NZ767476A - Novel pyridine and pyrazine compounds as inhibitors of cannabinoid receptor 2 - Google Patents
Novel pyridine and pyrazine compounds as inhibitors of cannabinoid receptor 2Info
- Publication number
- NZ767476A NZ767476A NZ767476A NZ76747619A NZ767476A NZ 767476 A NZ767476 A NZ 767476A NZ 767476 A NZ767476 A NZ 767476A NZ 76747619 A NZ76747619 A NZ 76747619A NZ 767476 A NZ767476 A NZ 767476A
- Authority
- NZ
- New Zealand
- Prior art keywords
- cyclopropylmethoxy
- pyridine
- give
- acid
- compound
- Prior art date
Links
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- 102100007437 CNR2 Human genes 0.000 title abstract description 9
- 230000002401 inhibitory effect Effects 0.000 title abstract 2
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- 230000002335 preservative Effects 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 238000003653 radioligand binding assay Methods 0.000 description 1
- 239000002469 receptor inverse agonist Substances 0.000 description 1
- 238000000611 regression analysis Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 229960004889 salicylic acid Drugs 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- KEAYESYHFKHZAL-UHFFFAOYSA-N sodium Chemical compound [Na] KEAYESYHFKHZAL-UHFFFAOYSA-N 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- PXIPVTKHYLBLMZ-UHFFFAOYSA-N sodium azide Substances [Na+].[N-]=[N+]=[N-] PXIPVTKHYLBLMZ-UHFFFAOYSA-N 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000001384 succinic acid Substances 0.000 description 1
- 235000011044 succinic acid Nutrition 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000000375 suspending agent Substances 0.000 description 1
- 239000006188 syrup Substances 0.000 description 1
- 235000020357 syrup Nutrition 0.000 description 1
- 239000003826 tablet Substances 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
- 229960001367 tartaric acid Drugs 0.000 description 1
- ODGCEQLVLXJUCC-UHFFFAOYSA-N tetrafluoroborate Chemical compound F[B-](F)(F)F ODGCEQLVLXJUCC-UHFFFAOYSA-N 0.000 description 1
- 230000001225 therapeutic Effects 0.000 description 1
- 238000004809 thin layer chromatography Methods 0.000 description 1
- 230000000699 topical Effects 0.000 description 1
- 238000002054 transplantation Methods 0.000 description 1
- YFTHZRPMJXBUME-UHFFFAOYSA-N tripropylamine Chemical compound CCCN(CCC)CCC YFTHZRPMJXBUME-UHFFFAOYSA-N 0.000 description 1
- 230000003827 upregulation Effects 0.000 description 1
- 230000002792 vascular Effects 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
Abstract
The invention relates to a compound of formula (I) wherein A, A2, X and R1-R3are as defined in the description and in the claims. The compound of formula (I) can be used as a medicament, due to its inhibition of cannabinoid receptor 2.
Description
NOVEL NE AND PYRAZINE COMPOUNDS
AS TORS OF CANNABINOID RECEPTOR 2
The present invention relates to c compounds useful for therapy and/or
prophylaxis in a mammal, and in particular to compounds that are preferential agonists of
the Cannabinoid Receptor 2.
The invention relates in particular to a compound of formula (I)
wherein
R1 is alkoxyazetidinyl, dihaloazetidinyl or pyrrolidinyl;
R2 and R3 are ndently selected from hydrogen and alkyl;
A1 is -CH- or nitrogen;
A2 is -CH2- or carbonyl;
X is halogen;
n is 0 to 3; and
m is 0 or 1;
provided that m and n are not both 0 at the same time;
or a pharmaceutically acceptable salt thereof.
Novel pyridine and pyrazine derivatives that have high affinity and great selectivity
towards the inoid CB2 or have been found. These compounds have a
tory effect on the ty of the CB2 receptor. The term ‘modulatory effect’
especially means agonist, antagonist and/or inverse agonist effects.
Agonists of the Cannabinoid Receptor 2 are useful for therapy and/or prophylaxis in
a mammal. The compound of formula (I) is ularly useful in the treatment or
prophylaxis of e. g. pain, atherosclerosis, age-related macular degeneration, diabetic
pathy, glaucoma, diabetes mellitus, inflammation, inflammatory bowel disease,
ischemia-reperfiision injury, acute liver failure, liver fibrosis, lung fibrosis, kidney
fibrosis, systemic fibrosis, acute allograft rejection, chronic allograft nephropathy, diabetic
nephropathy, glomerulonephropathy, cardiomyopathy, heart failure, myocardial
ischemia/infarction, systemic sclerosis, thermal injury, burning, hypertrophic scars,
keloids, gingivitis pyrexia, liver cirrhosis or tumors, regulation of bone mass,
neurodegeneration, stroke, transient ischemic attack or uveitis.
Inverse ts of the inoid Receptor 2 are useful for y and/or
prophylaxis in a mammal.
The compound of formula (I) is particularly useful in the treatment or prophylaxis of
pain, athic pain, asthma, osteoporosis, inflammation, psychiatric diseases,
psychosis, oncology, encephalitis, malaria, allergy, immunological disorders, arthritis,
gastrointestinal disorders, psychiatric disorders toid arthritis, psychosis and allergy.
The inoid receptors are a class of cell membrane receptors belonging to the G
protein-coupled receptor superfamily. There are currently two known subtypes, termed
Cannabinoid Receptor 1 (CB1) and Cannabinoid or 2 (CB2). The CB1 receptor is
mainly expressed in the central nervous (i.e. amygdala cerebellum, hippocampus) system
and to a lesser amount in the periphery. CB2, which is encoded by the CNR2 gene, is
mostly expressed peripherally, on cells of the immune system, such as macrophages and
s (Ashton, J. C. et al. Curr Neuropharmacol 2007, 5(2), 73-80; Miller, A. M. et al. Br
J col 2008, 153(2), 299-308; Centonze, D., et al. Curr Pharm Des 2008, ,
2370-42), and in the gastrointestinal system (Wright, K. L. et al. Br J Pharmacol 2008,
153(2), 263-70). The CB2 receptor is also widely distributed in the brain where it is found
primarily on microglia and not neurons (Cabral, G. A. et al. Br J Pharmacol 2008, 153(2):
240-51).
Modulators of the Cannabinoid Receptor 2 are useful for therapy and/or prophylaxis
in a mammal.
The interest in CB2 receptor agonists has been steadily on the rise during the last
decade (currently 30-40 patent applications/year) due to the fact that several of the early
compounds have been shown to have beneficial effects in pre-clinical models for a number
of human diseases including chronic pain (Beltramo, M. Mini Rev Med Chem 2009, 9(1),
11-25), atherosclerosis (Mach, F. et al. J Neuroendocrinol 2008, 20 Suppl 1, 53-7),
regulation of bone mass (Bab, I. et al. Br J Pharmacol 2008, 153(2), 182-8),
neuroinflammation (Cabral, G. A. et al. J Leukoc Biol 2005, 78(6), ),
ischemia/reperfusion injury (Pacher, P. et al. Br J Pharmacol 2008, 153(2), 252-62),
systemic s (Akhmetshina, A. et a1. Arthritis Rheum 2009, 60(4), 1129-36; Garcia-
Gonzalez, E. et a1. Rheumatology (Oxford) 2009, 48(9), 1050-6), liver fibrosis (Julien, B.
et a1. enterology 2005, 128(3), 742-55; Munoz—Luque, J. et al. J Pharmacol Exp
Ther 2008, 324(2), 475-83).
Ischemia/reperfusion (I/R) injury is the principal cause of tissue damage occurring in
conditions such as stroke, myocardial tion, cardiopulmonary bypass and other
vascular surgeries, and organ transplantation, as well as a major ism of end—organ
damage cating the course of circulatory shock of s etiologies. All these
conditions are characterized by a disruption of normal blood supply resulting in an
insufficient tissue oxygenation. Re-oxygenation e.g., reperfusion is the ultimate treatment
to restore normal tissue oxygenation. However the absence of oxygen and nutrients from
blood creates a condition in which the restoration of circulation results in further tissue
damage. The damage of reperfusion injury is due in part to the inflammatory response of
damaged tissues. White blood cells, carried to the area by the newly returning blood,
release a host of inflammatory factors such as interleukins as well as free radicals in
response to tissue damage. The restored blood flow reintroduces oxygen within cells that
damages cellular proteins, DNA, and the plasma membrane.
Remote ischemic preconditioning (RIPC) represents a gy for harnessing the
body’s endogenous protective capabilities against the injury incurred by ischemia and
usion. It describes the intriguing phenomenon in which transient non-lethal ischemia
and reperfusion of one organ or tissue confers resistance to a subsequent episode of
“lethal” ischemia reperfusion injury in a remote organ or tissue. The actual mechanism
through which transient ischemia and reperfusion of an organ or tissue s protection
is currently unknown although several eses have been ed.
