in
pharmaceutical preparations, e.g., talc, gum arabic, lactose,
starch, magnesium stearate, cocoa butter, aqueous or non-aqueous
solvents, oils, paraffin derivatives, glycols, etc. Coloring and
flavoring agents may also be added to preparations, particularly to
those for oral administration. Solutions can be prepared using
water or physiologically compatible organic solvents such as
ethanol, 1,2-propylene glycol, polyglycols, dimethylsulfoxide,
fatty alcohols, triglycerides, partial esters of glycerin and the
like.
[0182] Solid pharmaceutical excipients include starch, cellulose,
hydroxypropyl cellulose, talc, glucose, lactose, sucrose, gelatin,
malt, rice, flour, chalk, silica gel, magnesium stearate, sodium
stearate, glycerol monostearate, sodium chloride, dried skim milk
and the like. Liquid and semisolid excipients may be selected from
glycerol, propylene glycol, water, ethanol and various oils,
including those of petroleum, animal, vegetable or synthetic
origin, e.g., peanut oil, soybean oil, mineral oil, sesame oil,
etc. In certain embodiments, the compositions provided herein
comprises one or more of .alpha.-tocopherol, gum arabic, and/or
hydroxypropyl cellulose.
[0183] In one embodiment, this invention provides sustained release
formulations such as drug depots or patches comprising an effective
amount of a compound provided herein. In another embodiment, the
patch further comprises gum Arabic or hydroxypropyl cellulose
separately or in combination, in the presence of alpha-tocopherol.
Preferably, the hydroxypropyl cellulose has an average MW of from
10,000 to 100,000. In a more preferred embodiment, the
hydroxypropyl cellulose has an average MW of from 5,000 to
50,000.
[0184] Compounds and pharmaceutical compositions of this invention
maybe used alone or in combination with other compounds. When
administered with another agent, the co-administration can be in
any manner in which the pharmacological effects of both are
manifest in the patient at the same time. Thus, co-administration
does not require that a single pharmaceutical composition, the same
dosage form, or even the same route of administration be used for
administration of both the compound of this invention and the other
agent or that the two agents be administered at precisely the same
time. However, co-administration will be accomplished most
conveniently by the same dosage form and the same route of
administration, at substantially the same time. Obviously, such
administration most advantageously proceeds by delivering both
active ingredients simultaneously in a novel pharmaceutical
composition in accordance with the present invention.
Methods of Treatment
[0185] In aspects of the invention, a method is provided for
increasing tissue and/or cellular oxygenation, the method
comprising administering to a subject in need thereof a
therapeutically effective amount of any of the compounds or
compositions described herein.
[0186] In aspects of the invention, a method is provided for
increasing oxygen affinity of hemoglobin S in a subject, the method
comprising administering to a subject in need thereof a
therapeutically effective amount of any of the compounds or
compositions described herein.
[0187] In aspects of the invention, a method is provided for
treating a condition associated with oxygen deficiency, the method
comprising administering to a subject in need thereof a
therapeutically effective amount of any of the compounds or
compositions described herein.
[0188] In further aspects of the invention, a method is provided
for treating oxygen deficiency associated with sickle cell anemia,
the method comprising administering to a subject in need thereof a
therapeutically effective amount of any of the compounds or
compositions described herein.
[0189] In further aspects of the invention, a method is provided
for treating sickle cell disease, the method comprising
administering to a subject in need thereof a therapeutically
effective amount of a compound of any of the compounds or
compositions described herein. In still further aspects of the
invention, a method is provided for treating cancer, a pulmonary
disorder, stroke, high altitude sickness, an ulcer, a pressure
sore, Alzheimer's disease, acute respiratory disease syndrome, and
a wound, the method comprising administering to a subject in need
thereof a therapeutically effective amount of a compound of any of
the compounds or compositions described herein.
Synthetic Methods
[0190] Certain methods for making the compounds described herein
are also provided. The reactions are preferably carried out in a
suitable inert solvent that will be apparent to the skilled artisan
upon reading this disclosure, for a sufficient period of time to
ensure substantial completion of the reaction as observed by thin
layer chromatography, .sup.1H-NMR, etc. If needed to speed up the
reaction, the reaction mixture can be heated, as is well known to
the skilled artisan. The final and the intermediate compounds are
purified, if necessary, by various art known methods such as
crystallization, precipitation, column chromatography, and the
likes, as will be apparent to the skilled artisan upon reading this
disclosure.
