U.S. patent application number 10/521538 was filed with the patent office on 2006-07-27 for 2,5-disubstituted pyrimidine derivatives.
Invention is credited to Achim Feurer, Gerhard Konig, Joachim Luithle, Rudy Schreiber, Elke Stahl, Johannes-Peter Stasch, Stephan-Nicholas Wirtz, Frank Wunder.
Application Number | 20060167016 10/521538 |
Document ID | / |
Family ID | 30010152 |
Filed Date | 2006-07-27 |
United States Patent
Application |
20060167016 |
Kind Code |
A1 |
Feurer; Achim ; et
al. |
July 27, 2006 |
2,5-DISUBSTITUTED PYRIMIDINE DERIVATIVES
Abstract
The present invention relates to novel 2,5-disubstituted
pyrimidine derivatives which stimulate soluble guanylate cyclase,
to processes for the preparation thereof, and to the use thereof
for producing medicaments, in particular medicaments for the
treatment of central nervous system diseases.
Inventors: |
Feurer; Achim;
(Wilhelmsfeld, DE) ; Luithle; Joachim; (Wulfrath,
DE) ; Wirtz; Stephan-Nicholas; (Wuppertal, DE)
; Konig; Gerhard; (Arlington, MA) ; Stasch;
Johannes-Peter; (Solingen, DE) ; Stahl; Elke;
(Gladbach, DE) ; Schreiber; Rudy; (Menlo Park,
CA) ; Wunder; Frank; (Wuppertal, DE) |
Correspondence
Address: |
Bayer Pharmaceuticals Corporation
400 Morgan Lane
West Haven
CT
06516
US
|
Family ID: |
30010152 |
Appl. No.: |
10/521538 |
Filed: |
July 7, 2003 |
PCT Filed: |
July 7, 2003 |
PCT NO: |
PCT/EP03/07238 |
371 Date: |
August 1, 2005 |
Current U.S.
Class: |
514/256 ;
544/333 |
Current CPC
Class: |
C07D 471/04 20130101;
A61P 25/00 20180101; A61P 25/28 20180101; A61P 43/00 20180101 |
Class at
Publication: |
514/256 ;
544/333 |
International
Class: |
A61K 31/506 20060101
A61K031/506; C07D 471/02 20060101 C07D471/02 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 18, 2002 |
DE |
10232572.3 |
Claims
1. A compound of the formula ##STR106## in which R.sup.1 is
C.sub.6-C.sub.10-aryl or 5- to 10-membered heteroaryl which are
optionally substituted by radicals selected from the group of
halogen, cyano, C.sub.1-C.sub.6-alkoxy,
C.sub.1-C.sub.6-alkoxycarbonyl, trifluoromethyl,
2,2,2-trifluoroethyl, trifluoromethoxy, C.sub.1-C.sub.4-alkyl and
C.sub.3-C.sub.8-cycloalkyl, where C.sub.1-C.sub.4-alkyl is
optionally substituted by hydroxy, or a group of the formula
##STR107## or 4 to 12-membered heterocyclyl which is bonded via a
nitrogen atom and which is optionally substituted by radicals
selected from the group of --NHR.sup.2, halogen,
C.sub.1-C.sub.6-alkoxycarbonyl, C.sub.1-C.sub.6-alkoxy,
C.sub.1-C.sub.6-alkyl and oxo, where C.sub.1-C.sub.6-alkyl is
optionally substituted by hydroxy, and R.sup.2 is
C.sub.1-C.sub.4-alkyl, or C.sub.4-C.sub.8-cycloalkyl which is
substituted in the position adjacent to the point of attachment by
oxo, and which is optionally substituted by C.sub.1-C.sub.4-alkyl,
or a salt thereof.
2. The compound as claimed in claim 1, where R.sup.1 is phenyl or
5- to 6-membered heteroaryl, which are optionally substituted by
radicals selected from the group of fluorine, chlorine, cyano,
C.sub.1-C.sub.3-alkoxycarbonyl C.sub.1-C.sub.3-alkoxy,
trifluoromethyl, 2,2,2-trifluoroethyl, trifluoromethoxy,
C.sub.1-C.sub.3-alkyl and C.sub.3-C.sub.5-cycloalkyl, where
C.sub.1-C.sub.3-alkyl is optionally substituted by hydroxy, or a
group of the formula ##STR108## or 4- to 12-membered heterocyclyl
which is bonded via a nitrogen atom and which is optionally
substituted by radicals selected from the group of --NHR.sup.2,
fluorine, chlorine, C.sub.1-C.sub.3-alkyl,
C.sub.1-C.sub.3-alkoxycarbonyl, C.sub.1-C.sub.3-alkoxy and oxo,
where C.sub.1-C.sub.3-alkyl is optionally substituted by hydroxy,
and R.sup.2 is C.sub.1-C.sub.3-alkyl, or cyclohexyl which is
substituted in the position adjacent to the point of attachment by
oxo, and which is optionally substituted by C.sub.1-C.sub.2-alkyl,
or a salt thereof.
3. The compound as claimed in claim 1 or 2, where R.sup.1 is phenyl
or pyridyl, pyrazolyl, isoxazolyl, which are optionally substituted
by radicals selected from the group of fluorine, chlorine, cyano,
methoxy, methoxycarbonyl, ethoxycarbonyl, trifluoromethyl,
2,2,2-trifluoroethyl, trifluoromethoxy, methyl, cyclopropyl or
hydroxymethyl, or a group of the formula ##STR109## or 4- to
12-membered heterocyclyl which is bonded via a nitrogen atom and
which is optionally substituted by radicals selected from the group
of --NHR.sup.2, fluorine, chlorine, C.sub.1-C.sub.3-alkyl, methoxy,
ethoxy, hydroxymethyl and oxo, and R.sup.2 is methyl, or cyclohexyl
which is substituted in the position adjacent to the point of
attachment by oxo, and which is optionally substituted by methyl,
or a salt thereof.
4. A process for preparing compounds of the formula (IV), (VI) and
(VII), characterized in that either [A] compounds of the formula
##STR110## in which X is chlorine, bromine, iodine, are reacted
with a compound of the formula R.sup.3--NH--R.sup.4 in which
R.sup.3, R.sup.4 together with the nitrogen atom to which they are
bonded are a 4- to 12-membered heterocyclyl which is optionally
substituted by radicals selected from the group of --NHR.sup.2,
halogen, C.sub.1-C.sub.6-alkoxycarbonyl, C.sub.1-C.sub.6-alkoxy,
C.sub.1-C.sub.6-alkyl and oxo, where C.sub.1-C.sub.6-alkyl is
optionally substituted by --OR.sup.5, and R.sup.2 has the meaning
indicated in claim 1, R.sup.5 is a hydroxy protective group in an
inert solvent in the presence of a base and of a transition metal
catalyst to give compounds of the formula ##STR111## or [B]
compounds of the formula (II) are reacted with a compound of the
formula ##STR112## in which R.sup.6 is cycloalkyl, R.sup.7 is
hydrogen or R.sup.6 and R.sup.7 together with the CH.sub.2CO group
to which they are bonded are cycloalkyl which may be substituted by
C.sub.1-C.sub.6-alkyl radicals, in an inert solvent in the presence
of a base and of a transition metal catalyst to give compounds of
the formula ##STR113## or [C] compounds of the formula (II) are
reacted with a compound of the formula A-R.sup.8 (VII), in which A
is --B(OR.sup.9).sub.2 or --Sn(C.sub.1-C.sub.6-alkyl).sub.3, where
R.sup.9 is hydrogen, C.sub.1-C.sub.6-alkyl) or two radicals
together form a --CH.sub.2CH.sub.2-- or
(CH.sub.3).sub.2C--C(CH.sub.3).sub.2-- bridge, and R.sup.8 is
C.sub.6-C.sub.10-aryl or 5- to 10-membered heteroaryl which are
optionally substituted by radicals selected from the group of
halogen, cyano, C.sub.1-C.sub.6-alkoxy,
C.sub.1-C.sub.6-alkoxycarbonyl, trifluoromethyl.
2,2,2-trifluoroethyl, trifluoromethoxy, C.sub.1-C.sub.4-alkyl and
C.sub.3-C.sub.8-cycloalkyl, where C.sub.1-C.sub.4-alkyl is
optionally substituted by hydroxy, or a group of the formula
##STR114## in an inert solvent in the presence of a base and of a
transition metal catalyst to give compounds of the formula
##STR115## and the resulting compounds of the formula (IV), (VI)
and (VIM) are optionally reacted with the appropriate (i) solvents
and/or (ii) bases or acids to give the salt.
5. (canceled)
6. A medicament comprising at least one of the compounds as claimed
in claim 1 mixed together with at least one pharmaceutically
acceptable, essentially nontoxic carrier or excipient.
7. (canceled)
8. A method for the treatment of disorders of learning and/or
memory comprising administering to a human or animal an effective
amount of a compound of claim 1.
9. (canceled)
10. A method for the treatment of learning and/or memory diseases
comprising administering to a human or animal an effective amount
of a medicament of claim 6.
11. A method for controlling disorders of learning and/or memory in
humans or animals comprising administering to a human or animal an
effective amount of a compound of claim 1.
12. The process of claim 4, wherein X is bromine.
Description
[0001] The present invention relates to novel 2,5-disubstituted
pyrimidine derivatives which stimulate soluble guanylate cyclase,
to processes for the preparation thereof, and to the use thereof
for producing medicaments, in particular medicaments for the
treatment of disorders of the central nervous system.
[0002] One of the most important cellular signal transmission
systems in mammalian cells is cyclic guanosine monophosphate
(cGMP). Together with nitric oxide (NO), which is released from the
endothelium and transmits hormonal and mechanical signals, it forms
the NO/cGMP system. Guanylate cyclases catalyze the biosynthesis of
cGMP from guanosine triposphate (GTP). The representatives of this
family disclosed to date can be divided both according to
structural features and according to the type of ligands into two
groups: the particulate guanylate cyclases which can be stimulated
by natriuretic peptides, and the soluble guanylate cyclases which
can be stimulated by NO. The soluble guanylate cyclases consist of
two subunits and contain at least one heme per heterodimer. The
heme groups are part of the regulatory site and are of central
importance for the mechanism of activation. NO is able to bind to
the iron atom of heme and thus markedly increase the activity of
the enzyme. Heme-free preparations cannot, by contrast, be
stimulated by NO. CO is also able to attach to the central iron
atom of heme, but the stimulation by CO is distinctly less than
that by NO.
[0003] Through the production of cGMP and the regulation, resulting
therefrom, of phosphodiesterases, ion channels and protein kinases,
guanylate cyclase plays a crucial part in various physiological
processes, in particular in the relaxation and proliferation of
smooth muscle cells, in platelet aggregation and adhesion and in
neuronal signal transmission, and in disorders caused by an
impairment of the aforementioned processes. Under
pathophysiological conditions, the NO/cGMP system may be
suppressed. In Alzheimers patients for example the NO-stimulated
activity of soluble guanylate cyclase in the brain (cerebral
cortex) is greatly reduced.
[0004] A reduced learning behavior can be observed in experimental
animals on administration of dizocilpine, which leads to a reduced
cGMP level (Yamada et al., Neuroscience 74 (1996), 365-374). This
impairment can be abolished by injecting 8-Br-cGMP, a
membrane-permeable form of cGMP. This is consistent with
investigations showing that the cGMP level in the brain is
increased after learning and memory tasks.
[0005] A possible treatment which is independent of NO and aims at
influencing the cGMP signal pathway in organisms is a promising
approach for stimulating soluble guanylate cyclase because of the
high efficiency and few side effects which are to be expected.
[0006] Compounds, such as organic nitrates, whose effect is based
on release of NO have to date been exclusively used for the
therapeutic stimulation of soluble guanylate cyclase. NO is
produced by bioconversion and activates soluble guanylate cyclase
by binding to the central iron atom of heme. Besides the side
effects, the development of tolerance is one of the crucial
disadvantages of this mode of treatment.
[0007] Substances which directly stimulate soluble guanylate
cyclase, i.e. without previous release of NO, have been described
in recent years, such as, for example,
3-(5'-hydroxymethyl-2'-furyl)-1-benzylindazole (YC-1, Wu et al.,
Blood 84 (1994), 4226; Mjilsch et al., Br. J. Pharmacol. 120
(1997), 681), fatty acids (Goldberg et al, J. Biol. Chem. 252
(1977), 1279), diphenyliodonium hexafluorophosphate (Pettibone et
al., Eur. J. Pharmacol. 116 (1985), 307), isoliquiritigenin (Yu et
al., Brit. J. Pharmacol. 114 (1995), 1587) and various substituted
pyrazole derivatives (WO 98/16223).
[0008] In addition, WO 98/16507, WO 98/23619, WO 00/06567, WO
00/06568, WO 00/06569, WO 00/21954, WO 02/4229, WO 02/4300, WO
02/4301 and WO 02/4302 describe pyrazolopyridine derivatives as
stimulators of soluble guanylate cyclase. Also described in these
patent applications are pyrazolopyridines having various radicals.
Compounds of this type have very high in vitro activity in relation
to stimulating soluble guanylate cyclase. However, it has emerged
that these compounds have some disadvantages in respect of their in
vivo properties such as, for example, their behavior in the liver,
their pharmacokinetic behavior, their dose-response relation or
their metabolic pathway.
[0009] It was therefore the object of the present invention to
provide further pyrimidine derivatives which act as stimulators of
soluble guanylate cyclase but do not have the disadvantages,
detailed above, of the compounds from the prior art. An additional
advantage of novel medicaments for the treatment of disorders of
the central nervous system (e.g. learning and memory impairments)
would be an increased selectivity for peripheral cardiovascular
effects. It was likewise intended to improve these (e.g. by better
brain penetration) compared with the prior art.
[0010] This object is achieved according to the present invention
by the compounds claimed in claim 1.
[0011] Specifically, the present invention relates to the compounds
of the formula ##STR1## in which [0012] R.sup.1 is
C.sub.6-C.sub.10-aryl or 5- to 10-membered heteroaryl which are
optionally substituted by radicals selected from the group of
halogen, cyano, C.sub.1-C.sub.6-alkoxy,
C.sub.1-C.sub.6-alkoxycarbonyl, trifluoromethyl,
2,2,2-trifluoroethyl, trifluoromethoxy, C.sub.1-C.sub.4-alkyl and
C.sub.3-C.sub.8-cycloalkyl, where C.sub.1-C.sub.4-alkyl is
optionally substituted by hydroxy, [0013] or a group of the formula
##STR2## [0014] or [0015] 4- to 12-membered heterocyclyl which is
bonded via a nitrogen atom and which is optionally substituted by
radicals selected from the group of --NHR.sup.2, halogen,
C.sub.1-C.sub.6-alkoxycarbonyl, C.sub.1-C.sub.6-alkoxy,
C.sub.1-C.sub.6-alkyl and oxo, where C.sub.1-C.sub.6-alkyl is
optionally substituted by hydroxy, and [0016] R.sup.2 is
C.sub.1-C.sub.4-alkyl, or [0017] C.sub.4-C.sub.8-cycloalkyl which
is substituted in the position adjacent to the point of attachment
by oxo, and which is optionally substituted by
C.sub.1-C.sub.4-alkyl, and the salts, solvates and/or solvates of
the salts thereof.
[0018] Where asymmetric C atoms are present in R.sup.1, the
compounds of the invention can be in the form of enantiomers,
diastereomers or mixtures thereof. These mixtures can be separated
in a known manner into the stereoisomerically pure
constituents.
[0019] Salts preferred for the purposes of the invention are
physiologically acceptable salts of the compounds of the
invention.