The humoral hypothesis es that the endogenous substance (such as adenosine,
bradykinin, opioids, CGRP, endocannabinoids, Angiotensin I or some other as yet
unidentified humoral factor) generated in the remote organ or tissue enters the blood
stream and activates its respective receptor in the target tissue and thereby ting the
various intracellular pathways of cardioprotection ated in ischemicpreconditioning.
Recent data indicates that nnabinnoids and their receptors, in particular CB2
might be involved in pre-conditioning and contribute to prevent reperfiision injury by
downregulation of the inflammatory response (Pacher, P. et al. Br J Pharmacol 2008,
153(2), 252-62). Specifically, recent studies using CB2 tool ts demonstrated the
efficacy of this concept for reducing the I/R injury in the heart (Defer, N. et al. Faseb J
2009, 23(7), 2120-30), the brain (Zhang, M. et al. J Cereb Blood Flow Metab 2007, 27(7),
6), the liver (Batkai, S. et al. Faseb J 2007, 21(8), 1788-800) and the kidney (Feizi,
A. et al. Exp Toxicol Pathol 2008, 60(4-5), 405-10).
Moreover, over the last few years, a growing body of literature indicates that CB2
can also be of interest in sub-chronic and chronic setting. Specific upregulation of CB1
and CB2 has been shown to be associated in animal models of chronic diseases associated
with fibrosis (Garcia-Gonzalez, E. et al. Rheumatology d) 2009, 48(9), ;
Yang, Y. Y. et al. Liver Int 2009, 29(5), 678-85) with a relevant expression of CB2 in
myofibroblasts, the cells responsible for fibrosis progression.
Activation of CB2 receptor by ive CB2 t has in fact been shown to exert
anti-fibrotic effect in diffuse systemic sclerosis (Garcia-Gonzalez, E. et al. Rheumatology
(Oxford) 2009, 48(9), 1050-6) and CB2 receptor has emerged as a critical target in
experimental dermal fibrosis (Akhrnetshina, A. et al. tis Rheum 2009, 60(4), 1129-
36) and in in liver pathophysiology, including fibrogenesis associated with c liver
diseases (Lotersztajn, S. et al. Gastroenterol Clin Biol 2007, 31(3), 255-8; Mallat, A. et al.
Expert Opin Ther Targets 2007, 11(3), 403-9; Lotersztajn, S. et al. Br J Pharmacol 2008,
153(2), 286-9).
Inverse ts of the Cannabinoid Receptor 2 are useful for therapy and/or
prophylaxis in a mammal.
The compound of a (I) is particularly useful in the treatment or prophylaxis of
pain, neuropathic pain, asthma, osteoporosis, inflammation, psychiatric diseases,
psychosis, oncology, encephalitis, malaria, allergy, immunological disorders, arthritis,
gastrointestinal disorders, psychiatric disorders rheumatoid arthritis, psychosis and allergy.
The interest in CB2 or ligands has been steadily on the rise during the last
decade (currently 30-40 patent applications/year). Evidence from different s support
the view that lipid endocannabinoid signaling through CB2 receptors represents an aspect
of the ian protective armamentarium (Pacher, P. Prog Lipid Res 2011, 50, 193).
Its modulation by either selective CB2 receptor agonists or inverse agonists/antagonists
(depending on the disease and its stage) holds unique therapeutic potential in a huge
number of diseases. For CB2 inverse agonists/antagonists eutic opportunities have
been demonstrated for many pathological conditions ing pain (Pasquini, S. J Med
Chem 2012, 55(11): 5391), athic pain (Garcia-Gutierrez, M.S. Br J col
2012, 165(4): 951), psychiatric disorders (Garcia-Gutierrez, M.S. Br J col 2012,
165(4): 951), psychosis (Garcia-Gutierrez, M.S. Br J Pharmacol 2012, 165(4): 951),
osteoporosis and ation (Sophocleous, A. Calcif Tissue Int 2008, 82(Suppl. 1):Abst
OC18), psychiatric diseases and psychosis a-Gutierrez, M.S. Br J Pharmacol 2012,
165(4): 951), oncology (Preet, A. Cancer Prev Res 2011, 4: 65), alitis and malaria
(Zimmer, A. WO 2011045068), allergy and inflammation (Ueda, Y. Life Sci 2007, 80(5):
414), encephalitis and malaria (Zimmer, WO 2011045068), asthma (Lunn, CA. J
col Exp Ther 2006, 316(2): 780), immunological disorders (Fakhfouri, G.
Neuropharmacology 2012, 63(4): 653), rheumatoid arthritis (Chackalamannil, S. US
7776889), arthritis (Lunn, CA. J Pharmacol Exp Ther 2006, 316(2): 780), and
gastrointestinal disorders (Barth, F. FR 2887550 ).
The compounds of the invention bind to and modulate the CB2 receptor and have
lower CB1 or activity.
In the present ption the term ”, alone or in combination, signifies a
straight-chain or branched-chain alkyl group with 1 to 8 carbon atoms, particularly a
straight or branched-chain alkyl group with 1 to 6 carbon atoms and more particularly a
straight or branched-chain alkyl group with 1 to 4 carbon atoms. es of straight-
chain and branched-chain C1-C8 alkyl groups are methyl, ethyl, propyl, isopropyl, butyl,
isobutyl, tert.-butyl, the isomeric pentyls, the isomeric hexyls, the isomeric heptyls and the
isomeric octyls, particularly methyl, ethyl, propyl, butyl and pentyl. Particular examples of
alkyl are methyl, ethyl, isopropyl, butyl, isobutyl, tert.-buty1 and pentyl. Methyl, ethyl and
propyl are particular examples of “alkyl” in the compound of formula (I).
The term “alkoxy” or “alkyloxy”, alone or in combination, signifies a group of the
formula O- in which the term "alkyl" has the previously given significance, such as
methoxy, ethoxy, n-propoxy, isopropoxy, xy, isobutoxy, sec-butoxy and tert—
. A particular examples of “alkoxy” is methoxy.
The term “oxy”, alone or in combination, signifies the group.
The terms “halogen” or “halo”, alone or in combination, signifies e, chlorine,
bromine or iodine and particularly fluorine, chlorine or bromine, more particularly
fluorine. The term “halo”, in combination with another group, denotes the substitution of
said group with at least one halogen, particularly substituted with one to five halogens,
particularly one to four halogens, i.e. one, two, three or four halogens. Fluoro is a
particular halogen.
The term “carbonyl”, alone or in combination, es the -C(O)- group.
The term “pharmaceutically acceptable salts” refers to those salts which retain the
biological iveness and ties of the free bases or free acids, which are not
biologically or otherwise undesirable. The salts are formed with inorganic acids such as
hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, phosphoric acid,
particularly hydrochloric acid, and organic acids such as acetic acid, nic acid,
glycolic acid, pyruvic acid, oxalic acid, maleic acid, malonic acid, succinic acid, fumaric
acid, tartaric acid, citric acid, benzoic acid, ic acid, mandelic acid, methanesulfonic
acid, ethanesulfonic acid, enesulfonic acid, salicylic acid, ylcystein. In
addition these salts may be prepared form addition of an inorganic base or an organic base
to the free acid. Salts derived from an inorganic base include, but are not d to, the
sodium, potassium, lithium, ammonium, calcium, magnesium salts. Salts derived from
organic bases include, but are not limited to salts of primary, secondary, and ry
amines, substituted amines including naturally occurring substituted amines, cyclic amines
and basic ion exchange resins, such as isopropylamine, trimethylamine, diethylamine,
triethylamine, tripropylamine, ethanolamine, lysine, arginine, N—ethylpiperidine,
piperidine, polyamine resins. The compound of formula (I) can also be present in the form
of zwitterions. Particularly preferred pharmaceutically acceptable salts of nds of
formula (I) are the salts of hydrochloric acid, hydrobromic acid, ic acid, phosphoric
acid and methanesulfonic acid.
If one of the starting materials or compounds of formula (1) contain one or more
functional groups which are not stable or are reactive under the reaction conditions of one
or more reaction steps, appropriate protecting groups (as described e.g. in ctive
Groups in Organic Chemistry” by T. W. Greene and P. G. M. Wuts, 3rd Ed., 1999, Wiley,
New York) can be introduced before the critical step applying methods well known in the
art. Such protecting groups can be removed at a later stage of the synthesis using standard
methods described in the literature. Examples of protecting groups are tert-butoxycarbonyl
(Boc), 9-fluorenylmethyl carbamate (Fmoc), 2-trimethylsilylethyl carbamate (Teoc),
carbobenzyloxy (Cbz) and p-methoxybenzyloxycarbonyl (Moz).