[0191] An illustrative and non-limiting method for synthesizing a
compound of formula (I), is schematically shown below.
[0192] In the following Schemes,
##STR00044##
refer to rings B and C as described herein; [0193] L, R.sup.3 and
R.sup.70 are as described herein; [0194] A.sup.5 and B.sup.5 are
independently NR.sup.14, O, S, S(O)x, NBoC, CH.sub.2, CHR.sup.14,
C(R.sup.14).sub.2 provided that when both A.sup.5 and B.sup.5 are
present in a ring, both are not CH.sub.2, CHR.sup.14,
C(R.sup.14).sub.2, and provided that if only a single A.sup.5 or
B.sup.5 is present in a ring, that A.sup.5 or B.sup.5 is not
CH.sub.2, CHR.sup.14, C(R.sup.14).sub.2; [0195] R.sup.14 is
C.sub.1-C.sub.6 alkyl, COR.sup.15 or COOR.sup.15; wherein R.sup.15
is optionally substituted C.sub.1-C.sub.6 alkyl, optionally
substituted C.sub.6-C.sub.10 aryl, optionally substituted 5-10
membered heteroaryl containing up to 5 ring heteroatoms, or
optionally substituted 4-10 membered heterocycle containing up to 5
ring heteroatoms, wherein the heteroatom is selected from the group
consisting of O, N, S, and oxidized forms of N and 5;
[0196] X, and X.sup.5 each represents a leaving group and are
independently selected from Cl, Br, and I.
[0197] X.sup.6 represents CR, N, O, S(O)x; wherein x is 0, 1, or 2;
[0198] Y.sup.5 represents a leaving group selected from CI, F, Br,
I, OSO.sub.2R.sup.71 and OSO.sub.2Ar; [0199] R.sup.71 is
C.sub.1-C.sub.6 alkyl; [0200] Ar is phenyl optionally substituted
with 1-3 halo and/or C.sub.1-C.sub.4 alkyl groups; [0201] n is 0,
1, or 2.
General Synthetic Schemes
##STR00045##
[0203] General Method a for Preparing Aryloxy/Heteroarylether
Analogs (4a/4b) from Substituted Methylene Alcohol (1) and Hydroxyl
(Hetero)Aryl Aldehyde Derivatives (3a/3b).
[0204] A hydroxyl (hetero)arylaldehyde derivatives (3a/3b) (0.1-2
mmol) mixture with substituted methylene alcohol (1) (0.8 to 1.2
eq) and PPh.sub.3 (1-1.5 eq) in anhydrous THF (1-10 mL) was stirred
under nitrogen until complete dissolution. The solution was cooled
to 0.degree. C. on ice bath and DIAD or DEAD (1.1 eq) in THF or
toluene was added dropwise over a 1-20 min period. The ice cooling
bath was allowed to expire over 90 min and the mixture was stirred
at RT for 2-48 hours. The mixture was stirred for 10 min, then
filtered through a pad of silica. The silica was washed with ethyl
acetate 2-20 mL. The combined filtrates were evaporated and the
residue was dried on highvac. The residue was purified by
preparative HPLC or flash silica gel chromatography.
[0205] General Method B for Preparing Aryloxy/Heteroarylether
Analogs (4a/4b) from Substituted Methylene Halide (2) and Hydroxyl
(Hetero)Aryl Aldehyde Derivatives (3a/3b).
[0206] A mixture of hydroxyl (hetero)arylaldehyde derivatives
(3a/3b) (0.1-2 mmol, 1-4 eq.), substituted methylene chloride or
bromide (2) (1 eq), and K.sub.2CO.sub.3 (2-5 eq.) (catalytic amount
of Nal or Bu.sub.4NI may also be added) in DMF or acetonitrile (1
to 10 mL) was stirred at RT or heating up to 120.degree. C. for
0.5-8 h under nitrogen atmosphere. In workup A, water was added to
the reaction mixture, the precipitated product was collected,
washed with water, and then subjected to preparative HPLC or flash
silica gel chromatography purification. In workup B (for products
that did not precipitate), diluted HCl or aqueous NH.sub.4CI was
added at 0.degree. C. to adjusted the pH to .sup..about.7, the
reaction mixture was partitioned between ethyl acetate or
dichloromethane and aqueous sodium chloride and the organic layer
separated, dried, and solvent removed under vacuum to afford crude
product which was purified by automated silica gel column
chromatography using appropriate solvents mixture (e.g., ethyl
acetate/hexanes).