[0020] Physiologically acceptable salts of the compounds according
to the invention may be acid addition salts of the compounds with
mineral acids, carboxylic acids or sulfonic acids. Particularly
preferred examples are salts with hydrochloric acid, hydrobromic
acid, sulfuric acid, phosphoric acid, methanesulfonic acid,
ethanesulfonic acid, p-toluenesulfonic acid, benzenesulfonic acid,
naphthalenedisulfonic acid, acetic acid, propionic acid, lactic
acid, tartaric acid, citric acid, fumaric acid, maleic acid or
benzoic acid.
[0021] Physiologically acceptable salts may also be salts with
usual bases, such as, for example, alkali metal salts (e.g. sodium
or potassium salts), alkaline earth metal salts (e.g. calcium or
magnesium salts) or ammonium salts derived from ammonia or organic
amines such as, for example, diethylamine, triethylamine,
ethyldiisopropylamine, procaine, dibenzylamine, N-methylmorpholine,
dihydroabiethylamine, 1-ephenamine or methylpiperidine.
[0022] Solvates of the compounds of the invention are for the
purposes of the invention stoichiometric compositions of the
compounds or of their salts with solvents, e.g. water, ethanol.
[0023] For the purposes of the present invention, the substituents
generally have the following meaning:
[0024] C.sub.1-C.sub.6-alkyl is a straight-chain or branched alkyl
radical having 1 to 6 carbon atoms. Preference is given to a
straight-chain or branched alkyl radical having 1 to 4,
particularly preferably having 1 to 3, carbon atoms. Nonlimiting
examples include methyl, ethyl, n-propyl, isopropyl, tert-butyl,
n-pentyl and n-hexyl.
[0025] C.sub.1-C.sub.6-alkoxy is a straight-chain or branched
alkoxy radical having 1 to 6 carbon atoms. Preference is given to a
straight-chain or branched alkoxy radical having 1 to 4,
particularly preferably having 1 to 3, carbon atoms. Nonlimiting
examples include methoxy, ethoxy, n-propoxy, isopropoxy,
tert-butoxy, n-pentoxy and n-hexoxy.
[0026] C.sub.1-C.sub.6-alkoxycarbonyl is a straight-chain or
branched alkoxycarbonyl radical having 1 to 6 carbon atoms.
Preference is given to a straight-chain or branched alkoxycarbonyl
radical having 1 to 4, particularly preferably having 1 to 3,
carbon atoms. Nonlimiting examples include methoxycarbonyl,
ethoxycarbonyl, n-propoxycarbonyl, isopropoxycarbonyl and
tert-butoxycarbonyl.
[0027] C.sub.6-C.sub.10-aryl is an aromatic radical having 6 to 10
carbon atoms. Nonlimiting examples include phenyl and naphthyl.
[0028] C.sub.3-C.sub.8-cycloalkyl is cyclopropyl, cyclopentyl,
cyclobutyl, cyclohexyl, cycloheptyl or cyclooctyl. Nonlimiting
examples include cyclopropyl, cyclopentyl and cyclohexyl.
[0029] Halogen is fluorine, chlorine, bromine and iodine. Fluorine,
chlorine and bromine are preferred. Fluorine and chlorine are
particularly preferred.
[0030] 5- to 10-membered heteroaryl is an aromatic, mono- or
bicyclic radical having 5 to 10 ring atoms and up to 5 heteroatoms
from the series S, O and/or N. 5- to 6-membered heteroaryls having
up to 4 heteroatoms are preferred. The heteroaryl radical may be
bonded via a carbon atom or nitrogen atom. Nonlimiting examples
include thienyl, furyl, pyrrolyl, thiazolyl, oxazolyl, imidazolyl,
pyridyl, pyrimidyl, pyridazinyl, indolyl, indazolyl, isoxazyl,
benzofuranyl, benzothiophenyl, quinolinyl, isoquinolinyl.
[0031] 4- to 12-membered heterocyclyl is a mono- or polycyclic
heterocyclic radical having 4 to 12 ring atoms and up to 3,
preferably 2, heteroatoms or hetero groups from the series N, O, S,
SO, SO.sub.2. 4- to 8-membered heterocyclyl is preferred. Mono- or
bicyclic heterocyclyl is preferred. N and O are preferred as
heteroatoms. The heterocyclyl radicals may be saturated or
partially unsaturated. Saturated heterocyclyl radicals are
preferred. Nonlimiting examples include oxetan-3-yl,
pyrrolidin-2-yl, pyrrolidin-3-yl, pyrrolinyl, tetrahydrofuranyl,
tetrahydrothienyl, pyranyl, piperidinyl, thiopyranyl, morpholinyl,
perhydroazepinyl, 9-oxa-3,7-diazabicyclo[3.3.1]nonanyl,
1-oxa-4,7-diazaspiro[5.4]decanyl,
10-oxa-4-azatricyclo[5.2.1.0.sup.2,6]decanyl,
10-oxa-4-azatricyclo[5.2.1.0.sup.2,6]decanyl,
decahydropyrrolo[3,4-b]pyrrolizidinyl,
2,5-diazabicyclo[2.2.1]heptanyl, 8-oxa-3-azabicyclo[3.2.1]octanyl,
octahydropyrrolo[3,4-d][1,3]oxazinyl.
[0032] Where the radicals in the compounds of the invention are
substituted, the radicals may, unless otherwise specified, have one
or more identical or different substituents. Substitution by up to
three identical or different substituents is preferred.
Substitution by one substituent is very particularly preferred.
[0033] Combinations of two or more of the preferred ranges
mentioned above are very particularly preferred.
[0034] A further embodiment of the invention relates to compounds
of the formula (I)
where
[0035] R.sup.1 is phenyl or 5- to 6-membered heteroaryl which are
optionally substituted by radicals selected from the group of
fluorine, chlorine, cyano, C.sub.1-C.sub.3-alkoxycarbonyl,
C.sub.1-C.sub.3-alkoxy, trifluoromethyl, 2,2,2-trifluoroethyl,
trifluoromethoxy, C.sub.1-C.sub.3-alkyl and
C.sub.3-C.sub.5-cycloalkyl, where C.sub.1-C.sub.3-alkyl is
optionally substituted by hydroxy, [0036] or a group of the formula
##STR3## or [0037] 4- to 12-membered heterocyclyl which is bonded
via a nitrogen atom and which is optionally substituted by radicals
selected from the group of --NHR.sup.2, fluorine, chlorine,
C.sub.1-C.sub.3-alkyl, C.sub.1-C.sub.3-alkoxycarbonyl,
C.sub.1-C.sub.3-alkoxy and oxo, where C.sub.1-C.sub.3-alkyl is
optionally substituted by hydroxy, and [0038] R.sup.2 is
C.sub.1-C.sub.3-alkyl, or [0039] cyclohexyl which is substituted in
the position adjacent to the point of attachment by oxo, and which
is optionally substituted by C.sub.1-C.sub.2-alkyl, and the salts,
solvates and/or solvates of the salts thereof.
[0040] A further embodiment of the invention relates to compounds
of the formula (I)
where
[0041] R.sup.1 is phenyl or pyridyl, pyrazolyl, isoxazolyl, which
are optionally substituted by radicals selected from the group of
fluorine, chlorine, cyano, methoxy, methoxycarbonyl,
ethoxycarbonyl, trifluoromethyl, 2,2,2-trifluoroethyl,
trifluoromethoxy, methyl, cyclopropyl or hydroxymethyl, [0042] or a
group of the formula ##STR4## or [0043] 4- to 12-membered
heterocyclyl which is bonded via a nitrogen atom and which is
optionally substituted by radicals selected from the group of
--NHR.sup.2, fluorine, chlorine, C.sub.1-C.sub.3-alkyl, methoxy,
ethoxy, hydroxymethyl and oxo, and [0044] R.sup.2 is methyl, or
[0045] cyclohexyl which is substituted in the position adjacent to
the point of attachment by oxo, and which is optionally substituted
by methyl, and the salts, solvates and/or solvates of the salts
thereof.
[0046] The invention further relates to processes for preparing the
compounds of the invention, in which either [A] compounds of the
formula ##STR5## in which X is chlorine, bromine, iodine,
preferably bromine, are reacted with a compound of the formula
[0047] (III), R.sup.3--NH--R.sup.4 (III), in which [0048] R.sup.3,
R.sup.4 together with the nitrogen atom to which they are bonded,
4- to 12-membered heterocyclyl which is optionally substituted by
radicals selected from the group of --NHR.sup.2, halogen,
C.sub.1-C.sub.6-alkoxycarbonyl, C.sub.1-C.sub.6-alkoxy,
C.sub.1-C.sub.6-alkyl and oxo, where C.sub.1-C.sub.6-alkyl is
optionally substituted by --OR.sup.5, and R.sup.2 has the meaning
indicated above, R.sup.5 is a hydroxy protective group, preferably
tri-(C.sub.1-C.sub.6-alkyl)silyl, in an inert solvent in the
presence of a base and of a transition metal catalyst to give
compounds of the formula ##STR6## or [B] compounds of the formula
(II) are reacted with a compound of the formula ##STR7## in which
[0049] R.sup.6 is cycloalkyl, R.sup.7 is hydrogen or R.sup.6 and
R.sup.7 together with the CH.sub.2CO group to which they are bonded
are cycloalkyl which may be substituted by C.sub.1-C.sub.6-alkyl
radicals, in an inert solvent in the presence of a base and of a
transition metal catalyst to give compounds of the formula ##STR8##
or [C] compounds of the formula (II) are reacted with a compound of
the formula A-R.sup.8 (VII), in which [0050] A is
--B(OR.sup.9).sub.2 or --Sn(C.sub.1-C.sub.6-alkyl).sub.3, where
[0051] R.sup.9 is hydrogen, C.sub.1-C.sub.6-alkyl or two radicals
together form a --CH.sub.2CH.sub.2-- or
--(CH.sub.3).sub.2C--C(CH.sub.3).sub.2-- bridge, and [0052] R.sup.8
is C.sub.6-C.sub.10-aryl or 5- to 10-membered heteroaryl which are
optionally substituted by radicals selected from the group of
halogen, cyano, C.sub.1-C.sub.6-alkoxy,
C.sub.1-C.sub.6-alkoxycarbonyl, trifluoromethyl,
2,2,2-trifluoroethyl, trifluoromethoxy, C.sub.1-C.sub.4-alkyl and
C.sub.3-C.sub.8-cycloalkyl, where C.sub.1-C.sub.4-alkyl is
optionally substituted by hydroxyl, [0053] or a group of the
formula ##STR9## [0054] in an inert solvent in the presence of a
base and of a transition metal catalyst to give compounds of the
formula ##STR10## and the resulting compounds of the formula (I),
(IV), (VI) and (VIII) are reacted where appropriate with the
appropriate (i) solvents and/or (ii) bases or acids to give the
solvates, salts or solvates of the salts thereof.
[0055] Preference is given to carrying out processes [A] and [B] of
the invention in a temperature range from 20 to 100.degree. C. and
process [C] of the invention from 20 to 150.degree. C. under
atmospheric pressure.
[0056] Examples of inert solvents are ethers such as dioxane,
tetrahydrofuran or 1,2-dimethoxyethane, hydrocarbons such as
benzene, xylene or toluene, nitroaromatics such as nitrobenzene,
optionally N-alkylated carboxamides such as dimethylformamide,
dimethylacetamide, alkyl sulfoxides such as dimethyl sulfoxide or
lactams such as N-methylpyrrolidone. Solvents from the series
dimethylformamide, 1,2-dimethoxyethane, toluene and dioxane are
preferred.
[0057] Examples of bases are alkali metal alcoholates such as, for
example, sodium or potassium tert-butoxide or alkali metal
carbonates such as cesium carbonate, sodium or potassium carbonate
or alkali metal hydrides such as sodium or potassium hydride.
[0058] Transition metal catalysts may preferably be palladium(0) or
palladium(II) compounds which can be employed preformed, such as,
for example, bis(diphenylphosphaneferrocenyl)palladium(II)
chloride, dichlorobis(triphenylphosphine)palladium or be generated
in situ from a suitable palladium source such as, for example,
bis(dibenzylideneacetone)palladium(0) or
tetrakistriphenylphosphinepalladium(0) and a suitable phosphine
ligand. It is particularly preferred to employ
2,2'-bis(diphenylphosphino)-1,1'-binaphthalene (BINAP) as phosphine
ligand.
[0059] The transition metal-catalyzed reactions can be carried out
in analogy to processes known from the literature, e.g. reaction
with alkynes; cf. N. Krause et al., J. Org. Chem. 1998, 63, 8551;
with ketones, aromatics and alkenes; cf., for example, A. Suzuki,
Acc. Chem. Res. 1982, 15, 178ff; Miyaura et al. J. Am. Chem. Soc.
1989, 111, 314; J. K. Stille, Angew. Chem. 1986, 98, 504 and with
substituted amines: cf. S. L. Buchwald et al., J. Organomet. Chem.
1999, 576, 125ff. (see also J. Tsuji, Palladium Reagents and
Catalysts, Wiley, New York, 1995).
[0060] The process of the invention can be illustrated by the
following synthesis scheme. ##STR11##
[0061] Functional groups can, where appropriate, be protected with
suitable protective groups which can subsequently be eliminated
again (cf., for example, T. W. Greene, P. Wuts, "Protective Groups
in Organic Synthesis", 2nd edition, Wiley; New York, 1991).
[0062] The compounds of the formulae (IV), (VI) and (VII) can be
converted by deprotection of functional groups and where
appropriate a subsequent derivatization by known processes for
alkylation, oxidation, reduction, etherification into the compounds
of the formula (I) of the invention, which are reacted where
appropriate with the appropriate (i) solvents and/or (ii) bases or
acids to give the solvates, salts or solvates of the salts thereof.
This is to be illustrated by the following synthesis scheme based
on an example (deprotection, alkylation). ##STR12##
[0063] Compounds of the formula (II) can be prepared by reacting
compound of the formula ##STR13## in which X has the meaning
indicated above, with a compound of the formula ##STR14##
[0064] The compounds of the formula (III), (V), (VII) and (IX) are
commercially available, known or can be prepared by known
processes.
[0065] The compound of the formula (X) is disclosed in WO
00/06569.
[0066] The compounds of the invention show a valuable range of
pharmacological effects which could not have been predicted.
[0067] The compounds of the invention increase the cGMP levels in
neurons and thus represent active ingredients for controlling
central nervous system diseases characterized by disturbances of
the NO/cGMP system. They are suitable in particular for improving
perception, concentration, learning or memory after cognitive
impairments like those occurring in particular in association with
situations/diseases/syndromes such as mild cognitive impairment,
age-associated learning and memory impairments, age-associated
memory losses, vascular dementia, craniocerebral trauma, stroke,
dementia occurring after strokes (post stroke dementia),
post-traumatic cranial cerebral trauma, general concentration
impairments, concentration impairments in children with learning
and memory problems, Alzheimer's disease, Lewy body dementia,
dementia with degeneration of the frontal lobes including Pick's
syndrome, Parkinson's disease, progressive nuclear palsy, dementia
with corticobasal degeneration, amyolateral sclerosis (ALS),
Huntington's disease, multiple sclerosis, thalamic degeneration,
Creutzfeld-Jacob dementia, HIV dementia, schizophrenia with
dementia or Korsakoff's psychosis.
[0068] The compounds of the invention also lead to vasorelaxation,
platelet aggregation inhibition and to a reduction in blood
pressure, and to an increase in the coronary blood flow. These
effects are mediated by direct stimulation of soluble guanylate
cyclase and an intracellular cGMP increase. In addition, the
compounds of the invention may enhance the effect of substances
which increase the cGMP level, such as, for example, EDRF
(endothelium derived relaxing factor), NO donors, protoporphyrin
IX, arachidonic acid or phenylhydrazine derivatives.