The compound of formula (I) can contain several asymmetric centers and can be
present in the form of optically pure enantiomers, es of enantiomers such as, for
example, racemates, mixtures of diastereOfiisomers, diastereoisomeric racemates or
mixtures of diastereoisomeric racemates.
The term “asymmetric carbon atom” means a carbon atom with four different
substituents. According to the Cahn-Ingold—Prelog tion an asymmetric carbon atom
can be of the “R” or “S” configuration.
_ 7 _
The invention relates in particular to:
A compound according to the ion wherein R1 is methoxyazetidinyl,
difluoroazetidinyl or pyrrolidinyl.
A compound according to the invention wherein R2 and R3 are ndently
selected from hydrogen, ethyl and butyl.
A compound according to the invention wherein R2 and R3 are both ethyl at the same
time, or one of R2 and R3 is hydrogen and the other one is butyl.
A compound according to the invention n A1 is —CH-.
A compound according to the invention wherein X is fluorine; and
A compound according to the invention wherein n is 1, 2 or 3.
The invention further relates to a compound or formula (I) ed from:
fluoromethyl 2- {[6-(cyclopropylrnethoxy)-5—(3-rnethoxyazetidin- 1 —y1)pyridine
carbonyl]amino } ethylbutanoate;
Z-fluoroethyl 2— { [6-(cyclopropylmethoxy)—5 -(3-methoxyazetidin- l -y1)pyridine
carbony1]amino}—2-ethylbutanoate;
3-fluoropropy1 2- {[6-(cyclopropylmethoxy)-5 -(3-methoxyazetidinyl)pyridine
carbonyl]amino } ethylbutanoate;
fluoromethyl 2- {[6-(cyclopropylrnethoxy)-5 -(3 ,3 -difluoroazetidinyl)pyridine
carbonyl]amino } ylbutanoate;
2-fluoroethyl 2- { clopropylmethoxy)-5 -(3 ,3 roazetidin- l -yl)pyridine-2—
carbonyl]amino } —2-ethylbutanoate;
3-fluoropropyl 2- {[6-(cyclopropylmethoxy)-5 -(3 ,3 -difluoroazetidinyl)pyridine
carbonyl]amino } ethylbutanoate;
3—fluoropropy1 2— yclopropylmethoxy)-5 -(pyrrolidinyl)pyridine—2-
carbony1]amino}ethylbutanoate;
fluoromethyl 2— {[6-(cyclopropylmethoxy)-5 -(pyrrolidin- l -yl)pyridine
carbonyl]amino } ethylbutanoate;
W0 2020/002320
_ 8 _
2-fluoroethy1 2- { [6-(cyclopropylmethoxy)-5 -(pyrr01idin-1 -yl)pyridine
carbonyl]amino } ethy1butanoate;
fluoromethyl N-[6-(cyclopropylmethoxy)-5 -(3—methoxyazetidiny1)pyridine
y1]-L-leucinate;
2-fluoroethyl N—[6-(cyclopropy1methoxy)-5 -(3—rneth0xyazetidiny1)pyridine-2—
carbonyl]—L-leucinate;
0propyl N—[6-(cyclopropylmethoxy)-5 -(3—methoxyazetidin— 1 -yl)pyridine
carbonyl]—L-leucinate;
fluoromethyl N-[6-(cyclopropylmethoxy)(pyrr01idin-1 -y1)pyridine—2-carbony1]-L-
1 0 ate;
2-fluoroethyl cyclopr0py1methoxy)—5 -(pyrr01idiny1)pyridinecarbonyl]—L-
leucinate;
0propyl N—[6-(Cyclopropylmethoxy)-5 -(pyrrolidinyl)pyridine—2-carbony1] -
L-leucinate;
1 5 6-(cyc10propy1methoxy)-N—[(ZS)(fluoromethoxy)—4-methylpentany1]-5 -
(pyrrolidiny1)pyridinecarboxarnide;
6-(cyc10propy1methoxy)-N—[(2R)(2-fluoroethoxy)—4-rnethylpentan-Z-yl] -5 -
lidinyl)pyridinecarboxarnide;
6—(cyc10propy1methoxy)—N-[(ZS)(2-fluoroethoxy)methylpentan-2—y1]-5 -
(pyrrolidiny1)pyridinecarboxarnide;
6-(cyclopropylmethoxy)-N-[(ZS)(3-fluoropropoxy)—4-methylpentany1] -5 -
(pyrrolidiny1)pyridinecarboxarnide;
6-(cyc10propy1methoxy)-N—[(2S)(fluorornethoxy)—3-methy1butanyl]-5 -
(pyrrolidin—1-yl)pyridine—2-carboxamide;
6—(cyc10propy1methoxy)-N—[(ZS)(2-fluoroethoxy)-3—rnethylbutan-2—y1] -5 -
(pyrrolidiny1)pyridinecarboxarnide;
6-(cyc10propy1methoxy)—N—[(ZS)(3-fluoropropoxy)—3 -rnethylbutany1]
(pyrrolidiny1)pyridinecarboxarnide;
W0 2020/002320
_ 9 _
6-(cyclopropylmethoxy)-N—[(2S)(fluorornethoxy)propany1]-5 -(pyrrolidin
yl)pyridinecarboxamide;
6-(cyc10propy1methoxy)-N—[(ZS)(2-fluoroethoxy)propany1]-5 -(pyrrolidin
y1)pyridinecarboxamide;
6-(cyclopropylmethoxy)-N-[(ZS)(3-fluoropropoxy)propanyl] -5 -(pyrrolidin-1 -
idinecarboxamide;
6—(cyclopropylmethoxy)—N—[(ZS)—1-(fluorornethoxy)-4—methylpentan-2—yl]-5 -(3 —
yazetidiny1)pyridine—2-carb0xamide;
6-(cyclopropy1methoxy)(3,3-difluoroazetidiny1)-N-[(ZS)(2-fluoroethoxy)—4-
1 0 methy1pcntan-2—y1]pyridinecarb0xamide;
10pr0py1methoxy)-N—[(2R)(2-fluor0ethoxy)—4-methylpentany1] (3 -
methoxyazetidiny1)pyridinecarboxamide;
6—(cyclopropylmethoxy)—N—[(ZS)—1-(2-fluoroethoxy)-4—methylpentan-2—y1]-5 -(3 -
methoxyazetidiny1)pyridine—2-carboxamide;
1 5 6-(cyc10propy1methoxy)-N—[(ZS)(3-fluoropropoxy)—4-methylpentany1] (3 -
methoxyazetidiny1)pyridinecarb0xarnide;
6-(cyc10propy1methoxy)-N—[(2S)(fluorornethoxy)—3-methylbutanyl] -5 -(3-
methoxyazetidin- 1 ridinecarb0xamide;
6—(cyc10propy1meth0xy)-N—[(ZS)(2-fluoroethoxy)-3—methylbutan-2—y1]-5 -(3 —
methoxyazetidiny1)pyridine—2-carboxamide;
6-(cyc10pr0py1methoxy)-N—[(ZS)(3-fluoropr0poxy)—3-methylbutany1] (3 -
methoxyazetidiny1)pyridinecarboxarnide;
6-(cyc10propy1methoxy)-N—[(ZS)(2-fluoroethoxy)propany1]-5 -(3-
methoxyazetidin—1-y1)pyridine—2—carboxamide;
6—(cyc10propylmethoxy)—N-[(ZS)(3-fluoropropoxy)propan-2—yl] -5 -(3 -
methoxyazetidiny1)pyridine—2-carboxamide;
6-(cyc10propy1methoxy)—N— {3-[(fluoromethoxy)rnethyl]pentan-3 -y1} -5 -(pyrrolidin-
1-y1)pyridinecarboxamide;
6-(cyclopropylmethoxy)-N— {3-[(2-fluoroethoxy)methyl]pentan-3 -yl} -5 -(pyrrolidin-
1 ridinecarboxan1ide;
6-(cyclopropylrnethoxy)-N— {3 -[(3-fluoropropoxy)n1ethyl]pentan-3 -yl} -5 -
(pyrrolidin- l -yl)pyridine—2-carboxan1ide;
lopropylmethoxy)-N— uoromethoxy)n1ethyl]pentan-3 -yl} -5 -(3 -
methoxyazetidin- l -yl)pyridinecarboxamide;
6—(cyclopropylmethoxy)—N— {3-[(2—fluoroethoxy)methyl]pentan-3 -yl} -5 -(3 -
methoxyazetidin- l -yl)pyridine—2-carboxan1ide;
lopropylrnethoxy)-N— {3 -[(3-fluoropropoxy)n1ethyl]pentan-3 -yl} -5 -(3 -