[0207] General Method C for Preparing Substituted Methylene
Chloride (2a).
[0208] To a solution of substituted methylene alcohol (1) (0.1 to 2
mmol) in DCM (1-10 mL) was added SOCl.sub.2 dropwise (2 eq to 5 eq)
at 0.degree. C. or RT. The reaction mixture was stirred at RT for
10 min to 6 h, or until reaction is judged complete (LC/MS). The
reaction mixture is concentrated to dryness over a rotavap. The
crude chloride residue was suspended in toluene, sonicated and
concentrated to dryness. The process was repeated three times and
dried under vacuum to give the substituted methylene chloride (2),
usually as an off-white solid, which was used for next step without
further purification. Alternatively, a solution of aqueous 1N
Na.sub.2CO.sub.3 is then added to produce a solution of
pH.sup..about.8. the mixture was extracted with DCM (3.times.10-50
mL), dried over sodium sulfate, and concentrated to the crude
substituted methylene chloride (2a), which is then purified by
column chromatography on silica gel (0-100% ethyl
acetate-hexanes).
[0209] General Method D for Preparing Substituted Methylene Bromide
(2b).
[0210] To a solution of substituted methylene alcohol (1) (0.1 to 2
mmol) in DCM (1-10 mL) was added Ph.sub.3P Br.sub.2 dropwise (2 eq
to 5 eq) at 0.degree. C. or RT. The reaction mixture was stirred at
RT for 10 min to 2 h, or until reaction is judged complete (LC/MS).
The reaction mixture is concentrated to dryness over a rotavap. The
residue purified by column chromatography on silica gel (0-100%
ethyl acetate-hexanes) to afford the pure bromide 2b.
##STR00046##
[0211] General Method E for Preparing Heterocyclic Methylene
Derivatives 9, 10, 12 and 13.
[0212] Reduction of the ester group of heterocyclohexene
carboxylate 8 by LAH or DIBAL gives the corresponding alcohol 9-OH
(Step 4). Further reaction of the alcohol 9-OH with thionyl
chloride, Ph.sub.3PBr.sub.2 (or CBr.sub.4--Ph.sub.3P or PBr.sub.3),
or alkyl/aryl sufonyl chloride produces the corresponding 10-X
chloride, bromide or sulfonate (Step 5).
[0213] Alternatively, the double bond of heterocyclohexene
carboxylate 8 is reduced to give the cis-heterocyclohexane 11-cis
carboxylate under palladium catalyzed hydrogenation conditions
(Step 6). Reduction of the ester group of 11-cis by LAH or DIBAL
yields cis-alcohol 12-OH-cis (Step 8). Conversion of the alcohol
12-OH-cis to its chloride, bromide or sulfonate (such as mesylate,
tosylate) 13-X-cis can be achieved by reacting with thionyl
chloride, or Ph.sub.3PBr.sub.2, or sufonyl chloride (such as mesyl
chloride or tosyl chloride) (Step 9). The cis-cyclohexane
carboxylate 11-cis can also be isomerized to the thermodynamically
more stable trans-isomer 11-trans by the treatment with an
alcoholic alkoxide (e.g., ethoxide) solution. Analogously,
transformation of 11-trans ester to 12-trans alcohol and 13-X-trans
halide is accomplished by applying conditions of Step 8 and Step 9
similar to these for the corresponding cis-isomers.
##STR00047##
[0214] Coupling of the (hetero)cyclic methylene derivatives 9, 10,
12 and 13 with hydroxyl (hetero)arylaldehyde derivatives (3a/3b) by
general method A or B affords the corresponding
aryloxy/heteroarylether analogs (4c and 4d).
##STR00048##
[0215] General Method F for Preparing Heterocyclic Methylene
Derivatives 18, 19, 20 and 21.