[0069] They can therefore be employed in medicaments for the
treatment of cardiovascular disorders such as, for example, for the
treatment of high blood pressure and heart failure, stable and
unstable angina pectoris, peripheral and cardiac vascular
disorders, of arrhythmias, for the treatment of thromboembolic
disorders and ischemias such as myocardial infarction, stroke,
transistorily and ischemic attacks, disturbances of peripheral
blood flow, prevention of restenoses as after thrombolysis
therapies by use in stents for example, percutaneously transluminal
angioplasties (PTAs), percutaneously transluminal coronary
angioplasties (PTCAs), bypass operations and for the treatment of
arteriosclerosis, asthmatic disorders, osteoporosis, gastroparesis,
glaucoma and diseases of the urogenital system such as, for
example, incontinence, prostate hypertrophy, erectile dysfunction
and female sexual dysfunction.
[0070] They are also suitable for the treatment of central nervous
system disorders such as states of anxiety, tension and depression,
CNS-related sexual dysfunctions and sleep disturbances, and for
controlling pathological disturbances of the intake of food,
stimulants and addictive substances.
[0071] The compounds of the invention are additionally suitable for
controlling cerebral blood flow and may represent effective agents
for controlling migraine.
[0072] They are also suitable for the prophylaxis and control of
the sequelae of cerebral infarctions such as stroke, cerebral
ischemias and craniocerebral trauma. The compounds of the invention
can likewise be employed for controlling states of pain.
[0073] In addition, the compounds of the invention have an
anti-inflammatory effect.
[0074] Furthermore, the invention encompasses the combination of
the compounds of the invention with organic nitrates and NO
donors.
[0075] Organic nitrates and NO donors for the purposes of the
invention are generally substances which release NO or NO
precursors. Preference is given to sodium nitroprusside,
nitroglycerine, isosorbide dinitrate, isosorbide mononitrate,
molsidomine and SIN-1.
[0076] In addition, the invention encompasses the combination with
compounds which inhibit breakdown of cyclic guanosine monophosphate
(cGMP). These are in particular inhibitors of phosphodiesterases 1,
2 and 5; nomenclature of Beavo and Reifsnyder (1990), TiPS 11 pp.
150 to 155. These inhibitors potentiate the effect of the compound
of the invention, and the desired pharmacological effect is
increased.
[0077] The in vitro effect of the compounds of the invention can be
shown in the following assays:
Increase of cGMP in Primary Cortical Neurons
[0078] Rat embryos (embryonic day 17-19) are decapitated, and the
cerebrum is removed and incubated with 5 ml of papain solution and
250 .mu.l of DNAse (papain kit from Cell-System) at 37.degree. C.
for 30 min, homogenized using a Pasteur pipette and centrifuged at
1200 rpm for 5 min. The supernatant is removed, the cell pellet
resuspended (in 2.7 ml of EBSS [Earl's balanced salt solution], 300
.mu.l of ovomucoid/albumin (conc.) solution, 150 .mu.l of DNAse;
papain kit from Cell-System), layered over 5 ml of
ovomucoid/albumin solution and centrifuged at 700 rpm for 6 min.
The supernatant is removed, the cells are resuspended in
cultivation medium (Gibco neurobasal medium, B27 Supplement
50.times.1 ml/100 ml, 2 mM L-glutamine), counted (approx. 150 000
cells/well) and plated out on poly-D-lysine-coated 96-well plates
(Costar) with 200 .mu.l/well. After 6-7 days at 37.degree. C. (5%
CO.sub.2), the neurons are freed of culture medium and washed once
with assay buffer (154 mM NaCl, 5.6 mM KCl, 2.3 mM
CaCl.sub.2.2H.sub.20, 1 mM MgCl.sub.2, 5.6 mM glucose, 8.6 mM HEPES
(4-(2-hydroxyethyl)piperazine-1-ethanesulfonic acid), pH=7.4). 100
.mu.l/well test substance are dissolved in assay buffer and then
100 .mu.l/well IBMX (3-isobutyl-1-methylxanthine; dissolved in 50
mM ethanol, diluted with assay buffer to a final concentration of
100 .mu.M) are added. After incubation at 37.degree. C. for 20 min,
the assay buffer is replaced by 200 .mu.l/well of lysis buffer
(cGMP EIA RPN 226 from Amersham Pharmacia Biotech), and the cGMP
content of the lystates is determined using an EIA assay kit.
[0079] The concentrations indicated in Table 1 lead to a
statistically significant increase in cGMP (triplicate
determination; more than 2-fold increase compared with the control)
TABLE-US-00001 TABLE 1 Example .mu.M 3 0.90 6 0.27 10 1.2 11 0.30
13 0.27 19 0.27 20 0.27 27 0.90 36 0.27 38 0.27
Vasorelaxant Effect In Vitro
[0080] Rabbits are stunned by a blow to the back of the neck and
are exsanguinated. The aorta is removed, freed of adherent tissue,
divided into rings 1.5 mm wide and put singly under tension in 5 ml
organ baths containing carbogen-gassed Krebs-Henseleit solution at
37.degree. C. with the following composition (mM): NaCl: 119; KCl:
4.8; CaCl.sub.2.times.2H.sub.2O: 1; MgSO.sub.4.times.7H.sub.2O:
1.4; KH.sub.2PO.sub.4: 1.2; NaHCO.sub.3: 25; glucose: 10. The force
of contraction is detected with Statham UC2 cells, amplified and
digitized via A/D converters (DAS-1802 HC, Keithley Instruments
Munich) and recorded in parallel on chart recorders. A contraction
is generated by adding phenylephrine to the bath cumulatively in
increasing concentration. After several control cycles, the
substance to be investigated (dissolved in 5 .mu.l of DMSO) is
investigated in each further run in increasing dosage in each case,
and the height of the contraction is compared with the height of
the contraction reached in the last control cycle (control value).
The concentration necessary to reduce the height of the control
value by 50% (IC.sub.50) is calculated from this.
Determination of the Liver Clearance In Vitro
[0081] Rats are anesthetized, heparinized, and the liver is
perfused in situ via the portal vein. Primary rat hepatocytes are
then obtained ex vivo from the liver using collagenase solution.
2.10.sup.6 hepatocytes per ml were incubated at 37.degree. C. with
the same concentration in each case of the compound to be
investigated. The decrease of the substrate to be investigated over
time was determined bioanalytically (HPLC/UV, HPLC/fluorescence or
LC/MSMS) at 5 points in time in each case in the period from 0-15
min after the start of incubation. From this, the clearance was
calculated by means of the cell count and liver weight.
Determination of the Plasma Clearance In Vivo
[0082] The substance to be investigated is administered as a
solution intravenously to rats via the tail vein. At fixed points
in time, blood is taken from the rats, heparinized and plasma is
obtained therefrom by conventional measures. The substance is
quantified bioanalytically in the plasma. The pharmacokinetic
parameters are calculated from the plasma concentration-time
courses determined in this way by means of conventional
non-compartmental methods used for this purpose.
[0083] The suitability of the compounds of the invention for the
treatment of disorders of perception, concentration, learning
and/or memory can be shown for example in the following animal
model:
Determination of the Learning and Memory in the Social Recognition
Test
[0084] Adult Wistar rats (Winkelmann, Borchen; 4-5 months) and
4-5-week old pups are accustomed to their new environment for one
week, with 3 animals being housed in each cage (Makrolon type IV)
in a 12 h day-night rhythm (light on at 06:00) with water and food
ad libitum. Usually, 4 groups of 10 animals (1 vehicle control
group, 3 substance-treated groups) are tested. Firstly, all animals
undergo a habituation run as in trial 1 but without substance or
vehicle administration. The test substances are administered
directly after trial 1. The social memory is measured in trial 2
after 24 h.
[0085] Trial 1: 30 min before testing, the adult rats are housed
singly in cages (Makrolon type IV). 4 min before testing, a box
consisting of two aluminum side walls, an aluminum back wall and a
Plexiglas front (63.times.41.times.40 cm) is fitted over the cage,
and the lid of the cage is removed. A pup is put with the adult
rats in the cage, and the social interaction (e.g. sniffing) is
timed for 2 min with a stopclock. The animals are then returned to
their cage.
[0086] Trial 2: The test is repeated with the same animals after 24
h in analogy to trial 1. The difference between the social
interaction time in trial 1 and trial 2 is taken as a measure of
the social memory.
[0087] The compounds of the invention are suitable for use as
medicaments for humans and animals.
[0088] The present invention includes pharmaceutical preparations
which, besides inert, nontoxic, pharmaceutically suitable
excipients and carriers, comprise one or more compounds of the
invention, or which consist of one or more compounds of the
invention, and processes for producing these preparations.
[0089] The compounds of the invention are to be present in these
preparations in a concentration of from 0.1 to 99.5% by weight,
preferably from 0.5 to 95% by weight, of the complete mixture.
[0090] The pharmaceutical preparations may, apart from the
compounds of the invention, also comprise other active
pharmaceutical ingredients.
[0091] The pharmaceutical preparations mentioned above can be
produced in a conventional way by known methods, for example with
the excipient(s) or carrier(s).
[0092] The novel active ingredients can be converted in a known
manner into the usual formulations such as tablets, coated tablets,
pills, granules, aerosols, syrups, emulsions, suspensions and
solutions, using inert, nontoxic, pharmaceutically suitable
carriers or solvent. In these cases, the therapeutically effective
compound is to be present in each case in a concentration of about
0.5 to 90% by weight of the complete mixture, i.e. in amounts which
are sufficient to achieve the indicated dosage range.
[0093] The formulations can be produced for example by diluting the
active ingredients with solvents and/or carriers, where appropriate
using emulsifiers and/or dispersants, it being possible for example
in the case where water is used as diluent where appropriate to use
organic solvents as auxiliary solvents.
[0094] Administration can take place in a conventional way,
preferably orally, transdermally or parenterally, in particular
perlingually or intravenously. However, it can also take place by
inhalation through the mouth or nose, for example with the aid of a
spray, or topically via the skin.
[0095] It has generally proved to be advantageous to administer
amounts of about 0.001 to 10 mg/kg, on oral administration
preferably about 0.005 to 3 mg/kg, of body weight achieve effective
results.
[0096] It may nevertheless be necessary where appropriate to
deviate from the stated amounts, in particular as a function of the
body weight or the nature of the administration route, the
individual response to the medicament, the nature of its
formulation and the time or interval over which administration
takes place. Thus, it may be sufficient in some cases to make do
with less than the aforementioned minimum amount, where in other
cases the stated upper limit must be exceeded. If larger amounts
are administered, it may be advisable to divide these into a
plurality of single doses over the day.
[0097] Abbreviations: TABLE-US-00002 ACN acetonitrile CI chemical
ionization (in MS) DCM dichloromethane DME 1,2-dimethoxyethane DMF
N,N-dimethylformamide DMSO dimethyl sulfoxide ESI electrospray
ionization (in MS) GC gas chromatography HPLC high pressure, high
performance liquid chromatography LC-MS liquid chromatography-mass
spectroscopy m.p. melting point MS mass spectroscopy NMR nuclear
magnetic resonsance spectroscopy rac-BINAP
rac-2,2-bis(diphenylphosphino)- 1,1-dinaphthyl R.sub.f retention
index (in TLC) RT room temperature, 20.degree. C. R.sub.t retention
time (in HPLC) TFA trifluoroacetic acid THF tetrahydrofuran
Analytical Methods: HPLC
[0098] Instrument: HP 1100 with DAD detection; column: Kromasil
RP-18, 60 mm.times.2 mm, 3.5 .mu.m; eluent: A=5 ml perchloric
acid/l H.sub.2O, B=ACN; gradient: 0 min 2% B, 0.5 min 2% B, 4.5 min
90% B, 6.5 min 90% B; flow rate: 0.75 ml/min; temp.: 30.degree. C.;
UV detection: 210 nm.
Preparative HPLC
[0099] Column: YMC GEL ODS-AQS-11 .mu.m, 250 mm.times.30 mm;
eluent: A=H.sub.2O, B=ACN; gradient: 0 min 10% B, 10 min 10% B, 35
min 100% B, 45 min 100% B; flow rate: 33 ml/min; temp.: about
22.degree. C.; UV detection: 254 nm.
LC/MS
Method A:
[0100] Instrument: Finnigan MAT 900S, TSP: P4000, AS3000, UV3000HR;
column: Symmetry C 18, 150 mm.times.2.1 mm, 5.0 .mu.m; eluent C:
water, eluent B: water+0.3 g of 35% hydrochloric acid, eluent A:
ACN; gradient: 0 min 2% A.fwdarw.2.5 min 95% A.fwdarw.5 min 95% A;
oven: 70.degree. C.; flow rate: 1.2 ml/min; UV detection: 210
nm.
Method B:
[0101] Instrument: Finnigan MAT 900S, TSP: P4000, AS3000, UV3000HR;
column: Symmetry C 18, 150 mm.times.2.1 mm, 5.0 .mu.m; eluent A:
acetonitrile, eluent B: water+0.6 g of 30% hydrochloric acid;
gradient: 0 min 10% A.fwdarw.4 min 90% A.fwdarw.9 min 90% A; oven:
50.degree. C.; flow rate: 0.6 ml/min; UV detection: 210 nm.
Method C:
[0102] Instrument: Micromass Quattro LCZ, HP 1100; column: Symmetry
C 18, 50 mm.times.2.1 mm, 3.5 .mu.m; eluent A: acetonitrile+0.1%
formic acid, eluent B: water+0.1% formic acid; gradient: 0 min 10%
A.fwdarw.4 min 90% A.fwdarw.6 min 90% A; oven: 40.degree. C.; flow
rate: 0.5 ml/min; UV detection: 208-400 nm.
Method D:
[0103] Instrument: Micromass Platform LCZ, HP 1100; column:
Symmetry C 18, 50 mm.times.2.1 mm, 3.5 .mu.m; eluent A:
acetonitrile+0.1% formic acid, eluent B: water+0.1% formic acid;
gradient: 0 min 10% A.fwdarw.4 min 90% A.fwdarw.6 min 90% A; oven:
40.degree. C.; flow rate: 0.5 ml/min; UV detection: 208-400 nm.
Method E:
[0104] Instrument: Finnigan MAT 900S, TSP: P4000, AS3000, UV3000HR;
column: Symmetry C 18, 150 mm.times.2.1 mm, 5.0 .mu.m; eluent A:
acetonitrile, eluent B: water+0.3 g of 30% hydrochloric acid;
gradient: 0 min 10% A.fwdarw.3 min 90% A.fwdarw.6 min 90% A; oven:
50.degree. C.; flow rate: 0.9 ml/min; UV detection: 210 nm.
[0105] GC/MS TABLE-US-00003 Carrier gas: Helium Flow rate: 1.5
ml/min Starting temperature: 60.degree. C. Temperature gradient:
14.degree. C./min up to 300.degree. C., then 1 min const.
300.degree. C. column: HP-5 30 m .times. 320 .mu.m .times. 0.25
.mu.m (film thickness) Starting time: 2 min Front injector temp.:
250.degree. C.
Starting Compounds:
EXAMPLE I
Step 1
Ethyl 5-amino-1-(2-fluorobenzyl)pyrazole-3-carboxylate
[0106] ##STR15##
[0107] 111.75 g (75 ml, 0.98 mol) of trifluoroacetic acid are added
to 100.00 g (0.613 mol) of the sodium salt of ethyl cyanopyruvate
(prepared in analogy to Borsche and Manteuffel, Liebigs Ann. 1934,
512, 97) while stirring efficiently in 2.5 l of dioxane at room
temperature under argon, and the mixture is stirred for 10 min,
during which most of the precursor dissolves. Then 85.93 g (0.613
mol) of 2-fluorobenzylhydrazine are added, and the mixture is
boiled overnight. After cooling, the sodium trifluoroacetate
crystals which have separated out are filtered off with suction and
washed with dioxane, and the remaining crude solution is reacted
further.