1 0 methoxyazetidin— l -yl)pyridinecarboxan1ide;
fluoromethyl 2- {[6-(cyclopropyln1ethoxy)-5 -(3-n1ethoxyazetidin- l -yl)pyrazine
carbonyl] arnino } ethylbutanoate;
2—fluoroethyl 2- { [6-(cyclopropylmethoxy)—5 -(3—methoxyazetidinyl)pyrazine—2-
carbonyl]amino } ethylbutanoate;
1 5 3-fluoropropyl 2- {[6-(cyclopropylmethoxy)-5 —(3 -n1ethoxyazetidin- l -yl)pyrazine
carbonyl]amino } ethylbutanoate;
fluoro(dideuterio)n1ethyl 2- { [6-(cyclopropyln1ethoxy)-5 -(3 -n1ethoxyazetidin
yl)pyridinecarbonyl]amino} ethylbutanoate;
2—fluoro(2,2-dideuterio)ethyl 2— {[6-(cyclopropylrnethoxy)—5 -(3—rnethoxyazetidin- l -
yl)pyridinecarbonyl]amino } ethylbutanoate;
3-fluoro(3 ,3 -dideuterio)propyl 2- {[6-(cyclopropylrnethoxy)(3 oxyazetidin- l -
yl)pyridinecarbonyl]amino } —2-ethylbutanoate;
fluoro(dideuterio)n1ethyl 2- {[6—(cyclopropyln1ethoxy)—5 -(3 ,3 -difluoroazetidin- l -
yl)pyridinecarbonyl]amino} —2—ethylbutanoate;
2—fluoro(2,2-dideuterio)ethyl 2— { [6-(cyclopropyln1ethoxy)-5 -(3 ,3 -difluoroazetidin- l -
idinecarbonyl]amino } ethylbutanoate;
3-fluoro(3 ,3 -dideuterio)propyl 2- yclopropylmethoxy)(3 ,3 -difluoroazetidinyl)pyridinecarbonyl]amino} ethylbutanoate;
_ 11 _
3-fluor0(3 ,3 -dideuterio)propyl 2- {[6-(cyclopropylrnethoxy)(pyrrolidin
yl)pyridinecarbonyl]amino } ethy1butanoate;
fluoro(dideuterio)methyl 2- yclopropy1methoxy)-5 -(pyrrolidin- 1-y1)pyridine
carbonyl]amino } —2-ethy1butan0ate;
2-fluor0(2,2-dideuteri0)ethy1 2- { [6-(cyclopr0py1methoxy)-5 -(pyrr01idin-1 -
yl)pyridinecarbony1]amino} ethy1butanoate;
6—(cyclopropylmethoxy)—N-[(ZS) {[fluoro(dideuterio)methyl]oxy}
methylpentan-Z-yl]-5 -(pyrr01idin-1 -y1)pyridinecarboxarnide;
6-(cyc10propy1methoxy)-N—[(ZS) {[2-fluoro(2,2-dideuterio)ethy1]oxy}
1 0 methylpentan-Z—yl]—5 -(pyrr01idin-1 -y1)pyridine—2-carboxarnide;
6-(cyclopropylmethoxy)-N-[(ZS) {[3-fluor0(3 ,3-dideuterio)propyl]oxy}
methylpentan—Z—yl]—5 -(pyrrolidin-1 -y1)pyridinecarboxamide;
6—(cyc10propylmethoxy)—N—[(ZS) {[fluoro(dideuterio)methyl]oxy} methy1butan-
2-y1] -5 -(pyrr01idin-1 -y1)pyridinecarboxarnide;
1 5 6-(cyc10propy1methoxy)-N—[(ZS) {[2-fluoro(2,2-dideuterio)ethy1]oxy} -3 -
methylbutan-Z-yl] -5 -(pyrr01idin-1 -y1)pyridinecarb0xarnide;
6-(cyclopropylmethoxy)-N-[(2S)— 1 - {[3-fluoro(3 ,3 - dideuterio)propy1]oxy} -3 -
butan-Z-y1]-5 -(pyrrolidiny1)pyridinecarboxamide;
6—(cyc10propylmethoxy)—N—[(ZS) {[fluoro(dideuterio)methyl]oxy}propan-Z-y1]-5 -
(pyrrolidiny1)pyridinecarboxarnide;
6-(cyclopropylmethoxy)-N-[(ZS) {[2-fluoro(2,2-dideuterio)ethy1]oxy}propan-Z-
yl]—5 -(pyrr01idiny1)pyridinecarboxarnide;
6-(cyc10propy1methoxy)-N—[(2S)— 1 - {[3-fluoro(3 ,3 -dideuterio)propyl]oxy}propan-Z-
y1]—5 -(pyrrolidin—1-y1)pyridine-2—carboxamide;
10propylmethoxy)—N-[(ZS) {[fluoro(dideuterio)methy1]oxy}
methylpentan-Z—yl]—5-(3-methoxyazetidin-1 ridinecarboxarnide;
6-(cyc10propy1methoxy)—N—[(ZS) {[2-fluoro(2,2-dideuterio)ethy1]oxy}
pentan-Z—yl]—5-(3-rnethoxyazetidin-1 -y1)pyridinecarboxarnide;
WO 02320
_ 12 _
6-(cyclopropylmethoxy)-N—[(2S)- l - {[3-fluoro(3 ,3 -dideuterio)propyl]oxy}
methylpentan-Z-yl]—5 -(3-rneth0xyazetidin- l -yl)pyridinecarboxarnide;
lopropylmethoxy)-N—[(ZS)- l - {[fluoro(dideuterio)methyl]oxy} methylbutan-
2—yl] -5 -(3 -methoxyazetidin- l -yl)pyridinecarboxarnide;
6-(cyclopropylmethoxy)-N—[(ZS)- l - {[2—fluoro(2,2-dideuterio)ethyl]oxy} -3 -
methylbutan-Z-yl] (3-methoxyazetidin- l -yl)pyridinecarboxamide;
6—(cyclopropylmethoxy)—N—[(ZS)— l - {[3—fluoro(3 ,3 -dideuterio)propyl]oxy} -3 -
butan-Z-yl] (3—methoxyazetidin- l -yl)pyridinecarboxarnide;
6-(cyclopropylmethoxy)-N—[(ZS) {[2-fluoro(2,2-dideuterio)ethyl]oxy}propan-Z-
1 0 yl]-5 -(3—meth0xyazetidin- l -yl)pyridine—2-carboxarnide;
6-(cyclopropylmethoxy)-N—[(ZS)- l - or0(3 ,3 - dideuterio)propyl]oxy}propan-Z-
yl]-5 -(3-rnethoxyazetidin- l -yl)pyridinecarboxamide;
6—(cyclopropylmethoxy)—N—[3 -( { [fluoro(dideuterio)methyl]oxy}methyl)pentan—3 -
yl]-5 -(pyrrolidin- l -yl)pyridine—2-carb0xarnide;
1 5 6-(cyclopropylmethoxy)-N—[3 -( { [2-flu0ro(2,2-dideuterio)ethyl]oxy}methyl)pentan-
3-yl] -5 -(pyrrolidin-l -yl)pyridinecarboxarnide;
6-(cyclopropylmethoxy)-N—[3-({[3-fluoro(3,3-dideuterio)propyl]oxy}methyl)pentan-
3-yl](pyrrolidinyl)pyridinecarboxarnide;
6—(cyclopropylmethoxy)—N—[3 -( { (dideuterio)methyl]oxy}methyl)pentan—3 -
yl]-5 -(3-methoxyazetidin- l -yl)pyridinecarboxarnide;
6-(cyclopropylmethoxy)-N—[3 -( { [2-flu0ro(2,2-dideuterio)ethyl]oxy}methyl)pentanyl] -5 -(3 -rneth0xyazetidin- l -yl)pyridinecarboxamide;
6-(cyclopropylmethoxy)-N—[3-({[3-flu0ro(3,3-dideuterio)propyl]oxy}methyl)pentan-
3—yl](3 —methoxyazetidin—1-yl)pyridine—2-carboxamide;
ethyl 2- { [6-(cyclopropylmethoxy)—5 -(3—meth0xyazetidin- l -yl)pyridine—2-
carbonyl]amino} ethylflu0ro(4,4-dideuterio)butan0ate;
ethyl 2— { [6-(cyclopropylrnethoxy)—5 —(3-rnethoxyazetidin- l -yl)pyridine
carbonyl]amino} ethylflu0r0(4,4-dideuteri0)butanoate;
6-(cyclopropylmethoxy)-5 -(3 -fluoro-3 -rnethylazetidiny1)-N-(3 -(3 -
fluoropropylcarbanioyl)pentan-3 -yl)picolinan1ide;
ethyl 2- { [6-(cyclopropyln1ethoxy)—5 -(3-rnethoxyazetidin- l -yl)pyridine-2 -
yl] arnino } —2-ethyl—4-fluorobutanoate;
ethyl 2- { [6-(cyclopropyln1ethoxy)—5 -(3—n1ethoxyazetidin- l -yl)pyridine-2 -
carbonyl]amino } ylfluorobutanoate;
ethyl 2- { [6-(cyclopropylmethoxy)—5 -(3—methoxyazetidin— 1 -yl)pyridine—2—
carbonyl]amino} ethylfluorobutanoate; and
ethyl 2— { [6-(cyclopropylrnethoxy)—5 -(3-rnethoxyazetidin- l -yl)pyridine
carbonyl]an1ino} ethylfluorobutanoate.