[0216] The ketone ester 14 is converted to the triflate
intermediate 15 by treating with a triflating agent (e.g, triflic
anhydride) in the presence of an organic base such as Hunig's base
(Step 1). Suzuki coupling of the triflate 15 with a boronic acid or
ester affords heterocyclo carboxylate 16 (Step 2). Subsequent
reduction of the ester group by LAH or DIBAL gives the
corresponding alcohol 18 (Step 3). Further reaction of the alcohol
18 with thionyl chloride, Ph.sub.3PBr.sub.2 (or CBr.sub.4-Ph.sub.3P
or PBr.sub.3), or alkyl/aryl sufonyl chloride produces the
corresponding 19 chloride, bromide or sulfonate (Step 4).
[0217] Alternatively, the double bond of 16 is reduced to give the
saturated heterolic analog 17 under palladium catalyzed
hydrogenation conditions (Step 5). Reduction of the ester group of
17 by LAH or DIBAL yields alcohol 20 (Step 7). Conversion of the
alcohol 20 to its chloride, bromide or sulfonate (such as mesylate,
tosylate) 21 can be achieved by reacting with thionyl chloride, or
Ph.sub.3PBr.sub.2, or sufonyl chloride (such as mesyl chloride or
tosyl chloride) (Step 8).
[0218] Coupling of the (hetero)cyclic methylene derivatives 18, 19,
20 and 21 with hydroxyl (hetero)arylaldehyde derivatives (3a/3b) by
general method A or B affords the corresponding
aryloxy/heteroaryloxyether analogs (4e and 4f).
[0219] Chiral pyrrolidine methylene derivatives 25 and 26 can be
prepared according to reaction sequence depicted herein. The
pyrrolidine ester 24 is produced via a 1,3-dipolar cycloaddition of
alkene 22 with azomethine-ylide generated in situ from formaldehyde
and amino acid 23 alkene (Step 1). Subsequent reduction of the
ester to alcohol 24 and further conversion 25 are accomplished by
analogous methods described herein. If a chiral auxiliary group
such as chiral oxazolidinone derivative 22a is used, optically
active pyrrolidine derivatives 25 and 26 can also be obtained.
Coupling of 25 and 26 with hydroxyl (hetero)arylaldehyde
derivatives (3a/3b) by general method A or B affords the
corresponding aryloxy/heteroaryloxyether analogs (4).
##STR00049## ##STR00050##
[0220] Separate from the general synthesis of tetrahydrothiophenes
(i.e., 20 and 21, A=S) described herein. Also described is a
different synthetic approach to this class of analogs.
##STR00051##
[0221] Other heterocyclic analogs (compound 5) with C--N linkage
are synthesized by applying Buchwald/Hartwig amination conditions.
Many of the cyclic amines (1) are available commercially (e.g., 1a,
1b, 1c, 1d, and 1e).
##STR00052## ##STR00053##
[0222] Protected amides of formula --CONHR.sup.95 and
--CONHOR.sup.95 can be converted e.g., hydrolyzed to the
corresponding amides according to methods known to the skilled
artisan.
Prodrug Synthesis
[0223] Syntheses of the ester prodrugs start with the free
carboxylic acid bearing the tertiary amine. The free acid is
activated for ester formation in an aprotic solvent and then
reacted with a free alcohol group in the presence of an inert base,
such as triethyl amine, to provide the ester prodrug. Activating
conditions for the carboxylic acid include forming the acid
chloride using oxalyl chloride or thionyl chloride in an aprotic
solvent, optionally with a catalytic amount of dimethyl formamide,
followed by evaporation. Examples of aprotic solvents, include, but
are not limited to methylene chloride, tetrahydrofuran, and the
like. Alternatively, activations can be performed in situ by using
reagents such as BOP (benzotriazol-1-yloxytris(dimethylamino)
phosphonium hexafluorolphosphate, and the like (see Nagy et al.,
1993, Proc. Natl. Acad. Sci. USA 90:6373-6376) followed by reaction
with the free alcohol. Isolation of the ester products can be
affected by extraction with an organic solvent, such as ethyl
acetate or methylene chloride, against a mildly acidic aqueous
solution; followed by base treatment of the acidic aqueous phase so
as to render it basic; followed by extraction with an organic
solvent, for example ethyl acetate or methylene chroride;
evaporation of the organic solvent layer; and recrystalization from
a solvent, such as ethanol. Optionally, the solvent can be
acidified with an acid, such as HCl or acetic acid to provide a
pharmaceutically acceptable salt thereof. Alternatively the crude
reaction can be passed over an ion exchange column bearing sulfonic
acid groups in the protonated form, washed with deionized water,
and eluted with aqueous ammonia; followed by evaporation.