Step 2
Ethyl
1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridine-3-carboxylate
[0108] ##STR16##
[0109] The solution obtained in step 1 is mixed with 61.25 ml
(60.77 g, 0.613 mol) of dimethylaminoacrolein and 56.28 ml (83.88
g, 0.736 mol) of trifluoroacetic acid and boiled under argon for 3
days. The solvent is then evaporated in vacuo, and the residue is
poured into 2 l of water and extracted three times with 1 l of
ethyl acetate each time. The combined organic phases are dried with
magnesium sulfate and concentrated in vacuo. Chromatography is
carried out on 2.5 kg of silica gel, eluting with a
toluene/toluene-ethyl acetate=4:1 gradient.
[0110] Yield: 91.6 g (49.9% of theory over two stages).
[0111] M.p.: 85.degree. C.
[0112] R.sub.f (silica gel, toluene/ethyl acetate 1:1): 0.83
Step 3
1-(2-Fluorobenzyl)-1H-pyrazolo[3,4-b]pyridine-3-carboxamide
[0113] ##STR17##
[0114] 10.18 g (34 mmol) of the ester obtained in step 2 are
introduced into 150 ml of methanol saturated with ammonia at
0-10.degree. C. Stirring at room temperature for two days is
followed by concentration in vacuo.
[0115] R.sub.f (silica gel, toluene/ethyl acetate 1:1): 0.33
Step 4
3-Cyano-1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridine
[0116] ##STR18##
[0117] 36.1 g (133 mmol) of
1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridine-3-carboxamide from
step 3 are dissolved in 330 ml of THF, and 27 g (341 mmol) of
pyridine are added. Then, over the course of 10 min, 47.76 ml
(71.66 g, 341 mmol) of trifluoroacetic anhydride are added, during
which the temperature rises to 40.degree. C. The mixture is stirred
at room temperature overnight. The mixture is then poured into 1 l
of water and extracted three times with 0.5 l of ethyl acetate each
time. The organic phase is washed with saturated sodium bicarbonate
solution and with 1 N HCl, dried with MgSO.sub.4 and concentrated
in vacuo.
[0118] Yield: 33.7 g (100% of theory)
[0119] M.p.: 81.degree. C.
[0120] R.sub.f (silica gel, toluene/ethyl acetate 1:1): 0.74
Step 5
1-(2-Fluorobenzyl)-1H-pyrazolo[3,4-b]pyridine-3-carboximidamide
[0121] ##STR19##
[0122] 108.00 g (0.43 mol) of
1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridine-3-carbonitrile
(example I, step 4) are dissolved in one liter of methanol and
added dropwise to a solution of 94.73 g (1.67 mol; purity: 95%) of
sodium methoxide in 3 l of methanol. After stirring at RT for 2
hours, 28.83 g (0.54 mol) of ammonium chloride are added, and
subsequently 100.03 g (1.67 mol) of glacial acetic acid are added
dropwise. This solution is stirred under reflux overnight. The
solvent is removed in vacuo, the residue is twice suspended in
acetone and the insoluble solid is filtered off with suction. The
latter is dissolved in 1.5 l of ethyl acetate, and 590 ml of an
aqueous 20% strength sodium carbonate solution are added. Stirring
for 20 minutes is followed by dilution with 200 ml of 1N sodium
hydroxide solution. The organic phase is washed with saturated
aqueous sodium chloride solution, dried over magnesium sulfate and
filtered. The solvent is removed in vacuo. 99.10 g (86% of theory)
of the product are obtained.
[0123] LC/MS (method B): R.sub.t=2.25 min.
[0124] MS (ESIpos): m/z=270 (M+H).sup.+
[0125] .sup.1H-NMR (300 MHz, DMSO-d.sub.6): .delta.=5.79 (s, 2H),
6.54 (br s, 3H), 7.09-7.18 (m, 2H), 7.23 (t, 1H), 7.31-7.41 (m,
2H), 8.62 (d, 1H), 8.69 (d, 1H).
Step 6
3-(5-Bromo-2-pyrimidinyl)-1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridine
[0126] ##STR20##
[0127] 10.09 g (66.84 mmol) of 2-bromomalonaldehyde are added to a
solution of 15.00 g (55.70 mmol) of
1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridine-3-carboximidamide
(example I, step 5) in 200 ml of glacial acetic acid and stirring
at 100.degree. C. for 2 hours. The solvent is removed in vacuo. The
residue is purified by chromatography on silica gel (eluent:
DCM/methanol 40:1 to 30:1). 9.51 g (44% of theory) of the product
are obtained.
[0128] HPLC: R.sub.t=4.85 min.
[0129] LC/MS (method C): R.sub.t=4.57 min.
[0130] MS (ESIpos): m/z=385 (M+H)+
[0131] .sup.1H-NMR (300 MHz, DMSO-d.sub.6): .delta.=5.87 (s, 2H),
7.17 (q, 1H), 7.21-7.30 (m, 2H), 7.37 (q, 1H), 7.45 (dd, 1H), 8.70
(d, 1H), 8.82 (d, 1H), 9.13 (s, 2H).
EXAMPLE II
Step 1
7-Benzyl-3-phenylsulfonyl-9-oxa-3,7-diazabicyclo[3.3.1]nonane
[0132] ##STR21##
[0133] 104.00 g (0.2 mol) of
N-phenylsulfonyl-2,6-bisiodomethylmorpholine [Stetter, H.;
Meissner, H.-J. Chem. Ber. 96, 2827 (1963)] are heated with 64.00 g
(0.6 mol) of benzylamine in 1 l of xylene under reflux overnight.
The benzylammonium iodide is filtered off with suction, the
filtrate is concentrated, and the residue is recrystallized from
ethanol. 32 g (44.6% of theory) of the product are obtained.
[0134] M.p.: 185-186.degree. C.
Step 2
7-Benzyl-9-oxa-3,7-diazabicyclo[3.3.1]nonane
[0135] ##STR22##
[0136] 10.00 g (0.25 mol) of lithium aluminum hydride are
introduced into 300 ml of absolute tetrahydrofuran and heated to
reflux, and 18.00 g (50 mmol) of
7-benzyl-3-phenylsulfonyl-9-oxa-3,7-diazabicyclo[3.3.1]nonane,
dissolved in 150 ml of absolute tetrahydrofuran, are added
dropwise. The mixture is boiled under reflux for 48 hours, 10 ml
portions of water, 15% strength potassium hydroxide solution and
again water are added dropwise, and the organic salts are filtered
off with suction and extracted by boiling twice with
tetrahydrofuran. The tetrahydrofuran solutions are concentrated,
and the residue is distilled under high vacuum. 5.30 g (43.5% of
theory) of the product are obtained
[0137] Boiling point: 110.degree. C./0.1 mbar
Step 3
tert-Butyl
7-benzyl-9-oxa-3,7-diazabicyclo[3.3.1]nonane-3-carboxylate
[0138] ##STR23##
[0139] 1.00 g of sodium hydroxide in 5 ml of water is added to 5.00
g (23 mmol) of 7-benzyl-9-oxa-3,7-diazabicyclo[3.3.1]nonane in 25
ml of tert-butanol, and 5.30 g (24 mmol) of di-tert-butyl
pyrocarbonate are added dropwise. The mixture is stirred at room
temperature overnight, 50 ml of water are added, three chloroform
extractions and drying over magnesium sulfate are carried out, the
desiccant is filtered off with suction, the filtrate is
concentrated, and the crystalline residue is stirred with n-hexane.
The crystals are filtered off with suction and dried in air. 5.80 g
of the product (73% of theory) are obtained.
[0140] M.p.: 100-102.degree. C.
Step 4
tert-Butyl 9-oxa-3,7-diazabicyclo[3.3.1]nonane-3-carboxylate
[0141] ##STR24##
[0142] 5.60 g (17.6 mmol) of tert-butyl
7-benzyl-9-oxa-3,7-diazabicyclo[3.3.1]nonane-3-carboxylate are
dissolved in 100 ml of ethanol, 1.00 g of 10% palladium on
activated carbon is added, and hydrogenation is carried out at
100.degree. C. and 100 bar. The catalyst is filtered off with
suction, and the filtrate is concentrated, whereupon 3.80 g (94.5%
of theory) of pure product crystallize out.
[0143] M.p.: 93-95.degree. C.
EXAMPLE III
Step 1
1-Benzyl-3-hydroxy-3-(2-hydroxyethylaminomethyl)pyrrolidine
[0144] ##STR25##
[0145] 32.7 g (0.17 mol) of 5-benzyl-1-oxa-5-azaspiro[4.2]heptane
(U.S. Pat. No. 4,508,724) are added dropwise to 31.0 g (0.52 mol)
of ethanolamine in 250 ml of water, and the mixture is stirred at
room temperature overnight. It is extracted with diethyl ether, the
aqueous phase is concentrated, and the residue is distilled under
high vacuum. 42.1 g (95.9% of theory) of the product are
obtained.
[0146] Boiling point: 180-190.degree. C./0.1 mbar
Step 2
7-Benzyl-1-oxa-4,7-diazaspiro[5.4]decane
[0147] ##STR26##
[0148] 85.0 g (340 mmol) of
1-benzyl-3-hydroxy-3-(2-hydroxyethylaminomethyl)pyrrolidine are
dissolved in a mixture of 280 ml of concentrated sulfuric acid and
140 ml of water and heated at 180.degree. C. overnight. The mixture
is made alkaline with 45% strength sodium hydroxide solution,
precipitated salts are dissolved in water, and the solution is
extracted five times with 200 ml of chloroform each time. The
organic phases are dried over potassium carbonate, the desiccant is
removed, and the solution is concentrated. The residue is distilled
under high vacuum. 60.0 g (76% of theory) of the product are
obtained.
[0149] Boiling point: 125.degree. C./0.08 mbar
Step 3
tert-Butyl
7-benzyl-1-oxa-4,7-diazaspiro[5.4]decane-4-carboxylate
[0150] ##STR27##
[0151] 2.0 g of sodium hydroxide in 25 ml of water are added to
10.3 g (47 mmol) of 7-benzyl-1-oxa-4,7-diazaspiro[5.4]decane in 30
ml of tert-butanol, and 11.0 g (50 mmol) of di-tert-butyl
pyrocarbonate are added dropwise. The mixture is stirred at room
temperature overnight, 50 ml of water are added, three chloroform
extractions and drying over potassium carbonate are carried out,
the desiccant is filtered off with suction, the filtrate is
concentrated, and the residue is distilled under high vacuum. 13.8
g of the product (88% of theory) are obtained.
[0152] Boiling point: 160.degree. C./0.3 mbar
Step 4
tert-Butyl 1-oxa-4,7-diazaspiro[5.4]decane-4-carboxylate
[0153] ##STR28##
[0154] 13.7 g (41 mmol) of tert-butyl
7-benzyl-1-oxa-4,7-diazaspiro[5.4]decane-4-carboxylate are
dissolved in 300 ml of methanol, 3.0 g of 10% palladium on
activated carbon are added, and hydrogenation is carried out at
100.degree. C. and 100 bar. The catalyst is filtered off with
suction, the filtrate is concentrated, and residue is distilled
under high vacuum. 7.6 g (75% of theory) of the product are
obtained. Boiling point: 113.degree. C./0.07 mbar
EXAMPLE IV
Step 1
10-Oxa-4-azatricyclo[5.2.1.0.sup.2,6]decane-3,5-dione
[0155] ##STR29##
[0156] This compound can be obtained by Diels-Alder reaction of
furan with maleimide, for example in analogy to Fisera, L.,
Melnikov, J., Pronayova, N., Ertl, P., Chem. Pap. 1995, 49 (4),
186-191.
Step 2
10-Oxa-4-azatricyclo[5.2.1.0.sup.2,6]decane
[0157] ##STR30##
[0158] 5.00 g (29.91 mmol) of
10-oxa-4-azatricyclo[5.2.1.0.sup.2,6]decane-3,5-dione (example IV,
step 1) were suspended in 150 ml of absolute THF under argon and
cooled in an ice bath. 2.27 g (59.82 mmol) of lithium aluminum
hydride are added in portions, and the mixture is stirred at
0.degree. C. overnight. The reaction solution is hydrolyzed with
saturated sodium chloride solution and distilled water, the
resulting suspension is filtered, and the solid is washed with
ethyl acetate. The organic phase of the filtrate is separated off,
and the aqueous phase is extracted once more with ethyl acetate.
The combined organic phases are dried and filtered, and the solvent
is removed in vacuo. The residue is suspended in diethyl ether,
filtered, washed with diethyl ether and dried. 730 mg (13% of
theory) of the product are obtained.
[0159] GC/MS: R.sub.t=6.22 min.
[0160] MS (EI): m/z=139 (M).sup.+
[0161] .sup.1H-NMR (200 MHz, DMSO-d.sub.6): .delta.=1.30-1.60 (m,
4H), 2.06-2.22 (quintet, 2H), 2.26-2.40 (dd, 2H), 2.81-2.98 (dd,
2H), 4.11-4.22 (t, 2H).
EXAMPLE V
Decahydropyrrolo[3,4-b]pyrrolizidine
[0162] ##STR31##
[0163] The preparation of this compound is described in: Schenke,
Th., Petersen, U., U.S. Pat. No. 5,071,999.
EXAMPLE VI
Step 1
2-Benzyl-2,5-diazabicyclo[2.2.1]heptane
[0164] ##STR32##
[0165] The preparation of this compound is described in:
Portoghese, P. S., Mikhail, A. A., J. Org. Chem. 31 (1966),
1059.
Step 2
tert-Butyl
5-benzyl-2,5-diazabicyclo[2.2.1]heptane-2-carboxylate
[0166] ##STR33##
[0167] This compound is prepared in analogy to the method of
example III, step 3.
Step 3
tert-Butyl 2,5-diazabicyclo[2.2.1]heptane-2-carboxylate
[0168] ##STR34##
[0169] This compound is prepared in analogy to the method of
example III, step 4.
Step 4
tert-Butyl 5
{2-[1-(2-fluoroenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl]-5-pyrimidinyl}-2,5--
diazabicyclo[2.2.1]heptane-2-carboxylate
[0170] ##STR35##
[0171] 95 mg (0.85 mmol) of thoroughly dried potassium
tert-butoxide are introduced into a previously heat-dried and
evacuated apparatus under argon. 18 mg (0.02 mmol) of
tris(dibenzylideneacetone)dipalladium, 48 mg (0.08 mmol) of
rac-BINAP and 300 mg (0.77 mmol) of
3-(5-bromo-2-pyrimidinyl)-1-(2-fluorobenzyl)-1H-pyrazolo-[3,4-b]pyridine
(example I, step 6) are successively added, and the apparatus is
again evacuated and flushed with argon. The reagents are suspended
in 40 ml of absolute toluene and then 460 mg (2.32 mmol) of
tert-butyl-2,5-diazabicyclo[2.2.1]heptane-2-carboxylate (example
VI, step 3) are added to the reaction mixture. The latter is
stirred at 60.degree. C. overnight. The solvent is removed in
vacuo, and the residue is purified by preparative HPLC. 327 mg (84%
of theory) of the product are obtained.
[0172] LC/MS (method C): R.sub.t=4.50 min.
[0173] MS (ESIpos): m/z=502.1 (M+H).sup.+
[0174] R.sub.f=0.38 (DCM/methanol 20:1)
[0175] .sup.1H-NMR (300 MHz, DMSO-d.sub.6): .delta.=1.37 (d, 9H),
1.96 (s, 2H), 3.21 (t, 2H), 3.30-3.45 (m, 1H), 3.64 (br d, 1H),
4.51 (br d, 1H), 4.78 (s, 1H), 5.81 (s, 2H), 7.08-7.53 (m, 5H),
8.38 (s, 2H), 8.63 (d, 1H), 8.82 (d, 1H).