The invention further relates to a compound according to the invention selected
from:
oethyl 2- { [6-(cyclopropylmethoxy)—5 -(3—methoxyazetidinyl)pyridine—2-
carbonyl]amino } ethylbutanoate;
1 5 opropyl 2- {[6-(cyclopropylmethoxy)-5 —(3 -n1ethoxyazetidin- l —yl)pyridine
carbonyl]amino } ethylbutanoate;
2-fluoroethyl N—[6-(cyclopropylmethoxy)—5 -(3-n1ethoxyazetidin- l -yl)pyridine
carbonyl]-L-leucinate;
2—fluoroethyl N—[6-(cyclopropylmethoxy)—5 olidin— l -yl)pyridine—2-carbonyl]-L-
leucinate;
6-(cyclopropylmethoxy)-N—[(ZS)(fluorornethoxy)—4-rnethylpentanyl]-5 -
(pyrrolidin- l -yl)pyridinecarboxan1ide;
6-(cyclopropylrnethoxy)-N—[(2S)(2-fluoroethoxy)n1ethylpentanyl]-5 -
(pyrrolidin—1-yl)pyridine—2-carboxamide;
6—(cyclopropylmethoxy)-N—[(ZS)(fluoromethoxy)—4—rnethylpentanyl] -5 -(3 -
methoxyazetidin- l -yl)pyridine—2-carboxamide;
6-(cyclopropylmethoxy)—5-(3,3-difluoroazetidinyl)-N-[(ZS)(2-fluoroethoxy)—4-
methylpentan-2—yl]pyridinecarboxan1ide; and
_ 14 _
6-(cyclopropylmethoxy)-N—[(2S)- l -(2-fluoroethoxy)methylpentanyl]-5 -(3 -
methoxyazetidin- l ridinecarboxamide.
The invention also relates in particular to 6-(cyclopropylmethoxy)—N—[(28)-l-(2-
fluoroethoxy)—4-methylpentan—2-yl] -5 —(pyrrolidin- l -yl)pyridinecarboxamide.
The synthesis of the compounds with the general structure I can, for example, be
accomplished according to the following schemes.
Following the procedure according to scheme 1, compound AA (R’ = H, methyl,
ethyl, isopropyl, tert. butyl or another suitable protecting group described for example in
T.W. Greene et al., Protective Groups in Organic Chemistry, John Wiley and Sons Inc.
New York 1999, 3rd edition) can be used as starting material. AA is either commercially
available, bed in the literature or can be synthesized by a person skilled in the art.
Schemel
,R' +
_. ’1 —. X ’Rv
AA AB AC
R"—H C
R2R3 AD
R" if "'
AZ'M002m "
‘ R
OH <—
Compound AB can be prepared from AA by oxidation with a suitable oxidizing
reagent under conditions known to a person d in the art (step a), e.g. by treatment
with 3-chloro perbenzoic acid in dichloromethane at ambient temperature.
sion of compound AB to 6-chloro or 6-bromo-picoline AC (X = Cl, Br) can
be ed e.g. by treatment with phosphoryl trichloride or mide either without an
additional solvent or in a suitable t such as chloroform at temperatures between 20
oC and the boiling point of the solvent, or by using other conditions known in the literature
(step b).
ro- or bromo-picoline AC (X = Cl, Br) can be ormed to compound AE
by reaction with a suitably substituted primary or ary alcohol AD such as
ropylmethanol in the presence of a base, for example sodium hydride, with or
without an inert solvent, for example dimethylformamide, at temperatures g from
room temperature to the reflux temperature of the solvent, particularly at room temperature
(step c).
The saponification of the ester of general formula AE (R’ 75 H) by methods well
known to the ones skilled in the art - using e.g. aqueous LiOH, NaOH or KOH in
ydrofuran / ethanol or another suitable solvent at temperatures between 0 oC and the
reflux temperature of the solvent employed - leads to an acid of l formula 11 (step
nd I (R’ ’ = cyclopropylmethyloxy) can be prepared from 11 and the
corresponding amine of formula III by suitable amide bond forming reactions (step e).
These reactions are known in the art. For example coupling reagents like N,N’-carbonyl-
diimidazole (CDI), N,N’-dicyclohexylcarbodiimide (DCC), 1-(3-dimethylaminopropyl)
ethylcarbodiimide hloride (EDCI), l-[bis(dimethylamino)-methylene]-1H—l,2,3-
triazolo[4,5-b]pyridinium—3-oxide hexafluorophosphate (HATU), l-hydroxy-l,2,3-
benzotriazole (HOBT), O-benzotriazoly1—N,N,N’,N’ -tetramethyluronium
tetrafluoroborate (TBTU), and O-benzotriazole-N,N,N’,N’-tetramethyl-uronium-
hexafluoro-phosphate (HBTU) can be employed to affect such transformation. A
convenient method is to use for example HBTU and a base, for example N-
methylmorpholine in an inert solvent such as for example dimethylformamide at room
temperature.
Alternatively, compound AC (R’ = methyl, ethyl, isopropyl, tert. butyl or another
suitable protecting group described for example in T.W. Greene et al., Protective Groups
in Organic try, John Wiley and Sons Inc. New York 1999, 3rd edition) can be: i)
converted into its acid congener AC (R’ = H) as described in step (1; ii) transformed into
the corresponding amide by treatment with amine III as described in step e; and iii)
reacted with alcohol AD as described in step c to arrive at compound I.
Amines III and alcohols AD are either commercially available, described in the
literature, can be sized by a person skilled in the art or as described in the
experimental part.
If one of the starting materials, compounds of ae AA, AD or III, contains one
or more functional groups which are not stable or are reactive under the reaction
conditions of one or more reaction steps, appropriate protecting groups (P) (as described
WO 02320
e.g. in T.W. Greene et al., Protective Groups in Organic Chemistry, John Wiley and Sons
Inc. New York 1999, 3rd edition) can be introduced before the al step applying
methods well known in the art. Such protecting groups can be removed at a later stage of
the synthesis using standard methods known in the art.
If one or more compounds of formulae AA to AE, AD, 11 or III contain chiral
centers, nes of formula I can be obtained as mixtures of diastereomers or
enantiomers, which can be separated by s well known in the art, e.g. (chiral) HPLC
or crystallization. Racemic compounds can e.g. be separated into their antipodes Via
diastereomeric salts by llization or by separation of the antipodes by specific
chromatographic methods using either a chiral adsorbent or a chiral eluent.
Following the procedure according to scheme 2, nd BA (R’ = H, methyl,
ethyl, isopropyl, tert. butyl or another suitable protecting group described for example in
T.W. Greene et al., Protective Groups in Organic Chemistry, John Wiley and Sons Inc.
New York 1999, 3rd edition) can be used as starting material. BA is either commercially
available (e.g. for R’ = methyl: 5-bromochloro-pyridinecarboxylic acid methyl ester
CAN 12143533), described in the literature or can be synthesized by a person skilled
in the art.
Scheme 2
R1—M
{ M0R' BB
, ("r
Br RMMOR
BA AC'
R"—H
AD R2
H2 AZ'OVCJgf RLM
R2 R2
"' BB
R" O’R' R" N>Z::2.o\/cpz R"
a fizwoozm
l X n X
c l H l H
/ / /
Br Br
BC BD I
Compound AC’ can be prepared from BA by coupling with an amine BB (M is H)
by methods well known to a person d in the art, e.g. using a palladium catalyst such
as tris(dibenzylideneacetone)dipalladium/ dimethylbisdiphenyl-phosphinoxanthene and a
base such as cesium carbonate in a solvent such as l,4-dioxane, preferentially at the
boiling point of the solvent (step a).
Compound AC’ can be further elaborated to compound I (R” =
ropylmethyloxy) by: i) reaction with compound AD to form compound AE as
described in step c of scheme 1; ii) saponification as described in step d of scheme 1; and
iii) amide bond ion as described in step e of scheme 1.