[0224] Suitable free acids bearing the tertiary amine are
commercially available, such as 2-(N-morpholino)-propionic acid,
N,N-dimethyl-beta-alanine, and the like. Non-commercial acids can
be synthesized in straightforward manner via standard literature
procedures.
[0225] Carbonate and carbamate prodrugs can be prepared in an
analogous way. For example, amino alcohols and diamines can be
activated using activating agents such as phosgene or carbonyl
diimidazole, to provide an activated carbonates, which in turn can
react with the alcohol and/or the phenolic hydroxy group on the
compounds utilized herein to provide carbonate and carbamate
prodrugs.
[0226] Various protecting groups and synthetic methods related to
them that can be used or adapted to make compounds of the invention
can be adapted from the references Testa et al., Hydrolysis in Drug
and Prodrug Metabolism, June 2003, Wiley-VCH, Zurich, 419-534 and
Beaumont et al., Curr. Drug Metab. 2003, 4:461-85.
[0227] Provided herein is a method of synthesizing an acyloxymethyl
version of a prodrug by adapting a method from the reference
Sobolev et al., 2002, J. Org. Chem. 67:401-410.
##STR00054##
[0228] R.sup.51 is C.sub.1-C.sub.6 alkyl.
[0229] Provided herein is a method for synthesizing a
phosphonooxymethyl version of a prodrug by adapting a method from
Mantyla et al., 2004, J. Med. Chem. 47:188-195.
##STR00055##
[0230] Provided herein is a method of synthesizing an
alkyloxymethyl version of a prodrug
##STR00056##
R.sup.52 is C.sub.1-C.sub.6 alkyl, C.sub.3-C.sub.8 cycloalkyl,
C.sub.3-C.sub.9 heterocyclyl, C.sub.6-C.sub.10 aryl, or
C.sub.3-C.sub.9 heteroaryl.
EXAMPLES
[0231] The following examples are given for the purpose of
illustrating various embodiments of the invention and are not meant
to limit the present invention in any fashion. The present
examples, along with the methods described herein are presently
representative of preferred embodiments, are exemplary, and are not
intended as limitations on the scope of the invention. Changes
therein and other uses which are encompassed within the spirit of
the invention as defined by the scope of the claims will occur to
those skilled in the art.
[0232] In the examples below as well as throughout the application,
the following abbreviations have the following meanings. If not
defined, the terms have their generally accepted meanings. [0233]
.degree. C.=degrees Celsius [0234] RT=Room temperature [0235]
min=minute(s) [0236] h=hour(s) [0237] .mu.L=Microliter [0238]
mL=Milliliter [0239] mmol=Millimole [0240] eq=Equivalent [0241]
mg=Milligram [0242] ppm=Parts per million [0243] atm=Atmospheric
pressure [0244] MS=Mass spectrometry [0245] LC-MS=Liquid
chromatography-mass spectrometry [0246] HPLC=High performance
liquid chromatography [0247] NMR=Nuclear magnetic resonance [0248]
Sat./sat.=Saturated [0249] MeOH=Methanol [0250] EtOH=Ethanol [0251]
EtOAc=Ethyl acetate [0252] Et.sub.3N=Triethylamine [0253]
Ac.sub.2O=Acetic anhydride [0254] Na(OAc).sub.3BH=Sodium triacetoxy
borohydride [0255] PBr.sub.3=phosphorus tribromide [0256]
Ph.sub.3P=Triphenylphosphine [0257]
Ph.sub.3PBr.sub.2=Triphenylphosphine dibromide [0258] CBr.sub.4
Tetrabromomethane [0259] DMF=N, N-Dimethylformamide [0260]
DCM=Dichloromethane [0261] LAH/LiAlH.sub.4=Lithium aluminum hydride
[0262] THF=Tetrahydrofuran [0263] DIBAL=Diisobutylaluminium hydride
[0264] DIAD=Diisopropyl azodicarboxylate [0265] DEAD=Diethyl
azodicarboxylate [0266] DIPEA=N,N-Diisopropylethylamine [0267]
Pd(dppf)Cl.sub.2=[1,1'-Bis(diphenylphosphino)ferrocene]dichloropalladium(-
II), complex
[0268] The following representative B-ring and C-ring intermediates
may be incorporated into the compounds of the invention by methods
that are commonly known to the skilled artisan.