[0176] The examples listed in the following table can be prepared
from the appropriate starting compounds in analogy to the method of
example VI described above: TABLE-US-00004 Ex. No. Structure
Analytical data VII ##STR36## LC/MS (method A): R.sub.t = 2.95 min.
MS (ESIpos): m/z = 532 (M + H).sup.+R.sub.f = 0.41 (DCM/methanol
20:1) .sup.1H-NMR (300 MHz, DMSO-d.sub.6): .delta. = 3.22 (br d,
3H), 3.41 (s, 10H), 3.85-4.05 (m, 5H), 4.14 (d, 1H), 5.87 (s, 2H),
7.10-7.27 (m, 3H), 7.31-7.43 (m, 2H), 8.53 (s, 2H), 8.62 (d, 1H),
8.80 (d, 1H). VIII ##STR37## LC/MS (method A): R.sub.t = 3.29 min.
MS (ESIpos): m/z = 546 (M + H).sup.+.sup.1H-NMR (200 MHz,
DMSO-d.sub.6): .delta. = 1.40 (s, 9H), 1.92-2.24 (m 2H), 3.32-3.53
(m, 5H), 3.68 (br s, 2H), 4.21 (br s, 3H), 5.81 (s, 2H), 7.10-7.45
(m, 5H), 8.27 (s, 2H), 8.62 (d, 1H), 8.83 (d, 1H). IX ##STR38##
.sup.1H-NMR (400 MHz, DMSO-d.sub.6): .delta. = 2.01 (br s, 1H),
2.05-2.18 (m, 1H), 3.29 (d, 1H), 3.45-3.62 (m, 3H), 4.51 (s, 1H),
5.85 (s, 2H), 7.15-7.31 (m, 3H), 7.34-7.57 (m, 2H), 8.30 (s, 2H),
8.68 (d, 1H), 8.88 (d, 1H). X ##STR39## LC/MS (method D): R.sub.t =
4.79 min. MS (ESIpos): m/z = 504.4 (M + H).sup.+.sup.1H-NMR (200
MHz, DMSO-d.sub.6): .delta. =1.43 (s, 9H), 2.04-2.22 (m, 2H),
3.28-3.44 (m, 1H), 3.46-3.73 (m, 3H), 4.82 (br t, 1H), 5.81 (s,
2H), 7.10-7.43 (m, 5H), 8.29 (s, 2H), 8.63 (d, 1H), 8.81 (d, 1H).
XI ##STR40## LC/MS (method A): R.sub.t = 2.46 min. MS (ESIpos): m/z
= 391 (M + H).sup.+.sup.1H-NMR (200 MHz, DMSO-d.sub.6): .delta.
=1.85-2.19 (m, 2H), 3.24 (d, 1H), 3.40-3.59 (m, 3H), 4.46 (s, 2H),
5.81 (s, 2H), 7.09-7.45 (m, 5H), 8.26 (s, 2H), 8.62 (d, 1H), 8.83
(d, 1H).
EXAMPLE XII
Step 1
2,5-Anhydro-3,4-dideoxy-1,6-bis-O-[(4-methylphenyl)sulfonyl]hexitol
[0177] ##STR41##
[0178] 34.0 g (261 mmol) of 2,5-bis(hydroxymethyl)tetrahydrofuran
are dissolved in 260 ml of dichloromethane. A solution of 99.0 g
(521 mmol) of p-toluenesulfonyl chloride in 52 ml of pyridine and
130 ml of dichloromethane is added dropwise thereto. After stirring
at room temperature for 24 hours, the precipitate is filtered off
with suction and washed with dichloromethane. The filtrate and the
washing phases are combined, washed with dilute hydrochloric acid
and then with saturated aqueous sodium bicarbonate solution, dried
over magnesium sulfate and evaporated to dryness. The crude product
is recrystallized from ethanol.
[0179] Yield: 112 g (98% of theory)
[0180] M.p.: 125.degree. C.
[0181] MS (CIpos): m/z=441 (M+H).sup.+.
Step 2
3-Benzyl-8-oxa-3-azabicyclo[3.2.1]octane
[0182] ##STR42##
[0183] 112 g (250 mmol) of
2,5-anhydro-3,4-dideoxy-1,6-bis-O-[(4-methylphenyl)sulfonyl]-hexitol
from step 1 and 90.7 g (840 mmol) of benzylamine in 500 ml of
toluene are heated under reflux for 20 hours. The precipitate is
then filtered off with suction and washed with toluene. The
combined toluene phases are concentrated in a rotary evaporator and
distilled in vacuo. After a benzylamine fore-run, the product is
obtained.
[0184] Yield: 28.2 g (54% of theory)
[0185] Boiling point: 96-99.degree. C./8 mbar
[0186] MS (CIpos): m/z=204 (M+H).sup.+.
Step 3
8-Oxa-3-azabicyclo[3.2.1]octane hydrochloride
[0187] ##STR43##
[0188] 28.20 g (136 mmol) of
3-benzyl-8-oxa-3-azabicyclo[3.2.1]octane from step 2 are dissolved
in 200 ml of ethanol, a 5.00 g of palladium on activated carbon
(10%) are added, and hydrogenation is carried out with 100 bar of
hydrogen in an autoclave at 100.degree. C. The catalyst is filtered
off with suction and the mother liquor is mixed with 11.9 ml of
concentrated hydrochloric acid and concentrated in a rotary
evaporator. Acetone is added to the residue, and the resulting
precipitate is filtered off with suction and dried over phosphorus
pentoxide.
[0189] Yield: 17.0 g (84% of theory)
[0190] M.p.: 209-221.degree. C.
[0191] MS (CIpos): m/z=114 (M+H).sup.+.
Step 4
8-Oxa-3-azabicyclo[3.2.1]octane
[0192] ##STR44##
[0193] 4.15 g (27.7 mmol) of 8-oxa-3-azabicyclo[3.2.1]octane
hydrochloride from step 3 are suspended in 100 ml of
dichloromethane, and a solution of 3.23 g (30.5 mmol) of sodium
carbonate in 30 ml of water is added. The mixture is stirred at
room temperature for 30 minutes. The organic phase is then
separated off, washed with 30 ml of saturated aqueous sodium
chloride solution and evaporated to dryness in a rotary evaporator.
The residue is dried in vacuo.
[0194] Yield: 2.46 g (76% of theory).
Step 5
Diethyl 2-(8-oxa-3-azabicyclo[3.2.1]oct-3-yl)malonate
[0195] ##STR45##
[0196] 4.72 g (19.8 mmol) of diethyl 2-bromomalonate are introduced
into 30 ml of acetonitrile. Then 3.82 g (27.7 mmol) of potassium
carbonate and 2.46 g (21.7 mmol) of 8-oxa-3-azabicyclo[3.2.1]octane
from step 4 are added. The suspension is stirred at 50.degree. C.
overnight. This is followed by filtration with suction and
evaporation of the filtrate to dryness in a rotary evaporator. The
residue is employed without further purification in the next
stage.
[0197] Yield: 5.09 g (95% of theory).
Step 6
2-[1-(2-Fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl]-5-(8-oxa-3-azabicycl-
o-[3.2.1]oct-3-yl)-4,6-pyrimidinediol
[0198] ##STR46##
[0199] 0.50 g (1.11 mmol) of
1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridine-3-carboximidamide
(example I, step 5) are suspended in 40 ml of toluene. Then 1.40 g
(5.16 mmol) of diethyl
2-(8-oxa-3-azabicyclo[3.2.1]oct-3-yl)malonate from step 5 are
added. The mixture is stirred at 140.degree. C. overnight. The
solid is then filtered off with suction, washed with diethyl ether
dried in vacuo.
[0200] Yield: 515 mg (24% of theory)
[0201] MS (ESIpos): m/z=449 (M+H).sup.+.
Step 7
3-[4,6-Dichloro-5-(8-oxa-3-azabicyclo[3.2.1]oct-3-yl)-2-pyrimidinyl]-1-(2--
fluorobenzyl)-1H-pyrazolo[3,4-b]pyridine
[0202] ##STR47##
[0203] 1.33 g (4.69 mmol) of
2-[1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl]-5-(8-oxa-3-azabicyc-
lo[3.2.1]oct-3-yl)-4,6-pyrimidinediol from step 6 are dissolved in
5 ml (53.6 mmol) of phosphorus oxychloride. 3 drops of
N,N-dimethylformamide are added to the mixture, and it is heated
under reflux for 3 hours. After cooling to room temperature and
concentration in a rotary evaporator, the residue is dried under
high vacuum. The crude product is purified by preparative HPLC.
[0204] Yield: 252 mg (46% of theory)
[0205] LC/MS (method E): R.sub.t=3.58 min
[0206] MS (ESIpos): m/z=485 (M+H).sup.+
[0207] .sup.1H-NMR (300 MHz, DMSO-d.sub.6): .delta.=1.80-1.92 (m,
2H), 2.11-2.20 (m, 2H), 2.66 (d, 2H), 3.54 (dd, 2H), 4.35 (s, 2H),
5.88 (s, 2H), 7.10-7.28 (m, 3H), 7.31-7.41 (m, 1H), 7.55 (dd, 1H),
8.70-8.80 (m, 2H).
EXAMPLE XIII
1-Methyloctahydropyrrolo[3,4-d][1,3]oxazine
[0208] ##STR48##
[0209] The preparation of this compound is described in: Petersen,
U. et al., EP 350 733.
EXAMPLE XIV
tert-Butyl(3R)-3-hydroxy-1-piperidincarboxylate
[0210] ##STR49##
[0211] 26.80 g (0.20 mol) of (3R)-3-piperidinol hydrochloride are
introduced into 150 ml of THF and, while cooling in an ice bath,
65.04 g (0.64 mol) of triethylamine are added. The mixture is
stirred at the same temperature for 20 minutes and then 70 ml of
di(tert-butyl) dicarbonate are introduced into the solution, and
the mixture is stirred at RT overnight. The reaction solution is
extracted with 1N hydrochloric acid. The organic phase is washed
with saturated aqueous sodium chloride solution, dried and
filtered, and the solvent is removed in vacuo. 36.00 g (90% of
theory) of the product are obtained.
[0212] GC/MS: R.sub.t=12.43 min.
[0213] MS (EI): m/z=201 (M).sup.+
[0214] .sup.1H-NMR (400 MHz, DMSO-d.sub.6): .delta.=1.21-1.32 (m,
2H), 1.34-1.42 (m, 9H), 1.48 (s, 1H), 1.58-1.65 (m, 1H), 1.77-1.88
(m, 1H), 2.78 (br t, 1H), 3.33-3.41 (m, 1H), 3.58-3.63 (dt, 1H),
3.75 (br d, 1H), 4.82 (s, 1H).
EXAMPLE XV
tert-Butyl(3R)-3-hydroxy-1-pyrrolidinecarboxylate
[0215] ##STR50##
[0216] This compound is obtained from 3-(R)-hydroxypyrrolidine in
analogy to the method of example XIV.
EXAMPLE XVI
Step 1
tert-Butyl(3S,4S)-3,4-dihydroxy-1-pyrrolidinecarboxylate
[0217] ##STR51##
[0218] This compound is prepared as described in: Nagel, U., Angew.
Chem. 96 (1984), 425.
Step 2
tert-Butyl(3S,4S)-3,4-dimethoxy-1-pyrrolidinecarboxylate
[0219] ##STR52##
[0220] 2.60 g (12.73 mmol) of
tert-butyl(3S,4S)-3,4-dihydroxy-1-pyrrolidinecarboxylate (example
XVI, step 1) are dissolved in 60 ml of absolute DMF under argon
and, while cooling in an ice bath, 0.74 g (29.42 mmol; 95% pure) of
sodium hydride is added in portions. The mixture is stirred at
0.degree. C. for 10 minutes and then, at the same temperature, 4.00
g (28.14 mmol) of iodomethane are added dropwise. The reaction
mixture is stirred at Rt for 2 hours and then hydrolyzed by adding
20 ml of saturated aqueous sodium chloride solution and 80 ml of
distilled water. The aqueous phase is extracted with ethyl acetate.
The combined organic phases are washed with saturated aqueous
sodium chloride solution, dried and filtered, and the solvent is
removed under vacuum. The residue is purified by chromatography on
silica gel (eluent: DCM/methanol 100:1). 2.39 (76% of theory) of
the product are obtained.
[0221] LC/MS (method D): R.sub.t=3.45 min.
[0222] MS (ESIpos): m/z=255 (M+H).sup.+
[0223] .sup.1H-NMR (300 MHz, DMSO-d.sub.6): .delta.=1.39 (s, 10H),
2.73 (s, 1H), 2.89 (s, 1H), 3.28 (s, 7H), 3.80 (br s, 2H).
Step 3
(3S,4S)-3,4-Dimethoxypyrrolidine
[0224] ##STR53##
[0225] 2.30 g (9.35 mmol; 94% pure) of
tert-butyl(3S,4S)-3,4-dimethoxy-1-pyrrolidinecarboxylate (example
XVI, step 2) are taken up in 50 ml of hydrochloric acid (4M in
dioxane) and stirred at RT overnight. The solvent is removed in
vacuo, and the residue is suspended in DCM, mixed with 1N sodium
hydroxide solution and stirred at RT for 10 minutes. The phases are
separated and the aqueous phase is extracted several times with
DCM. The combined organic phases are extracted with saturated
aqueous sodium chloride solution, dried and filtered, and the
solvent is removed in vacuo. 872 mg (63% of theory) of the product
are obtained.
[0226] GC/MS: R.sub.t=4.76 min.
[0227] MS (CIpos): m/z=132 (M+H).sup.+
[0228] .sup.1H-NMR (400 MHz, DMSO-d.sub.6): .delta.=2.63 (dd, 4H),
2.89 (dd, 4H), 3.63 (q, 4H), 7.95 (s, 1H).
[0229] The examples listed in the following table can be prepared
from the appropriate starting compounds in analogy to the method of
example XVI described above: TABLE-US-00005 Ex. No. Structure
Analytical data XVII ##STR54## GC/MS: R.sub.t = 3.14 min. MS
(CIpos): m/z = 133.1 (M + H).sup.+.sup.1H-NMR (300 MHz,
DMSO-d.sub.6): .delta. =1.08-1.15 (m, 3H), 1.58-1.85 (m, 2H),
2.40-2.60 (m, 1H), 2.71-2.91 (m, 4H), 3.31-3.43 (m, 2H), 3.92-4.00
(m, 1H). XVIII ##STR55## GC/MS: R.sub.t = 6.77 min. MS (EIpos): m/z
= 116 (M + H).sup.+.
EXAMPLE XIX
Step 1
(3R)-3-[(Triethylsilyl)oxy]pyrrolidine
[0230] ##STR56##
[0231] 381 mg (2.53 mmol) of triethylchlorosilane are added to a
solution, cooled in ice, of 200 mg (2.30 mmol) of
(3R)-3-pyrrolidinol in 3 ml of absolute pyridine under argon. The
reaction mixture is stirred at RT for one hour and is then mixed
with 6 ml of distilled water and extracted with diethyl ether. The
solvent of the organic phase is removed under vacuum, and the
residue is thoroughly dried. 99 mg (21% of theory) of the product
are obtained.
[0232] MS (DCI): m/z=219.2 (M+H).sup.+
[0233] R.sub.f=0.39 (DCM/methanol 20:1)
[0234] .sup.1H-NMR (200 MHz, DMSO-d.sub.6): .delta.=0.58 (q, 6H),
0.92 (t, 9H), 1.81-2.02 (m, 1H), 2.85 (br d, 1H), 3.03-3.18 (m,
4H), 4.48 (br quintet, 1H), 8.52 (br s, 1H).