Furthermore, compound BA can be converted into compound BC by treatment with
compound AD as bed in step c of scheme 1 (step b).
uent transformation of compound BC into compound AE can be achieved as
discussed for the conversion of BA into AC’ (step a).
nd AE can be further ated to compound I (R” =
cyclopropylmethyloxy) by: i) saponiflcation as described in step d of scheme 1; ii) amide
bond formation as described in step e of scheme 1.
Alternatively, compound BC (R’ = methyl, ethyl, isopropyl, tert. butyl or another
le protecting group described for example in T.W. Greene et al., Protective Groups
in Organic Chemistry, John Wiley and Sons Inc. New York 1999, 3rd edition) can be: i)
converted into its acid congener BC (R’ = H) as described in step d of scheme 1; ii)
transformed into the corresponding amide BD by treatment with amine III as described in
step e of scheme 1; and iii) reacted with BB as described in step a to arrive at compound I
(R’ ’ = cyclopropylmethyloxy).
Furthermore, compound I can also be synthesized applying the ing reaction
sequence: i) saponification of compound BA (R’ = methyl, ethyl, isopropyl, tert. butyl or
another suitable protecting group described for example in T.W. Greene et al., Protective
Groups in Organic Chemistry, John Wiley and Sons Inc. New York 1999, 3rd edition) to its
acid congener BA (R’ = H) as described in step d of scheme 1; ii) conversion to the
corresponding amide by treatment with amine III as described in step e of scheme 1; iii)
on with compound BB as described in step a; and iv) reaction with compound AD as
described in step b. Optionally step iii) and step iv) can be interchanged.
If one of the starting materials, compounds of ae CA, CB or BC contains one
or more functional groups which are not stable or are ve under the reaction
conditions of one or more reaction steps, appropriate protecting groups (P) (as described
e.g. in T.W. Greene et al., Protective Groups in Organic Chemistry, John Wiley and Sons
Inc. New York 1999, 3rd edition) can be uced before the critical step applying
methods well known in the art. Such protecting groups can be d at a later stage of
the synthesis using standard methods known in the art.
If one or more compounds of formulae BA, BB or AD contain chiral centers,
picolines of formula AC’ and AE can be ed as mixtures of diastereomers or
enantiomers, which can be ted by methods well known in the art, e.g. (chiral) HPLC
or crystallization. Racemic compounds can e.g. be separated into their antipodes via
diastereomeric salts by crystallization or by separation of the antipodes by specific
chromatographic s using either a chiral adsorbent or a chiral eluent.
The invention also relates to a process for the preparation of a compound of a
(1) comprising one of the following steps:
(a) the reaction of a compound of formula (A)
koleLN Abowcozymx H
Y A1
in the presence of Rl-H, a palladium catalyst and a base;
(b) the reaction of a compound of formula (B)
”II 1’
R A (B)
in the presence ofNH2-C(R2R3)—A2-O-(CH2)n-(CD2)m-X, a coupling agent and a
base;
wherein A1, A2, X, Rl-R3, m and n are as defined above and Y is halogen.
The coupling agent of step (b) is conveniently an amide bond forming agent, like
e.g. N,N’-carbonyl-diimidazole (CD1), N,N’-dicyclohexylcarbodiimide (DCC), 1-(3-
dimethylaminopropyl)—3-ethylcarbodiimide hydrochloride (EDCI), 1—[bis(dimethylamino)-
methylene]—IH-l,2,3-triazolo[4,5-b]pyridinium—3-oxide hexafluorophosphate (HATU), 1-
y- l ,2,3—benzotriazole , O-benzotriazol— l -yl-N,N,N’,N’-tetramethyluronium
tetrafluoroborate (TBTU) or and otriazole-N,N,N’,N ’-tetramethyl-uronium—
hexafluoro-phosphate (HBTU).
N-methylmorpholine is a convenient base for step (b).
HBTU can ageously be used in combination with N—methylmorpholine in step
(b).
The solvent of step (b) can advantageously be ylformamide.
In step (a), the palladium catalyst can be for example
tris(dibenzylideneacetone)dipalladium / dimethylbisdiphenyl-phosphinoxanthene.
In step (a) the base can be e.g. cesium carbonate.
In step (a), the solvent is advantageously 1,4-dioxane.
In step (a), Y can conveniently be e.
The ion also relates to a compound according to the invention when
manufactured according to a process of the invention.
Another embodiment of the invention provides a pharmaceutical composition or
medicament containing a nd of the invention and a therapeutically inert carrier,
diluent or excipient, as well as a method of using the compounds of the invention to
prepare such composition and medicament. In one example, the compound of formula (I)
may be ated by mixing at ambient temperature at the appropriate pH, and at the
desired degree of purity, with physiologically acceptable carriers, i.e., carriers that are
non-toxic to recipients at the dosages and concentrations employed into a galenical
administration form. The pH of the formulation depends mainly on the particular use and
the concentration of nd, but preferably ranges anywhere from about 3 to about 8.
In one example, a compound of formula (I) is formulated in an acetate buffer, at pH 5. In
another embodiment, the nd of formula (I) is sterile. The compound may be stored,
for example, as a solid or amorphous composition, as a lized formulation or as an
aqueous solution.
Compositions are formulated, dosed, and administered in a fashion consistent with
good medical practice. Factors for consideration in this context e the particular
disorder being treated, the ular mammal being treated, the clinical ion of the
individual patient, the cause of the disorder, the site of delivery of the agent, the method of
administration, the scheduling of administration, and other factors known to medical
tioners.
The compounds of the invention may be administered by any suitable means,
including oral, topical (including buccal and sublingual), rectal, vaginal, transdermal,
parenteral, subcutaneous, intraperitoneal, intrapulmonary, intradermal, intrathecal and
epidural and intranasal, and, if desired for local treatment, intralesional administration.
Parenteral infusions include intramuscular, intravenous, intraarterial, intraperitoneal, or
subcutaneous administration.
The compounds of the present invention may be administered in any convenient
administrative form, e. g., tablets, powders, capsules, solutions, dispersions, suspensions,
syrups, sprays, itories, gels, emulsions, patches, etc. Such compositions may
contain components conventional in pharmaceutical ations, e.g., diluents, carriers,
pH modifiers, sweeteners, bulking agents, and further active agents.
A typical formulation is prepared by mixing a compound of the t ion
and a r or excipient. Suitable carriers and excipients are well known to those skilled
in the art and are described in detail in, e. g., Ansel, Howard C., et al., Ansel’s
Pharmaceutical Dosage Forms and Drug Delivery Systems. Philadelphia: Lippincott,
Williams & Wilkins, 2004; Gennaro, Alfonso R., et a1. Remington: The Science and
ce of Pharmacy. Philadelphia: Lippincott, Williams & Wilkins, 2000; and Rowe,
d C. Handbook of Pharmaceutical Excipients. Chicago, Pharmaceutical Press,
2005. The formulations may also include one or more buffers, stabilizing agents,
surfactants, wetting agents, ating agents, emulsifiers, suspending agents,
preservatives, antioxidants, opaquing agents, glidants, processing aids, colorants,
sweeteners, perfuming agents, flavoring agents, diluents and other known additives to
provide an elegant presentation of the drug (i.e., a compound of the t invention or
pharmaceutical ition thereof) or aid in the cturing of the pharmaceutical
product (i.e., ment).