Preparation of
5-hydroxy-2-(2-methoxyethoxyl)isonicotinaldehyde)
##STR00057##
[0269] Step 1
##STR00058##
[0271] To a solution of 6-(benzyloxy)pyridin-3-ol (2.0 g, 10 mmol,
1 eq.) in DMF (20 mL) was added NaH (60% in mineral oil; 0.6 g, 15
mmol, 1.5 eq.) at 0-5.degree. C. portion-wise. Upon the completion
of addition, the mixture was continued to stir at 0-5.degree. C.
for 15 min, added chloromethyl methyl ether (0.88 g, 11 mmol, 1.1
eq.), stirred at 0-5.degree. C. for another 20 min, and quenched
with NH.sub.4Cl.sub.(sat.) solution. The aqueous layer was
extracted with EtOAc (3.times.20 mL) and the combined organic
layers were washed with water and brine, dried over
Na.sub.2SO.sub.4, concentrated, and purified on silica gel using
25% EtOAc/hexanes as eluent to give
2-(benzyloxy)-5-(methoxymethoxy)pyridine (2.1 g, 87%) as a
colorless oil. MS (ESI) m/z 246.1 [M+H].sup.+.
Step 2
##STR00059##
[0273] To 2-(benzyloxy)-5-(methoxymethoxy)pyridine (1.8 g, 8.71
mol) in EtOH was added Pd/C (1.0 g). The mixture was charged with
H.sub.2 (15 psi), stirred at RT for 45 min, filtered, and
concentrated to give 5-(methoxymethoxy)pyridin-2-ol (1.35 g,
quantitative yield) as a pale yellow solid. MS (ESI) m/z 156.1
[M+H].sup.+.
Step 3
##STR00060##
[0275] To a mixture of 5-(methoxymethoxy)pyridin-2-ol (1.35 g, 8.71
mmol, 1 eq.) and K.sub.2CO.sub.3 (6.01 g, 43.6 mmol, 5.0 eq.) in
DMF (30.0 mL) was added 1-bromo-2-methoxyethane (3.61 g, 26.1 mmol,
3 eq.). The mixture was heated at 60.degree. C. for 2 h, cooled,
filtered, concentrated, and purified on silica gel using a mixture
of EtOAc and hexanes as eluent to give
2-(2-methoxyethoxy)-5-(methoxymethoxy)pyridine (500 mg, 27%) as a
colorless oil. .sup.1H NMR (400 MHz, CDCl.sub.3) .delta. 7.94 (d,
J=3.0 Hz, 1H), 7.35 (ddd, J=8.9, 3.0, 1.0 Hz, 1H), 6.76 (dd, J=8.9,
1.0 Hz, 1H), 5.11 (s, 2H), 4.48-4.40 (m, 2H), 3.79-3.71 (m, 2H),
3.50 (s, 3H), 3.45 (s, 3H). MS (ESI) m/z 214.1 [M+H].sup.+.
Step 4
##STR00061##
[0277] To a mixture of
2-(2-methoxyethoxy)-5-(methoxymethoxy)pyridine (1.34 g, 6.3 mol, 1
eq.) and diisopropylamine (17.5 uL, 0.13 mmol, 0.02 eq.) in THF (50
mL) was added methyl lithium (1.6 M/THF, 7 mL, 11.3 mol, 1.8 eq.)
at -40.degree. C. Upon the completion of addition, the mixture was
warmed to 0.degree. C., continued to stir at 0.degree. C. for 3 h,
cooled back down to -40.degree. C., and added DMF (0.83 mL, 11.3
mol, 1.8 eq.) slowly. The mixture was then stirred at -40.degree.