Step 2
1-(2-Fluorobenzyl)-3-(5-{(3R)-3-[(triethylsilyl)oxy]-1-pyrrolidinyl}-2-pyr-
imidinyl)-1H-pyrazol[3,4-b]pyridine
[0235] ##STR57##
[0236] The compound is prepared in analogy to the method of example
VI, step 4, apart from the following modifications. The reaction is
carried out in absolute dioxane with sodium tert-butoxide instead
of the corresponding potassium compound. Starting from 94 mg (0.25
mmol) of
3-(5-bromo-2-pyrimidinyl)-1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridine
(example I, step 6) and 99 mg (0.49 mmol) of
(3R)-3-[(triethylsilyl)oxy]pyrrolidine (example XIX, step 1), 80 mg
(65% of theory) of the product are obtained.
[0237] HPLC: R.sub.t=3.98 min.
[0238] MS (ESIpos): m/z=505 (M+H).sup.+
[0239] R.sub.f=0.32 (DCM/ethyl acetate 2:1)
[0240] .sup.1H-NMR (300 MHz, DMSO-d.sub.6): .delta.=0.61 (q, 6H),
0.94 (t, 9H), 1.24 (s, 1H), 1.89-2.02 (m, 1H), 2.08-2.22 (m, 1H),
3.47 (t, 2H), 3.59 (dd, 1H), 4.63 (s, 1H), 5.80 (s, 2H), 7.10-7.28
(m, 3H), 7.30-7.41 (m, 2H), 8.27 (s, 2H), 8.62 (d, 1H), 8.82 (d,
1H).
Step 3
(3R)-1-{2-[1-(2-Fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl]-5-pyrimidiny-
l}-3-pyrrolidinol
[0241] ##STR58##
[0242] 2.64 g (5.23 mol) of
1-(2-fluorobenzyl)-3-(5-{(3R)-3-[(triethylsilyl)oxy]-1-pyrrolidinyl}-2-py-
rimidinyl)-1H-pyrazol[3,4-b]pyridine (example XIX, step 2) are
dissolved in 50 ml of absolute THF under argon, and 2.19 g (8.37
mol) of a 1 molar tetrabutylammonium fluoride solution in THF are
added. The solution is stirred at RT overnight. It is diluted with
50 ml of a 1:1 mixture of distilled water and ethyl acetate, and
the aqueous phase is separated off and then extracted three times
with ethyl acetate. The solvent of the combined organic phases is
removed in vacuo, and the resulting crude product is
chromatographed on silica gel (eluent: DCM/methanol 30:1). 1.64 g
(80% of theory) of the product are obtained.
[0243] HPLC: R.sub.t=4.02 min.
[0244] MS (ESIpos): m/z=391 (M+H).sup.+
[0245] R.sub.f=0.42 (DCM/methanol 20:1)
[0246] .sup.1H-NMR (300 MHz, DMSO-d.sub.6): .delta.=1.40 (s, 1H),
1.89-2.17 (m, 2H), 3.42-3.58 (m, 3H), 4.46 (s, 1H), 5.04 (d, 1H),
5.80 (s, 2H), 7.10-7.28 (m, 3H), 7.30-7.42 (m, 2H), 8.25 (s, 2H),
8.62 (d, 1H), 8.83 (d, 1H).
[0247] The following examples XX and XXI can be obtained by
reacting the appropriate halopyridines (4-chloro- or
3-bromopyridines) by either reacting them in analogy to the method
in Saji, H.; Watanabe, A.; Magata, Y.; Ohmomo Y.; Kiyono, Y.;
Yamada, Y.; Iida, Y.; Yonekura, Y.; Konishi, J.; Yokoyama, A. Chem.
Pharm. Bull. 1997, 45, 284-290 with hexabutyldistannane with the
addition of Pd(PPh.sub.3).sub.4 in toluene, or lithiating them in
analogy to the method of Garg, S.; Garg, P. K;, Zalutsky, M. R.;
Bioconjugate Chem. 1991, 2, 50-56 with buthyllithium and
subsequently introducing the stannyl radical with
chlorotributylstannane:
EXAMPLE XX
2-Fluoro-4-(tributylstannyl)pyridine
[0248] ##STR59##
EXAMPLE XXI
2-Fluoro-3-(tributylstannyl)pyridine
[0249] ##STR60##
EXAMPLE XXII
5-Cyclopropyl-4-(tributylstannyl)isoxazole
[0250] ##STR61##
[0251] This compound can be prepared in analogous manner to the
compounds of examples XX and XXI.
EXAMPLE XXIII
Ethyl 2-bromo-4-fluorobenzoate
[0252] ##STR62##
[0253] 281 mg (2.21 mmol) of oxalyl chloride are added to a
solution of 220 mg (1.01 mmol) of 2-bromo-4-fluorobenzoic acid in 5
ml of absolute toluene under argon, and the mixture is stirred at
RT for 4 hours. The solvent is removed in vacuo, and the residue is
taken up three times in DCM and the solvent is removed each time in
vacuo. A yellow oil is obtained and is dissolved in a little DCM.
213 mg (2.10 mmol) of triethylamine and 2 ml of ethanol are added
to the solution, and the mixture is stirred at RT for three hours.
The reaction mixture is diluted with twice the volume of distilled
water and extracted with DCM. The solvent of the organic phase is
removed in vacuo, and the residue is chromatographed on silica gel
(eluent: DCM/methanol 20:1). 110 mg (39% of theory) of the product
are obtained.
[0254] HPLC: R.sub.t=4.80 min.
[0255] MS (ESIpos): m/z=248 (M+H).sup.+
[0256] .sup.1H-NMR (200 MHz, DMSO-d.sub.6): .delta.=1.32 (t, 3H),
4.32 (q, 2H), 7.40 (t, 1H), 7.73 (dd, 1H), 7.81 (dd, 1H).
EXAMPLE XXIV
1-(2-Fluorobenzyl)-3-[5-(trimethylstannyl)-2-pyrimidinyl]-1H-pyrazolo[3,4--
b]-pyridine
[0257] ##STR63##
[0258] 5.12 g (15.62 mmol) of 1,1,1,2,2,2-hexamethyldistannane and
0.59 g (0.83 mmol) of bis(triphenylphosphine)palladium(II) chloride
are added to a solution of 2.00 g (5.21 mmol) of
3-(5-bromo-2-pyrimidinyl)-1-(2-fluorobenzyl)-1H-pyrazol[3,4-b]-pyridine
(example I, step 6) in 75 ml of absolute dioxane under argon, and
the mixture is stirred at 80-85.degree. C. overnight. It is
hydrolyzed by adding 40 ml of a 1 molar aqueous potassium fluoride
solution and extracted three times with ethyl acetate. The combined
organic phases are dried over magnesium sulfate and filtered, and
the solvent is removed under vacuum. The crude product is purified
on silica gel (eluent:cyclohexane/ethyl acetate 3:1). 1.56 g (60%
of theory) of the product are obtained.
[0259] LC/MS (method D): R.sub.t=5.20 min.
[0260] MS (ESIpos): m/z=469 (M+H).sup.+
[0261] R.sub.f=0.75 (toluene/ethyl acetate 1:1)
[0262] .sup.1H-NMR (200 MHz, DMSO-d.sub.6): .delta.=0.39 (t, 9H),
5.87 (s, 2H), 7.10-7.49 (m, 5H), 8.68 (d, 1H), 8.87 (d, 1H), 8.90
(s, 3H).
EXAMPLE XXV
Ethyl 2-bromo-5-fluorobenzoate
[0263] ##STR64##
[0264] The compound is prepared in analogy to the method of example
XXIII. 320 mg (34% of theory) of the product are obtained starting
from 670 mg (3.06 mmol) of 2-bromo-5-fluorobenzoic acid.
[0265] HPLC: R.sub.t=4.66 min.
[0266] MS (ESIpos): m/z=248 (M+H).sup.+
[0267] R.sub.f=0.90 (DCM/methanol 20:1)
[0268] .sup.1H-NMR (300 MHz, DMSO-d.sub.6): .delta.=1.33 (t, 3H),
4.33 (q, 2H), 7.37 (t, 1H), 7.61 (dd, 1H), 7.81 (dd, 1H).
EXAMPLE XXVI
Step 1
1-Cyclopropyl-2-{2-[1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl]-5-p-
yrimidinyl}ethanone
[0269] ##STR65##
[0270] 500 mg (5.2 mmol) of thoroughly dried sodium tert-butoxide
are introduced into a heat-dried and evacuated apparatus under
argon. 143 mg (0.16 mmol) of tris(dibenzylideneacetone)dipalladium,
243 mg (0.39 mmol) of rac-BINAP and 1000 mg (2.6 mmol) of
3-(5-bromo-2-pyrimidinyl)-1-(2-fluorobenzyl)-1H-pyrazol[3,4-b]pyridine
(example I, step 6) are successively added, and the apparatus is
again evacuated and flushed with argon. The reagents are suspended
in 40 ml of absolute dioxane, mixed with 438 mg (0.47 ml, 5.2 mmol)
of cyclopropyl methyl ketone and heated to reflux for 2 hours. The
solvent is removed in vacuo, and the residue is purified by
chromatography on silica gel (eluent:DCM/methanol 20:1). 630 mg
(57% of theory) of the product are obtained.
[0271] HPLC: R.sub.t=4.53 min.
[0272] MS (ESIpos): m/z=388 (M+H).sup.+
[0273] R.sub.f=0.51 (DCM/methanol 20:1)
[0274] .sup.1H-NMR (300 MHz, DMSO-d.sub.6): .delta.=0.92-1.02 (m,
4H), 2.20 (quintet, 1H), 4.12 (s, 2H), 5.87 (s, 2H), 7.16 (q, 1H),
7.22-7.49 (m, 3H), 7.42 (dd, 1H), 8.67 (d, 1H), 8.77 (s, 2H), 8.88
(d, 1H).
Step 2
(2E)-1-Cyclopropyl-3-(dimethylamino)-2-{2-[1-(2-fluorobenzyl)-1H-pyrazol[3-
,4-b]-pyridin-3-yl]-5-pyrimidinyl}-2-propen-1-one
[0275] ##STR66##
[0276] 100 mg (0.26 mmol) of
1-cyclopropyl-2-{2-[1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]-pyridin-3-yl]-5-
-pyrimidinyl}ethanone (example XXVI, step 1) are added to a
solution of 123 mg (1.03 mmol) of
N-(dimethoxymethyl)-N,N-dimethylamine in 1 ml of DMF. The reaction
mixture is stirred at 110.degree. C. for 2 hours and then poured
into distilled water. The precipitated solid is filtered off,
washed with distilled water and dried. 93 mg (64% of theory) of the
product are obtained and are directly reacted further without
further purification.
[0277] HPLC: R.sub.t=4.67 min.
[0278] MS (ESIpos): m/z=443 (M+H).sup.+
[0279] .sup.1H-NMR (200 MHz, DMSO-d.sub.6): .delta.=0.67-0.75 (m,
2H), 0.78-0.84 (m, 2H), 2.13-2.31 (m, 1H), 2.83 (s, 6H), 5.86 (s,
2H), 7.10-7.46 (m, 5H), 7.94 (s, 1H), 8.66 (s, 3H), 8.90 (d,
1H).
Exemplary Embodiments
EXAMPLE 1
1-(2-Fluorobenzyl)-3-{5-[(1S,5R)-1,3,3-trimethyl-6-azabicyclo[3.2.1]oct-6--
yl]-2-pyrimidinyl}-1H-pyrazol[3,4-b]pyridine
[0280] ##STR67##
[0281] 95 mg (0.85 mmol) of thoroughly dried potassium
tert-butoxide are introduced into a heat-dried and evacuated
apparatus under argon. 18 mg (0.02 mmol) of
tris(dibenzylideneacetone)dipalladium, 48 mg (0.08 mmol) of
rac-BINAP and 300 mg (0.77 mmol) of
3-(5-bromo-2-pyrimidinyl)-1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridine
(example I, step 6) are successively added, and the apparatus is
again evaporated and flushed with argon. The reagents are suspended
in 4.5 ml of absolute toluene and then 355 mg (2.32 mmol) of
(1S,5R)-1,3,3-trimethyl-6-azabicyclo[3.2.1]octane are added to the
reaction mixture. The latter is stirred at 60.degree. C. overnight.
The solvent is removed in vacuo, and the residue is purified by
preparative HPLC. 73 mg (20% of theory) of the product are
obtained.
[0282] LC/MS (method A): R.sub.t=3.79 min.
[0283] MS (ESIpos): m/z=457 (M+H).sup.+
[0284] R.sub.f=0.75 (DCM/methanol 20:1)
[0285] .sup.1H-NMR (300 MHz, DMSO-d.sub.6): .delta.=0.74 (s, 3H),
0.92 (s, 3H), 1.15 (s, 3H), 1.34 (d, 1H), 1.45-1.61 (m, 3H), 1.78
(br s, 1H), 1.91 (d, 1H), 3.18 (dd, 2H), 4.28 (br s, 1H), 5.79 (s,
2H), 7.09-7.26 (m, 4H), 7.30-7.42 (m, 1H), 8.21 (s, 2H), 8.61 (d,
1H), 8.82 (d, 1H).
[0286] The examples listed in the following table can be prepared
from the appropriate starting compounds in analogy to the method of
example I: TABLE-US-00006 Ex. No. Structure Analytical data 2
##STR68## LC/MS (method A): R.sub.t = 1.70 min. MS (ESIpos): m/z =
430 (M + H).sup.+.sup.1H-NMR (300 MHz DMSO-d.sub.6): .delta.
=1.95-2.24 (m, 2H), 2.79 (s, 3H), 3.28-3.41 (m, 3H), 3.49-3.75 (m,
2H), 3.85 (q, 1H), 4.56 (q, 1H), 5.82 (s, 2H), 7.10-7.29 (m, 3H),
7.32-7.46 (m, 2H), 8.34 (d, 2H), 8.64 (d, 1H), 8.83 (d, 1H). 3
##STR69## LC/MS (method D): R.sub.t = 4.22 min. MS (ESIpos): m/z =
443.4 (M + H).sup.+. 4 ##STR70## LC/MS (method A): R.sub.1 = 1.82
min. MS (ESIpos): m/z = 446 (M + H).sup.+.sup.1H-NMR (200 MHz,
DMSO-d.sub.6): .delta. =1.70-2.32 (m, 4H), 3.26-3.70 (m, 5H),
3.80-4.19 (m, 4H), 4.34 (br s, 2H), 5.82 (s, 2H), 7.09-7.48 (m,
5H), 8.30 (s, 2H), 8.64 (d, 1H), 8.84 (d, 1H). 5 ##STR71## LC/MS
(method A): R.sub.t = 1.67 min. MS (ESIpos): m/z = 434 (M +
H).sup.+.sup.1H-NMR (300 MHz, DMSO-d.sub.6): .delta. =1.53-1.68 (m,
1H), 1.69-1.84 (m, 2H), 1.90-2.07 (m, 1H), 2.63 (q, 1H), 2.92
(quintet, 1H), 3.18 (s, 3H), 3.19-3.30 (m, 2H), 3.33-3.43 (dd, 2H),
5.80 (s, 2H), 7.09-7.25 (m, 4H), 7.33-7.46 (m, 1H), 8.40 (s, 2H),
8.62 (d, 1H), 8.82 (d, 1H). 6 ##STR72## LC/MS (method A): R.sub.t =
2.65 min. MS (ESIpos): m/z = 435 (M + H).sup.+.sup.1H-NMR (400 MHz,
DMSO-d.sub.6): .delta. = 3.36 (s, 6H), 3.43-3.57 (m, 4H), 4.04 (s,
2H), 5.81 (s, 2H), 7.13-7.27 (m, 3H), 7.33-7.41 (m, 2H), 8.29 (s,
2H), 8.63 (d, 1H), 8.82 (d, 1H). 7 ##STR73## LC/MS (method C):
R.sub.t = 4.43 min. MS (ESIpos): m/z = 419.3 (M +
H).sup.+.sup.1H-NMR (300 MHz, DMSO-d.sub.6): .delta. = 1.12 (t,
3H), 2.10 (q, 2H), 3.36-3.58 (m, 6H), 4.25 (br s, 1H), 5.81 (s,
2H), 7.08-7.42 (m, 5H), 8.27 (s, 2H), 8.63 (d, 1H), 8.83 (d, 1H). 8
##STR74## LC/MS (method D): R.sub.t = 4.33 min. MS (ESIpos): m/z =
419.4 (M + H).sup.+.sup.1H-NMR (300 MHz, DMSO-d.sub.6): .delta.