The invention also relates in particular to:
The use of a compound of formula (I) for the treatment or prophylaxis of pain,
atherosclerosis, age-related macular degeneration, diabetic retinopathy, glaucoma, diabetes
mellitus, inflammation, inflammatory bowel disease, ischemia-reperfusion injury, acute
liver failure, liver fibrosis, lung fibrosis, kidney fibrosis, systemic fibrosis, acute allograft
rejection, chronic allograft pathy, ic nephropathy, ulonephropathy,
cardiomyopathy, heart e, myocardial ischemia, myocardial infarction, systemic
sclerosis, l injury, burning, hypertrophic scars, keloids, gingivitis pyrexia, liver
cirrhosis or tumors, regulation of bone mass, neurodegeneration, stroke, transient ischemic
attack or uveitis;
The use of a nd ing of formula (I) for the preparation of a medicament
for the treatment or prophylaxis of pain, atherosclerosis, age-related macular degeneration,
diabetic retinopathy, glaucoma, diabetes mellitus, inflammation, inflammatory bowel
disease, ischemia-reperfusion , acute liver failure, liver fibrosis, lung fibrosis, kidney
fibrosis, systemic fibrosis, acute allograft rejection, chronic allograft nephropathy, ic
nephropathy, glomerulonephropathy, cardiomyopathy, heart failure, myocardial ischemia,
myocardial infarction, systemic sclerosis, thermal injury, burning, hypertrophic scars,
keloids, gingivitis pyrexia, liver cirrhosis or tumors, tion of bone mass,
neurodegeneration, stroke, transient ischemic attack or uveitis,
A compound of a (I) for use in the treatment or laxis of pain,
atherosclerosis, age-related macular degeneration, diabetic pathy, glaucoma, diabetes
mellitus, inflammation, inflammatory bowel disease, ia-reperfusion injury, acute
liver failure, liver fibrosis, lung fibrosis, kidney fibrosis, systemic fibrosis, acute allograft
rejection, chronic allograft nephropathy, diabetic nephropathy, glomerulonephropathy,
cardiomyopathy, heart failure, myocardial ischemia, myocardial infarction, systemic
sis, thermal injury, burning, hypertrophic scars, keloids, gingivitis pyrexia, liver
cirrhosis or tumors, tion of bone mass, neurodegeneration, stroke, transient ischemic
attack or uveitis, and
A method for the treatment or prophylaxis of pain, atherosclerosis, age-related
macular degeneration, ic retinopathy, glaucoma, diabetes mellitus, inflammation,
inflammatory bowel disease, ischemia-reperfusion injury, acute liver failure, liver fibrosis,
lung s, kidney s, systemic fibrosis, acute allograft ion, chronic allograft
nephropathy, diabetic nephropathy, ulonephropathy, cardiomyopathy, heart failure,
myocardial ischemia, myocardial infarction, systemic sclerosis, thermal injury, burning,
hypertrophic scars, s, gingivitis pyrexia, liver cirrhosis or tumors, regulation of bone
mass, neurodegeneration, stroke, transient ischemic attack or uveitis, which method
comprises administering an ive amount of a compound of formula (I) to a patient in
need thereof.
The invention particularly relates to a compound of formula (I) for the treatment or
prophylaxis of ischemia, reperfusion , liver fibrosis or kidney fibrosis, in particular
ischemia or reperfusion .
The invention will now be illustrated by the following examples which have no
limiting character.
2019/066811
_ 22 _
Examples
Abbreviations
CAN = chemical cts service number; DIPEA = N-ethyl-N—isopropylpropanamine;
DMF = dimethylformamide; EtOAc = ethyl acetate; hept. = heptane; HPLC = LC = high
mance liquid chromatography; ISP = ion spray, corresponds to ESI (electrospray);
MS = mass spectrometry; NMR data are reported in parts per million (8) relative to
internal tetramethylsilane and are referenced to the deuterium lock signal from the sample
solvent (ds-DMSO unless ise ); coupling constants (J) are in Hertz; RT =
room temperature; TBTU = O-(benzotriazol-l -yl)-N,N,N’,N’-tetramethyl-uronium—
tetrafluoroborate; THF = tetrahydrofuran; tlc = thin layer chromatography.
Example 1
Fluoromethyl 2-{[6-(cyclopr0pylmethoxy)—5-(3-meth0xyazetidinyl)pyridine
carbonyl] amin0}ethylbutan0ate
a) 2-(6-(Cyclopropylmethoxy)-5 -(3-methoxyazetidin- l -yl)picolinamido)—2-ethylbutanoic
acid
In a 25 mL round-bottomed flask, ethyl 2-(6—(cyclopropylmethoxy)(3-methoxyazetidin-
1-yl)picolinamido)—2-ethylbutanoate (CAN 1778678—14-0, 210 mg, 501 umol, Eq: 1) was
combined with THF (3 mL) and MeOH (3.3 mL) to give a colorless solution. KOH (140
mg, 2.5 mmol, Eq: 5), dissolved in water (3 mL) was added and the reaction e was
stirred at 100 0C for 19 h. KOH (75 mg) and 1 mL THF, MeOH and water were added and
stirring was continued at 100 °C for 3 h. The organic solvent was removed under reduced
pressure and the aqueous phase was acidified (l N HCl). The resulting white suspension
was extracted with EtOAc (3 x 25 mL). The combined c layers were washed with
brine (l x 20 mL), dried over NazSO4 and concentrated in vacuo to give the crude title
compound as light brown oil which was used in the next step without further purification,
MS (ISP): 392.314 [MH+].
b) methyl 2- { [6—(cyclopropylmethoxy)—5 -(3-methoxyazetidin—l -yl)pyridine-2—
carbonyl]amino} ethylbutanoate
In a 10 mL round-bottomed flask, 2—(6-(cyclopropylmethoxy)—5-(3 —methoxyazetidin-l-
yl)picolinamido)ethylbutanoic acid (37 mg, 94.5 umol, Eq: 1) was combined with DMF
(500 uL) to give a light brown solution. K2C03 (65.3 mg, 473 umol, Eq: 5) and fluoro-
iodo-methane (76.3 mg, 32.2 uL, 473 umol, Eq: 5) were added. The reaction mixture was
stirred at RT for 30 min, diluted with EtOAc and washed with sat. NaCl (3 x 10 mL). The
organic layer was dried over Na2S04 and concentrated in vacuo. The crude t was
purified by column chromatography (SiOz, 5 g, hept./ EtOAc) to give the title compound
(27 mg, 68%) as ess oil, MS (ISP): 424.341 [MH+].
Example 2
2-Flu0r0ethy] 2-{[6-(cyclopr0pylmeth0xy)(3-meth0xyazetidinyl)pyridine
yl] amin0}ethylbutan0ate
In analogy to the procedure described in example 1 b, 2-(6-(cyclopropylmethoxy)—5—(3-
methoxyazetidin-l-yl)picolinamido)ethylbutanoic acid (example 1 a) was d with
fluoro-iodo-methane to give the title compound as colorless oil, MS (ISP): 438.346 [MH+].
Example 3
3-Flu0r0pr0pyl 2-{[6-(cyclopropylmeth0xy)—5-(3-meth0xyazetidinyl)pyridine—2-
carbonyl] amin0}ethylbutanoate
W0 2020l002320 2019/066811
l/ Hog—L
In analogy to the procedure described in example 1 b, cyclopropylmethoxy)-5—(3-
methoxyazetidin-l-yl)picolinamido)ethylbutanoic acid (example 1 a) was reacted with
l-iodo—3-fluoropropane to give the title compound as colorless oil, MS (ISP): 452.4
[MH+].
Example 4
Fluoromethyl 2-{[6-(cyclopropylmethoxy)—5-(3,3-diflu0r0azetidinyl)pyridine—2-
carbonyl] amino}ethylbutanoate
Whig
In analogy to the procedure described in example 1 b, cyclopropylmethoxy)(3,3-
difluoroazetidin-l-yl)picolinamido)-2—ethylbutanoic acid (CAN 1415896-50—2) was
reacted with fluoro-iodo-methane to give the title compound as colorless oil, LC-MS (UV
peak area/ESI) 100%, 430.1952 [MH+].
Example 5
2-Flu0r0ethyl 2-{[6-(cyclopropylmethoxy)—5-(3,3-diflu0roazetidinyl)pyridine—2-
carbonyl] amino}ethylbutanoate
| NiiH
/ 0 ({fi
W0 2020l002320
In analogy to the procedure described in example 1 b, 2-(6-(cyclopropylmethoxy)(3,3-
difluoroazetidin-l-yl)picolinamido)—2-ethylbutanoic acid (CAN 62) was
reacted with fluoro-iodo-ethane to give the title compound as colorless oil, LC-MS (UV
peak area/ESI) 100%, 444.2109 [MH+].
Example 6
3-Flu0r0pr0pyl 2-{[6-(cyclopropylmethoxy)(3,3-difluor0azetidinyl)pyridine
carbonyl] amin0}ethylbutan0ate
“315%l/ HoR
In analogy to the procedure bed in example 1 b, 2-(6-(cyclopropylmethoxy)-5—(3,3-
difluoroazetidin-l-yl)picolinamido)—2-ethylbutanoic acid (CAN 14158962) was
reacted with 1—iodo-3—fluoropropane to give the title compound as colorless oil, LC—MS
(UV peak area/ESI) 100%, 458.2263 [MH+].
Example 7
3-Flu0r0pr0py1 2-{ clopropy]meth0xy)—5-(pyrrolidinyl)pyridine—2-
carbonyl] amin0}ethylbutan0ate
fiififiéia
In analogy to the procedure described in example 1 b, 2-(6-(cyclopropylmethoxy)
(pyrrolidin-l-yl)picolinamido)—2-ethylbutanoic acid (CAN 1415897—34-5) was reacted
with l-iodofluoropropane to give the title compound as colorless oil, LC-MS (UV peak
area/ESI) 98%, 4362615 [MH+].
Example 8
methyl 2-{[6-(cyclopropylmethoxy)—5-(pyrrolidin-l-yl)pyridine
carbonyl] amino}ethylbutan0ate
2:19th
In analogy to the procedure described in example 1 b, 2-(6-(cyclopropylmethoxy)
(pyrrolidin-l-yl)picolinamido)—2-ethylbutanoic acid (CAN 1415897—34-5) was reacted
with iodo-methane to give the title compound as colorless oil, LC-MS (UV peak
SI) 96%, 408.2301 [MH+].