C. for 1 h, quenched with a mixture of HCl (12 N, 12 mL) and THF
(28 mL), warmed to RT, and added water (20 mL). The pH of the
mixture was adjusted to pH 8-9 with solid K.sub.2CO.sub.3. The
aqueous layer was extracted with EtOAc (30 mL) twice. The combined
organic layers were dried over Na.sub.2SO.sub.4, concentrated, and
purified on silica gel using a mixture of EtOAc and hexanes as
eluent to give a mixture of
2-(2-methoxyethoxy)-5-(methoxymethoxy)isonicotinaldehyde and
2-(2-methoxyethoxy)-5-(methoxymethoxy)nicotinaldehyde (5/1, 1.27 g,
83.6%) as a pale yellow oil. .sup.1H NMR (400 MHz, CDCl.sub.3)
.delta. 10.45 (s, 1H), 8.23 (s, 1H), 7.16 (s, 1H), 5.27 (s, 2H),
4.46 (dd, J=5.4, 3.9 Hz, 2H), 4.14 (q, J=7.1 Hz, 1H), 3.77-3.71 (m,
2H), 3.56 (s, 3H), 3.46 (s, 3H) and .sup.1H NMR (400 MHz,
CDCl.sub.3) .delta. 10.41 (s, 1H), 8.18 (d, J=3.2 Hz, 1H), 7.85 (d,
J=3.1 Hz, 1H), 5.16 (s, 2H), 4.64-4.57 (m, 2H), 3.85-3.79 (m,
J=5.4, 4.0 Hz, 2H), 3.50 (s, 3H), 3.46 (s, 3H); MS (ESI) m/z 242.1
[M+H].sup.+.
Step 5
##STR00062##
[0279] To a solution of
2-methoxy-5-(methoxymethoxy)isonicotinaldehyde (1.27 g, 5.29 mol)
in THF (5 mL) was added HCl (3 N, 4 mL). The reaction was stirred
at 50.degree. C. for 1 h, cooled to RT, and diluted with water (5
mL). The mixture was neutralized to pH 7-8 with solid
K.sub.2CO.sub.3 and the aqueous layer was extracted with EtOAc (100
mL) twice. The combined organic layers were dried over
Na.sub.2SO.sub.4, concentrated, and purified on silica gel using a
mixture of EtOAc and hexanes to give
5-hydroxy-2-(2-methoxyethoxyl)isonicotinaldehyde (630 mg, 60%) and
5-hydroxy-2-(2-methoxyethoxyl)nicotinaldehyde (120 mg, 11%). Data
for 5-hydroxy-2-(2-methoxyethoxyl)isonicotinaldehyde: .sup.1H NMR
(400 MHz, CDCl.sub.3) .delta. 9.98 (s, 1H), 9.50 (s, 1H), 8.07 (s,
1H), 7.02 (s, 1H), 4.51-4.39 (m, 2H), 3.81-3.72 (m, 2H), 3.47 (s,
3H). LRMS (M+H.sup.+) m/z 198.1. Data for and
5-hydroxy-2-(2-methoxyethoxy) nicotinaldehyde: .sup.1H NMR (400
MHz, CDCl.sub.3) .delta. 10.3 (s, 1H), 7.99 (d, J=3.2 Hz, 1H), 7.58
(d, J=3.2 Hz, 1H), 7.18-7.07 (br, 1H), 4.54 (dd, I=5.4, 3.7 Hz,
2H), 3.84 (dd, J=5.4, 3.7 Hz, 2H), 3.49 (s, 3H); MS (ESI) m/z 198.1
[M+H].sup.+.
Preparation of 2,6-dihydroxybenzaldehyde
##STR00063##
[0281] Into a 3000-mL three neck round-bottom flask, was placed a
solution of AlCl.sub.3 (240 g, 1.80 mol, 3.00 equiv) in
dichloromethane (1200 mL). A solution of 2,6-dimethoxybenzaldehyde
(100 g, 601.78 mmol, 1.00 eq) in dichloromethane (800 ml) was added
to the reaction mixture dropwise at 0.degree. C. The resulting
solution was stirred overnight at room temperature, and then it was
quenched with 200 mL of diluted HCl (2M). The resulting solution
was extracted with 2.times.200 mL of dichloromethane. The combined
organic layers were concentrated under vacuum. The residue was
applied onto a silica gel column with ethyl acetate/petroleum ether
(1:200-1:50) as eluent to furnish 40 g (48%) of
2,6-dihydroxybenzaldehyde as a yellow solid.