=1.41-1.59 (m, 2H), 1.76-1.89 (m, 1H), 1.90-2.02 (m, 1H), 3.03-3.18
(m, 2H), 3.30 (s, 3H), 3.45-3.61 (m, 2H), 3.69-3.71 (d, 1H), 5.80
(s, 2H), 7.10-7.27 (m, 3H), 7.30-7.43 (m, 2H), 8.62 (d, 3H), 8.81
(d, 1H).
EXAMPLE 9
3-[5-(2,5-Diazabicyclo[2.2.1]hept-2-yl)-2-pyrimidinyl]-1-(2-fluorobenzyl)--
1H-pyrazol-[3,4-b]pyridine
[0287] ##STR75##
[0288] 250 mg (0.50 mmol) of tert-butyl
5-{2-[1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]-pyridin-3-yl]-5-pyrimidinyl}--
2,5-diazabicyclo[2.2.1]heptane-2-carboxylate (example VI, step 4)
are dissolved in 2 ml of DCM, and 2 ml of TFA are added. The
mixture is stirred at RT for one hour. It is diluted with DCM, and
the solution is made basic with aqueous sodium carbonate solution.
The organic phase is separated off, washed with saturated aqueous
sodium chloride solution and dried. The solvent is removed in vacuo
to result in 163 mg (82% of theory) of the product.
[0289] LC/MS (method D): R.sub.t=2.65 min.
[0290] MS (ESIpos): m/z=402.5 (M+H).sup.+
[0291] .sup.1H-NMR (300 MHz, DMSO-d.sub.6): .delta.=1.76 (dd, 2H),
2.85 (dd, 2H), 3.07 (d, 1H), 3.56 (d, 1H), 3.69 (s, 1H), 4.59 (s,
1H), 5.80 (s, 2H), 7.09-7.28 (m, 3H), 7.30-7.43 (m, 2H), 8.30 (s,
2H), 8.62 (d, 1H), 8.81 (d, 1H).
[0292] The examples listed in the following table can be prepared
from the appropriate starting compounds in analogy to the method of
example 9: TABLE-US-00007 Ex. No. Structure Analytical data 10
##STR76## LC/MS (method A): R.sub.t = 1.68 min. MS (ESIpos): m/z =
432 (M + H).sup.+.sup.1H-NMR (200 MHz, DMSO-d.sub.6): .delta.
=3.03-3.47 (m, 7H), 3.85-4.00 (m, 3H), 4.11 (br s, 1H), 5.83 (s,
2H), 7.08-7.47 (m, 5H), 8.61 (s, 2H), 8.64 (d, 1H), 8.84 (d, 1H).
11 ##STR77## LC/MS (method A): R.sub.t = 1.75 min. MS (ESIpos): m/z
= 456 (M + H).sup.+.sup.1H-NMR (200 MHz, DMSO-d.sub.6): .delta. =
2.03 (quintet, 1H), 2.15 (quintet, 1H), 2.69 (t, 3H), 2.77 (q, 1H),
3.38-3.65 (m, 7H), 5.80 (s, 2H), 7.09-7.19 (m, 3H), 7.32-7.41 (m,
2H), 8.25 (s, 2H), 8.62 (d, 1H), 8.83 (d, 1H). 12 ##STR78## LC/MS
(method A): R.sub.t = 1.71 min. MS (ESIpos): m/z = 404 (M +
H).sup.+.sup.1H-NMR (200 MHz, DMSO-d.sub.6): .delta. =1.77-2.26 (m,
3H), 2.32 (s, 3H), 3.09-3.22 (m, 1H), 3.33-3.60 (m, 4H), 5.80 (s,
2H), 7.06-7.45 (m, 5H), 8.24 (s, 2H), 8.62 (d, 1H), 8.84 (d,
1H).
EXAMPLE 13
2-{2-[1-(2-Fluorobenzyl)-1H-pyrazol[3,4-b]pyridin-3-yl]-5-pyrimidinyl}-cyc-
lohexanone
[0293] ##STR79##
[0294] The compound is prepared in analogy to the method of example
1 apart from the following modifications. The reaction is carried
out in absolute dioxane with sodium tert-butoxide instead of the
corresponding potassium compound and at 70.degree. C. Starting from
100 mg (0.26 mmol) of
3-(5-bromo-2-pyrimidinyl)-1-(2-fluorobenzyl)-1H-pyrazol[3,4-b]pyridine
(example I, step 6) and 77 mg (0.78 mmol) of cyclohexanone, 31 mg
(29% of theory) of the product are obtained.
[0295] LC/MS (method D): R.sub.t=4.26 min.
[0296] MS (ESIpos): m/z=402.3 (M+H).sup.+
[0297] R.sub.f=0.40 (toluene/ethyl acetate 1:1)
[0298] .sup.1H-NMR (200 MHz, DMSO-d.sub.6): .delta.=1.70-2.43 (m
7H), 2.54-2.72 (m, 1H), 3.99 (dd, 1H), 5.87 (s, 2H), 7.11-7.50 (m,
5H), 8.68 (d, 1H), 8.70 (s, 2H), 8.89 (d, 1H).
[0299] The example detailed in the following table can be prepared
from the appropriate starting compound in analogy to the method of
example 13: TABLE-US-00008 Ex. No. Structure Analytical data 14
##STR80## LC/MS (method C): R.sub.t = 4.73 min. MS (ESIpos): m/z =
430.4 (M + H).sup.+R.sub.f = 0.56 (toluene/ethyl acetate)
.sup.1H-NMR (200 MHz, DMSO-d.sub.6): .delta. = 1.06 (s, 3H), 1.32
(s, 3H), 1.61-1.95 (m, 3H), 2.01-2.38 (m, 2H), 2.62-2.89 (m, 1H),
4.13 (dd, 1H), 5.87 (s, 2H), 7.21 (q, 3H), 7.32-7.50 (m, 2H), 8.68
(d, 1H), 8.75 (s, 2H), 8.88 (d, 1H).
EXAMPLE 15
1-(2-Fluorobenzyl)-3-[5-(5-isopropyl-2,5-diazabicyclo[2.2.1]hept-2-yl)-2-p-
yrimidinyl]-1H-pyrazol[3,4-b]pyridine
[0300] ##STR81##
[0301] 50 mg (0.13 mmol) of
3-[5-(2,5-diazabicyclo[2.2.1]hept-2-yl)-2-pyrimidinyl]-1-(2-fluorobenzyl)-
-1H-pyrazolo[3,4-b]pyridine (example 9) are dissolved in 5 ml of
absolute acetone, and 92 mg (0.87 mmol) of sodium carbonate are
added. 64 mg (0.37 mmol) of 2-iodopropane are added to the
suspension, and the mixture is stirred at RT overnight. The
reaction solution is mixed with water and extracted with DCM. The
organic phases are combined, washed with saturated aqueous sodium
chloride solution, dried and filtered. The solvent is removed in
vacuo, and the residue is purified by preparative HPLC with
addition of small portions of aqueous hydrochloric acid. 25 mg (42%
of theory) of the product are obtained.
[0302] LC/MS (method A): R.sub.t=1.78 min.
[0303] MS (ESIpos): m/z=444 (M+H).sup.+.
EXAMPLE 16
5-{2-[1-(2-Fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl]-5-pyrimidinyl}-2,-
2-dimethyl-5-aza-2-azoniabicyclo[2.2.1]heptane chloride
[0304] ##STR82##
[0305] The compound is prepared in analogy to the method for
example 15 using the appropriate starting materials. 51 mg (88% of
theory) of the product are obtained.
[0306] LC/MS (method A): R.sub.t=1.65 min.
[0307] MS (ESIpos): m/z=430 (M+H).sup.+
[0308] .sup.1H-NMR (200 MHz, DMSO-d.sub.6): .delta.=2.34 (d, 1H),
2.71 (d, 1H), 3.11 (s, 3H), 3.28 (s, 3H), 3.62-3.76 (m, 3H), 4.64
(s, 1H), 4.90 (s, 1H), 5.82 (s, 2H), 7.11-7.29 (m, 3H), 7.32-7.44
(m, 2H), 8.44 (s, 2H), 8.63 (d, 1H), 8.82 (d, 1H).
EXAMPLE 17
1-(2-Fluorobenzyl)-3-[5-(5-methyl-2,5-diazabicyclo[2.2.1]hept-2-yl)-2-pyri-
midinyl-1H-pyrazolo[3,4-b]pyridine
[0309] ##STR83##
[0310] 40 mg (0.10 mmol) of
3-[5-(2,5-diazabicyclo[2.2.1]hept-2-yl)-2-pyrimidinyl]-1-(2-fluorobenzyl)-
-1H-pyrazolo[3,4-b]pyridine (example 9) are dissolved in 0.5 ml of
absolute DMF. 542 mg (6.67 mmol) of aqueous formaldehyde solution
(37% strength) and 1220 mg (26.51 mmol) of formic acid are added to
this solution, and the reaction mixture is heated at 80.degree. C.
for 16 hours. The reaction solution is made basic with 1 molar
sodium hydroxide solution and extracted with DCM. The organic phase
is washed with saturated aqueous sodium chloride solution and
dried, and the solvent is removed in vacuo. 39 mg (94% of theory)
of the product are obtained.
[0311] HPLC: R.sub.t=3.39 min.
[0312] LC/MS (method C): R.sub.t=2.61 min.
[0313] MS (ESIpos): m/z=416.24 (M+H).sup.+
[0314] .sup.1H-NMR (400 MHz, DMSO-d.sub.6): .delta.=1.78 (d, 1H),
1.93 (d, 1H), 2.28 (s, 3H), 2.73 (s, 1H), 2.81 (d, 1H), 2.89 (s,
1H), 3.32 (d, 1H), 3.38 (d, 1H), 3.51 (s, 1H), 5.81 (s, 2H),
7.10-7.28 (m, 3H), 7.32-7.43 (m, 2H), 8.32 (s, 2H), 8.62 (d, 1H),
8.81 (d, 1H).
EXAMPLE 18
2-{2-[1-(2-Fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl]-5-pyrimidinyl}-9--
methyl-6-oxa-2,9-diazaspiro[4.5]decane hydrochloride
[0315] ##STR84##
[0316] The compound is prepared from example 11 in analogy to the
method for example 17. 49 mg (88% of theory) of the product are
obtained. The hydrochloride is formed during the purification by
HPLC with addition of small portions of hydrochloric acid.
[0317] LC/MS (method D): R.sub.t=2.78 min.
[0318] MS (ESIpos): m/z=460.4 (M+H).sup.+
[0319] .sup.1H-NMR (300 MHz, DMSO-d.sub.6): .delta.=2.09-2.40 (m,
2H), 2.57-2.74 (m, 1H), 2.80 (s, 3H), 3.00-3.25 (m, 2H), 3.29-3.70
(m, 6H), 3.80-4.03 (m, 3H), 5.81 (s, 2H), 7.10-7.29 (m, 3H),
7.33-7.45 (m, 2H), 8.26 (d, 2H), 8.63 (d, 1H), 8.84 (t, 1H), 11.20
(br s, 1H).
EXAMPLE 19
1-(2-Fluorobenzyl)-3-[5-(8-oxa-3-azabicyclo[3.2.1]oct-3-yl)-2-pyrimidinyl]-
-1H-pyrazolo[3,4-b]pyridine
[0320] ##STR85##
[0321] 400 mg (0.68 mmol) of
3-[4,6-dichloro-5-(8-oxa-3-azabicyclo[3.2.1]oct-3-yl)-2-pyrimidinyl]-1-(2-
-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridine (example XII, step 7) are
dissolved in 200 ml of methanol, and 86 mg of ammonium formate are
added. Under argon, 26 mg of palladium on activated carbon (10%)
are added, and the mixture is heated under reflux for 3 days. The
reaction mixture is filtered and the residues are washed with
methanol. The solvent is removed in vacuo, and the residue is
purified by preparative HPLC. 99 mg (35% of theory) of the product
are obtained.
[0322] LC/MS (method D): R.sub.t=3.97 min.
[0323] MS (ESIpos): m/z=417 (M+H).sup.+
[0324] .sup.1H-NMR (200 MHz, DMSO-d.sub.6): .delta.=1.88 (s, 4H),
2.98 (dd, 2H), 3.61 (d, 1H), 4.49 (s, 2H), 5.82 (s, 2H), 7.09-7.46
(m, 5H), 8.53 (s, 2H), 8.64 (dd, 1H), 8.82 (dd, 1H).
EXAMPLE 20
1-(2-Fluorobenzyl)-3-{5-[(3S)-3-methoxy-1-pyrrolidinyl]-2-pyrimidinyl}-1H--
pyrazolo[3,4-b]pyridine
[0325] ##STR86##
[0326] 100 mg (0.21 mmol, purity 80%) of
(3S)-1-{2-[1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl]-5-pyrimidin-
yl}-3-pyrrolidinol (example XIX, step 3) are dissolved in 2 ml of
DMF under argon and, while cooling in an ice bath 8 mg (0.33 mmol)
of sodium hydride are added. 32 mg (0.23 mmol) of iodomethane are
added dropwise to the suspension, likewise while cooling in an ice
bath, and the mixture is stirred at this temperature for 2 hours.
0.5 ml of distilled water is added, and the reaction mixture is
chromatographed directly on a preparative HPLC. 35 mg (42% of
theory) of the product are obtained.
[0327] LC/MS (method D): R.sub.t=4.12 min.
[0328] MS (ESIpos): m/z=405.4 (M+H).sup.+
[0329] .sup.1H-NMR (300 MHz, DMSO-d.sub.6): .delta.=2.05-2.18 (m,
2H), 3.29 (s, 3H), 3.34-3.57 (m, 4H), 4.14 (br s, 1H), 5.80 (s,
2H), 7.10-7.28 (m, 3H), 7.29-7.43 (m, 2H), 8.26 (s, 2H), 8.61 (d,
1H), 8.81 (d, 1H).
[0330] The examples listed in the following table can be prepared
from the appropriate starting compounds in analogy to the method of
example 20: TABLE-US-00009 Ex. No. Structure Analytical data 21
##STR87## LC/MS (method D): R.sub.t = 4.12 min. MS (ESIpos): m/z =
405.3 (M + H).sup.+.sup.1H-NMR (300 MHz, DMSO-d.sub.6): .delta.
=2.03-2.19 (m, 2H), 3.29 (s, 3H), 3.35-3.53 (m, 4H), 4.15 (br s,
1H), 5.81 (s, 2H), 7.10-7.26 (m, 3H), 7.29-7.44 (m, 2H), 8.28 (d,
1H), 8.82 (d, 1H). 22 ##STR88## HPLC: R.sub.t = 4.69 min. MS
(ESIpos): m/z = 426 (M + H).sup.+R.sub.f = 0.62 (DCM/methanol 20:1)
.sup.1H-NMR (300 MHz, DMSO-d.sub.6): .delta. = 0.45 (q, 1H), 0.82
(quintet, 1H), 0.90-0.97 (m, 1H), 1.06-1.14 (m, 1H), 1.97-2.15 (m,
1H), 3.81 (s, 2H), 3.92 (s, 1H), 5.87 (s, 2H), 7.17 (q, 1H), 7.22
(q, 2H), 7.36 (t, 1H), 7.44 (dd, 1H), 8.18 (s, 1H), 8.68 (d, 1H),
8.90 (d, 1H), 9.13 (d, 2H).
EXAMPLE 23
3-[5-(1,3-Benzodioxol-5-yl)-2-pyrimidinyl]-1-(2-fluorobenzyl)-1H-pyrazolo[-
3,4-b]-pyridine
[0331] ##STR89##
[0332] 120 mg (0.31 mmol) of
3-(5-bromo-2-pyrimidinyl)-1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridine
(example I, step 6) are dissolved in 10 ml of DME under argon, and
67 mg (0.41 mmol) of 1,3-benzodioxol-5-yl-boronic acid are added.
The mixture is heated to 40.degree. C. until a solution is
produced, and then 17 mg (0.02 mmol) of
tetrakis(triphenylphosphine)palladium(0) are added. The mixture is
stirred under reflux for one hour, then 39 mg (0.34 mmol) of
potassium tert-butoxide are added, and the mixture is then stirred
at 85.degree. C. overnight. It is diluted with DCM and extracted
once each with 1 molar hydrochloric acid and saturated aqueous
sodium bicarbonate solution. The organic phase is dried over
magnesium sulfate and filtered, and the solvent is removed in
vacuo. The residue is purified by preparative HPLC. 60 mg (92% of
theory) of the product are obtained.
[0333] LC/MS (method D): R.sub.t=4.69 min.
[0334] MS (ESIpos): m/z=426.2 (M+H).sup.+
[0335] R.sub.f=0.77 (toluene/ethyl acetate 1:1)
[0336] .sup.1H-NMR (300 MHz, DMSO-d.sub.6): .delta.=5.87 (s, 2H),
6.11 (s, 2H), 7.05-7.39 (m, 5H), 7.44 (q, 1H), 7.51 (d, 1H),
7.54-7.68 (m, 1H), 8.68 (d, 1H), 8.90 (d, 1H), 9.22 (s, 2H).
[0337] The examples listed in the following table can be prepared
from the appropriate starting compounds in analogy to the method of
example 23: TABLE-US-00010 Ex. No. Structure Analytical data 24
##STR90## LC/MS (method D): R.sub.t = 4.77 min. MS (ESIpos): m/z =
412.2 (M + H).sup.+R.sub.f = 0.75 (toluene/ethyl acetate 1:1)
.sup.1H-NMR (300 MHz, DMSO-d.sub.6): .delta. = 3.98 (s, 3H), 6.02
(s, 2H), 7.28 (t, 3H), 7.36 (q, 2H), 7.51 (q, 1H), 7.59 (dd, 1H),
7.98 (d, 2H), 8.83 (d, 1H), 9.06 (d, 1H), 9.38 (s, 2H). 25
##STR91## LC/MS (method D): R.sub.t = 4.80 min. MS (ESIpos): m/z =
412.2 (M + H).sup.+R.sub.f = 0.80 (toluene/ethyl acetate 1:1)
.sup.1H-NMR (300 MHz, DMSO-d.sub.6): .delta. = 3.86 (s, 2H), 5.88
(s, 2H), 7.05 (d, 1H), 7.16 (q, 1H), 7.23-7.53 (m, 7H), 8.68 (d,
1H), 8.91 (d, 1H), 9.28 (s, 2H). 26 ##STR92## LC/MS (method D):
R.sub.t = 4.82 min. MS (ESIpos): m/z = 400.5 (M +
H).sup.+.sup.1H-NMR (200 MHz, DMSO-d.sub.6): .delta. = 5.90 (s,
2H), 7.10-7.64 (m, 8H), 7.79 (t, 1H), 8.71 (d, 1H), 8.93 (d, 1H),
9.19 (s, 2H). 27 ##STR93## LC/MS (method D): R.sub.t = 4.86 min. MS
(ESIpos): m/z = 412.48 (M + H).sup.+.sup.1H-NMR (300 MHz,
DMSO-d.sub.6): .delta. = 3.85 (s, 3H), 5.89 (s, 2H), 7.09-7.57 (m,
9H), 8.69 (d, 1H), 8.93 (d, 1H), 9.10 (s, 2H). 28 ##STR94## LC/MS
(method D): R.sub.t = 5.07 min. MS (ESIpos): m/z = 450.22 (M +
H).sup.+.sup.1H-NMR (300 MHz, CDCl.sub.3): .delta. = 6.00 (s, 2H),
6.94-7.12 (m, 3H), 7.18-7.28 (m, 1H), 7.32 (dd, 1H), 7.63-7.91 (m,
4H), 8.64 (d, 1H), 8.99 (d, 1H), 9.12 (s, 2H). 29 ##STR95## LC/MS
(method D): R.sub.t = 4.55 min. MS (ESIpos): m/z = 407.24 (M +
H).sup.+.sup.1H-NMR (300 MHz, DMSO-d.sub.6): .delta. = 5.90 (s,
2H), 7.18 (q, 1H), 7.23-7.43 (m, 2H), 7.47 (dd, 1H), 7.78 (t, 1H),
7.96 (d, 1H), 8.25 (d, 1H), 8.44 (s, 1H), 8.70 (d, 1H), 8.92 (d,
1H), 9.37 (s, 2H).
EXAMPLE 30
(2-{2-[1-(2-Fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl]-5-pyrimidinyl}ph-
enyl)-methanol
[0338] ##STR96##
[0339] 200 mg (0.52 mmol) of
3-(5-bromo-2-pyrimidinyl)-1-(2-fluorobenzyl)-1H-pyrazolo-[3,4-b]pyridine
(example I, step 6), 90 mg (0.62 mmol) of
2-(hydroxymethyl)-phenylboronic acid, 40 mg (0.05 mmol) of
1,1'-bis(diphenylphosphino)-ferrocenepalladium(II) chloride and 200
mg (0.62 mmol) of cesium carbonate are taken up in 2 ml of DME and
stirred under reflux overnight. The solvent is removed under
vacuum, and the residue is purified by preparative HPLC to result
in 111 mg (52% of theory) of the product.
[0340] HPLC: R.sub.t=4.53 min.
[0341] LC/MS (method C): R.sub.t=4.17 min.
[0342] MS (ESIpos): m/z=412 (M+H).sup.+
[0343] .sup.1H-NMR (200 MHz, CDCl.sub.3): .delta.=1.26 (t, 1H),
4.65 (d, 2H), 6.00 (s, 2H), 6.92-7.70 (m, 9H), 8.64 (d, 1H), 9.00
(s, 2H), 9.03 (d, 1H).
EXAMPLE 31
1-(2-Fluorobenzyl)-3-[5-(2-fluor-4-pyridinyl)-2-pyrimidinyl]-1H-pyrazolo[3-
,4-b]-pyridine
[0344] ##STR97##
[0345] 120 mg (0.31 mmol) of
3-(5-bromo-2-pyrimidinyl)-1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridine
(example I, step 6) are dissolved in 10 ml of DMF under argon, and
121 mg (0.31 mmol) of 2-fluoro-4-(tributylstannyl)pyridine (example
XX) and 13 mg (0.02 mmol) of
dichlorobis(triphenylphosphine)palladium are added. The reaction
mixture is stirred at 110.degree. C. overnight. It is diluted with
DCM and extracted with saturated aqueous ammonium chloride
solution. The organic phase is dried over magnesium sulfate and
filtered, and the solvent is removed in vacuo. The residue is
purified by preparative HPLC. 41 mg (32% of theory) of the product
are obtained.
[0346] LC/MS (method D): R.sub.t=4.17 min.
[0347] MS (ESIpos): m/z=401.25 (M+H).sup.+
[0348] R.sub.f=0.67 (toluene/ethyl acetate 2:1)
[0349] .sup.1H-NMR (300 MHz, DMSO-d.sub.6): .delta.=5.91 (s, 2H),
7.18 (q, 1H), 7.22-7.43 (m, 3H), 7.48 (dd, 1H), 7.91 (t, 1H), 8.63
(d, 1H), 8.71 (d, 1H), 8.80 (d, 1H), 8.93 (d, 1H), 9.30 (s,
2H).
[0350] The examples listed in the following table can be prepared
from the appropriate starting compounds in analogy to the method of
example 31: TABLE-US-00011 Ex. No. Structure Analytical data 32
##STR98## LC/MS (method C): R.sub.t = 4.31 min. MS (ESIpos): m/z =
401.5 (M + H).sup.+R.sub.f = 0.27 (toluene/ethyl acetate 2:1)
.sup.1H-NMR (200 MHz, DMSO-d.sub.6): .delta. = 5.91 (s, 2H),
7.11-7.42 (m, 4H), 7.48 (dd, 1H), 7.59 (t, 1H), 8.34-8.48 (m, 2H),
8.72 (d, 1H), 8.92 (d, 1H), 9.25 (s, 2H). 33 ##STR99## HPLC:
R.sub.t = 4.90 min. MS (ESIpos): m/z = 413.1 (M + H).sup.+R.sub.f =
0.33 (DCM/methanol 20:1) .sup.1H-NMR (400 MHz, DMSO-d.sub.6):
.delta. =1.03-1.11 (m, 2H), 1.18-1.29 (m, 2H), 2.45-2.54 (m, 1H),
5.89 (s, 2H), 7.16 (t, 1H), 7.22-7.30 (m, 2H), 7.35-7.41 (m, 1H),
7.46 (dd, 1H), 8.70 (d, 1H), 8.91 (d, 1H), 9.09 (s, 1H), 9.23 (s,
2H). 34 ##STR100## HPLC: R.sub.t = 5.18 min. MS (ESIpos): m/z = 472
(M + H).sup.+R.sub.f = 0.66 (DCM/ethyl acetate 1:1) .sup.1H-NMR
(300 MHz, DMSO-d.sub.6): .delta. = 1.08 (t, 3H), 4.13 (q, 2H), 5.90
(s, 2H), 7.11-7.60 (m, 7H), 8.11 (dd, 1H), 8.70 (d, 1H), 8.81 (d,
3H). 35 ##STR101## HPLC: R.sub.t = 5.16 min. MS (ESIpos): m/z = 472
(M + H).sup.+R.sub.f = 0.66 (DCM/ethyl acetate 1:1) .sup.1H-NMR
(200 MHz, DMSO-d.sub.6): .delta. = 1.09 (t, 3H), 4.16 (q, 2H), 5.90
(s, 2H), 7.11-7.51 (m, 5H), 7.44 (dd, 1H), 7.68 (d, 1H), 7.82 (d,
1H), 8.70 (d, 1H), 8.92 (d, 3H).
EXAMPLE 36
3-[5-(5-Cyclopropyl-1H-pyrazol-4-yl)-2-pyrimidinyl]-1-(2-fluorobenzyl)-1H--
pyrazolo[3,4-b]pyridine
[0351] ##STR102##
[0352] 90 mg (0.20 mmol) of
(2E)-1-cyclopropyl-3-(dimethylamino)-2-{2-[1-(2-fluorobenzyl)-1H-pyrazolo-
[3,4-b]pyridin-3-yl]-5-pyrimidinyl}-2-propen-1-one (example XXVI,
step 2) are dissolved in 3 ml of absolute methanol under argon. 102
mg (2.03 mmol) of hydrazine hydrate are added, and the mixture is
stirred under reflux for 2 hours. The solvent is removed in vacuo,
and the residue is purified by preparative HPLC. 48 mg (58% of
theory) of the product are obtained.
[0353] HPLC: R.sub.t=4.37 min.
[0354] MS (ESIpos): m/z=412 (M+H).sup.+
[0355] R.sub.f=0.36 (DCM/methanol 20:1).
EXAMPLE 37
3-{5-[5-Cyclopropyl-1-(2,2,2-trifluoroethyl)-1H-pyrazol-4-yl]-2-pyrimidiny-
l}-1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridine
[0356] ##STR103##
[0357] The compound is prepared in analogy to the method for
example 36 using 2,2,2-trifluoroethylhydrazine. The yield of the
product is 9% of theory.
[0358] LC/MS (method A): R.sub.t=2.87 min.
[0359] MS (ESIpos): m/z=494 (M+H).sup.+
[0360] R.sub.f=0.70 (DCM/methanol 20:1).
EXAMPLE 38
1-{2-[1-(2-Fluorobenzyl)-1H-pyrazol[3,4-b]pyridin-3-yl]-5-pyrimidinyl}-3-p-
yrrolidinone
[0361] ##STR104##
[0362] 100 mg (0.26 mmol) of
(3R)-1-{2-[1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl]-5-pyrimidin-
yl}-3-pyrrolidinol (example XIX, step 3) are introduced into a
freshly prepared solution of 0.11 ml of triethylamine and 33 .mu.l
of DMSO under argon, and the resulting solution is cooled to
0.degree. C. 73 mg (0.46 mmol) of sulfur trioxide-pyridine complex
are added, and the mixture is stirred at 0.degree. C. for one hour.
It is then allowed to warm to RT and is stirred at this temperature
overnight. The reaction solution is mixed with 100 ml of distilled
water and extracted three times with DCM. The organic phase is
washed once each with 1 mol of hydrochloric acid and distilled
water, and the solvent is removed under vacuum. The residue is
purified by preparative HPLC. 5 mg (5% of theory) of the product
are obtained.
[0363] LC/MS (method C): R, =3.85 min.
[0364] MS (ESIpos): m/z=389.4 (M+H).sup.+
[0365] R.sub.f=0.36 (DCM/ethyl acetate 2:1)
[0366] .sup.1H-NMR (200 MHz, DMSO-d.sub.6): .delta.=2.74 (t, 2H),
3.77 (t, 2H), 3.80 (s, 2H), 5.82 (s, 2H), 7.10-7.48 (m, 5H), 8.42
(s, 2H), 8.64 (d, 1H), 8.84 (d, 1H).
EXAMPLE 39
1-(2-Fluorobenzyl)-3-[5-(2-methoxy-4-pyridinyl)-2-pyrimidinyl]-1H-pyrazolo-
-[3,4-b]pyridine
[0367] ##STR105##
[0368] 30 mg (0.08 mmol) of
1-(2-fluorobenzyl)-3-[5-(2-fluoro-4-pyridinyl)-2-pyrimidinyl]-1H-pyrazolo-
[3,4-b]pyridine (example 31) are dissolved in 3 ml of methanol, and
32 mg (0.60 mmol) of sodium methanolate are added. The solution is
stirred under reflux for 3 days. The solution is diluted with DCM
and extracted twice with distilled water and once with saturated
aqueous sodium chloride solution. The organic phase is dried over
magnesium sulfate and filtered, and the solvent is removed in
vacuo. 34 mg of the product are obtained.
[0369] LC/MS (method C): R.sub.t=3.64 min.
[0370] MS (ESIpos): m/z=413.4 (M+H).sup.+
[0371] R.sub.f=0.80 (DCM/methanol 20:1)
[0372] .sup.1H-NMR (400 MHz, DMSO-d.sub.6): .delta.=3.99 (s, 3H),
5.90 (s, 2H), 7.17 (t, 1H), 7.22-7.33 (m, 2H), 7.47 (dd, 1H), 7.63
(d, 1H), 8.38 (d, 1H), 8.58 (s, 1H), 8.71 (d, 1H), 8.93 (d, 1H),
9.21 (s, 2H).
* * * * *