[0282] .sup.1HNMR (300 MHz, DMSO-d.sub.6) .delta. 11.25 (s, 2H),
10.25 (s, 1H), 7.36 (m, 1H), 6.36 (d, J=8.4 Hz 2H); MS (ESI) m/z
139 [M+H].sup.+.
Preparation of 5-hydroxy-2-methoxyisonicotinaldehyde
##STR00064##
[0284] Step 1:
[0285] To a solution of 6-methoxypyridin-3-ol (20 g, 0.16 mol) in
DMF (200 mL) was added NaH (60% in mineral oil; 9.6 g, 0.24 mol) at
0-5.degree. C. portion-wise. Upon the completion of addition, the
mixture was continued to stir at 0-5.degree. C. for 15 min followed
by additional of chloromethyl methyl ether. The mixture was stirred
at 0-5.degree. C. for another 20 min and quenched with aqueous
NH.sub.4Cl.sub.(sat.). The aqueous layer was extracted with EtOAc
(3.times.100 mL) and the combined organic layer was washed with
water and brine, dried over Na.sub.2SO.sub.4, and concentrated
under reduced pressure. The residue was purified on silica gel with
25% EtOAc/hexanes as eluent to give
2-methoxy-5-(methoxymethoxy)pyridine (24.1 g, 89.3%) as a colorless
oil. .sup.1H NMR (400 MHz; CDCl.sub.3) 7.97 (d, 1H), 7.35 (dd, 1H),
6.70 (d, 1H), 5.12 (s, 2H), 3.91 (s, 3H), 3.51 (s, 3H); MS (ESI)
m/z 170.1 [M+H].sup.+.
[0286] Step 2:
[0287] To a mixture of 2-methoxy-5-(methoxymethoxy)pyridine (30 g,
0.178 mol) and diisopropylamine (507 uL, 3.6 mmol) in THF (500 mL)
was added methyl lithium (1.6 M/THF, 200 mL, 0.32 mol) at
-40.degree. C. Upon the completion of addition, the mixture was
warmed to 0.degree. C. and continued to stir at 0.degree. C. for 3
h. The reaction mixture was then cooled back down to -40.degree. C.
followed by addition of DMF (24.7 mL, 0.32 mol) slowly. The mixture
was then stirred at -40.degree. C. for 1 h and quenched with a
mixture of HCl (12 N, 120 mL) and THF (280 mL). Water (200 mL) was
added and the pH of the mixture was adjusted to pH 8-9 with solid
K.sub.2CO.sub.3. The mixture was extracted with EtOAc (300 mL)
twice. The organic layer was combined, dried over Na.sub.2SO.sub.4,
and concentrated to give
2-methoxy-5-(methoxymethoxy)isonicotinaldehyde (33.5 g, 95.7%) as a
brown solid, which was used for next step without further
purification. .sup.1H NMR (400 MHz; CD.sub.3OD) 7.90 (s, 1H), 6.92
(s, 1H), 5.64 (s, 1H), 5.20 (s, 2H), 3.84 (s, 3H), 3.48 (s, 3H); MS
(ESI) m/z 198.1 [M+H].sup.+.
[0288] Step 3:
[0289] To a solution of
2-methoxy-5-(methoxymethoxy)isonicotinaldehyde (33.5 g, 0.17 mol)
in THF (150 mL) was added HCl (3 N, 250 mL). The reaction was
stirred at 50.degree. C. for 1 h, cooled to RT and diluted with
water (500 mL). The mixture was neutralized to pH 7-8 with solid
K.sub.2CO.sub.3. The pale yellow solid was collected, washed with
water, and dried in vacuum oven (40.degree. C.) overnight to give
5-hydroxy-2-methoxyisonicotinaldehyde (17.9 g, 74.6%). .sup.1H NMR
(400 MHz; DMSO)=10.31 (s, 1H), 8.03 (s, 1H), 6.89 (s, 1H), 3.80 (s,
3H); MS (ESI) m/z 154.0 [M+H].sup.+.
[0290] From the foregoing it will be appreciated that, although
specific embodiments of the invention have been described herein
for purposes of illustration, various modifications may be made
without deviating from the spirit and scope of the invention.
[0291] Throughout the description of this invention, reference is
made to various patent applications and publications, each of which
are herein incorporated by reference in their entirety.
* * * * *