Example 9
2-Flu0r0ethyl 2-{[6-(cyclopr0pylmeth0xy)(pyrrolidin-l-yl)pyridine—2-
carbonyl] amino}ethylbutan0ate
“OVER
In analogy to the procedure described in example 1 b, 2-(6-(cyclopropylmethoxy)
(pyrrolidinyl)picolinamido)ethylbutanoic acid (CAN 14158975) was reacted
with fluoro-iodo-ethane to give the title compound as colorless oil, LC-MS (UV peak
area/ESI) 97%, 422.2463 [MH+].
Example 10
Fluoromethyl N- [6-(cyclopr0pylmeth0xy)—5-(3-meth0xyazetidinyl)pyridine—2-
yl]-L-leucinate
a) (S)—Methyl 2-(5-bromo(cyclopropylmethoxy)picolinamido)—4-methylpentanoate
k 0\
I H
/ O
In a 100 mL round-bottomed flask, 5-bromo(cyclopropylmethoxy)picolinic acid (CAN
14158981, 850 mg, 3.12 mmol, Eq: 1) was combined with DMF (15 mL) to give a
light yellow solution. TBTU (1.1 g, 3.44 mrnol, Eq: 1.1), DIPEA (1.61 g, 2.18 mL, 12.5
mmol, Eq: 4) and L-leucine methyl ester hydrochloride (CAN 75173, 794 mg, 4.37
mmol, Eq: 1.4) were added and the mixture was stirred at RT for 30 min. The t was
removed under reduced pressure and the residue dissolved in EtOAc. The organic layers
were combined, washed with sat. NaHC03 (3 x 20 mL), 1 M HCl (3 x 20 mL), and sat.
NaCl (3 x 20 mL). The c layers were dried over Na2S04 and concentrated in vacuo
to obtain crude title product (1.1 g, 88%) as light brown oil which was used in the next
reaction step without further purificaition, MS (ISP): 399.162 [MH+].
b) (S)-Methyl 2-(6-(cyclopropylmethoxy)-5 thoxyazetidinyl)picolinamido)—4-
methylpentanoate
In a 20 mL sealed tube, (S)-methyl 2—(5-bromo(cyclopropylmethoxy)picolinamido)
methylpentanoate (385 mg, 964 umol, Eq: 1) was combined with toluene (10 mL) to give
a colorless solution. 3-Methoxyazetidine hydrochloride (CAN 1486441, 179 mg, 1.45
mrnol, Eq: 1.5) and CszCOs (943 mg, 2.89 mmol, Eq: 3) were added. rac-2,2'—
Bis(diphenylphosphino)—1,1'—binaphthyl (120 mg, 193 umol, Eq: 0.2) and palladium(II)
e (43.3 mg, 193 umol, Eq: 0.2) were added. The white suspension was heated to 110
0C for 1 h, d with EtOAc and filtered through celite. The organic layers were
combined, washed with 1 M HCl (3 x 50 mL) and sat. NaCl (1 x 100 mL). The organic
layers were dried over Na2S04 and concentrated in vacuo. The crude product was purified
by column tography (SiOz, 50 g, hept./EtOAc) to give the title compound (287 mg,
73%) as light yellow oil, MS (ISP): 406.319 [MH+].
c) (S)—2-(6-(Cyclopropylmethoxy)-5 -(3-methoxyazetidinyl)picolinamido)
methylpentanoic acid
In a 25 mL round-bottomed flask, (S)-methyl 2-(6-(cyclopropylmethoxy)(3-
yazetidin-l-yl)picolinamido)methylpentanoate (270 mg, 666 umol, Eq: 1) was
combined with THF (2 mL), water (2 mL) and MeOH (2 mL) to give a light yellow
solution. KOH (l 12 mg, 2 mmol, Eq: 3) was added and the mixture was stirred for l h at
RT. The organic solvent was removed under reduced pressure. The aqueous phase was
ed to pH 2 with l M HCl and extracted with EtOAc (3 x 20 mL) and brine (l x 25
mL). The organic layers were dried over NazSO4 and concentrated in vacuo to give crude
title compound (quant) as light brown oil which was used in the next reaction step without
further purification, MS (ISP): 392.316 [MH+].
d) Fluoromethyl N—[6—(cyclopropylmethoxy)—5-(3-methoxyazetidin-l —yl)pyridine-2—
yl]-L-leucinate
In analogy to the procedure described in example 1 b, (S)-2—(6-(cyclopropylmethoxy)
(3 -methoxyazetidin- l colinamido)—4-methylpentanoic acid was reacted with fluoro-
iodo-methane to give the title compound as ess oil, MS (ISP): 424.289 [MH+].
Example 11
2-Flu0r0ethyl N-[6-(cyclopr0pylmethoxy)(3-methoxyazetidinyl)pyridine—2-
carbonyl]-L-leucinate
wwfifikfli
W0 2020l002320
In analogy to the procedure described in example 1 b, (S)(6-(cyclopropylmethoxy)
(3-methoxyazetidinyl)picolinamido)methylpentanoic acid (example 10 c) was
reacted with fluoro-iodo-ethane to give the title compound as colorless oil, MS (ISP):
438.294 [MH+].
Example 12
3-Flu0r0pr0pyl N-[6-(cyclopropylmethoxy)(3-methoxyazetidinyl)pyridine—2-
carbonyl]-L-leucinate
In analogy to the procedure described in example 1 b, (6-(cyclopropy1methoxy)
(3 -methoxyazetidin-1—yl)picolinamido)methylpentanoic acid (example 10 c) was
reacted with 1-fluoroiodopropane to give the title compound as colorless oil, MS (ISP):
452.351 [MH+].
Example 13
Fluoromethyl N-[6-(cyclopropylmethoxy)—5-(pyrrolidinyl)pyridine-2—carb0nyl]-L-
leucinate
a) thyl 2-(6-(cyclopropylmethoxy)—5-(pyrrolidinyl)picolinamido)
methylpentanoate
In analogy to the ure described in example 10 b, (S)-methyl 2-(5-bromo
(cyclopropylmethoxy)picolinamido)-4—methylpentanoate (example 10 a) was reacted with
pyrrolidine to give the title compound as light yellow oil, LC-MS (UV peak area/ESI)
95%, 390.2403 [MH+].
b) (S)(6-(Cyclopropylmethoxy)-5 -(pyrrolidin- l -y1)picolinamido)—4-methy1pentanoic
acid
ACMQOH
In analogy to the procedure described in example 10 c, thyl 2-(6-
(cyclopropylmethoxy)—5-(pyrrolidin- l —y1)picolinamido)methylpentanoate was
hydrolyzed with KOH to give the title compound as brown oil which was used in the next
reaction step without r purification, MS (ISP): 376.307 [MH+].
c) Fluoromethyl N—[6—(cyclopropylmethoxy)—5 -(pyrrolidin- l —yl)pyridinecarbony1]-L-
leucinate
In y to the procedure described in example 1 b, (S)(6-(cyclopropylmethoxy)
(pyrrolidin-l-yl)picolinamido)methylpentanoic acid was reacted with fluoro-iodo-
methane to give the title compound as light yellow oil, MS (ISP): 408.276 [MH+].
e 14
2-Flu0r0ethyl N-[6-(cyclopr0pylmethoxy)(pyrrolidinyl)pyridine-2—carb0nyl]-L-
leucinate
W0 2020l002320
2> 0%“
In y to the procedure described in example 1 b, (S)(6-(cyclopropylmethoxy)
(pyrrolidin-l -yl)picolinamido)—4-methylpentanoic acid (example 13 b) was reacted with
iodo-ethane to give the title compound as light brown oil, MS (ISP): 422.332
[MH+].
Example 15
3-Flu0r0pr0pyl N-[6-(cyclopr0pylmethoxy)(pyrrolidinyl)pyridine—2-carbonyl]-
L-leucinate
l/ H
In analogy to the procedure described in e 1 b, (S)-2—(6-(cyclopropylmethoxy)
(pyrrolidin-l -y1)picolinamido)methylpentanoic acid (example 13 b) was reacted With l-
fluoroiodopropane to give the title compound as light brown oil, MS (ISP): 436.338
[MH+].
Example 16
6-(Cyclopr0pylmethoxy)—N-[(ZS)(fluoromethoxy)methylpentan-Z-yl]
(pyrrolidinyl)pyridine—2-carboxamide
W0 2020l002320
In a 5 mL round-bottomed flask, (S)(cyclopropylmethoxy)-N-(1-hydroxy
methylpentanyl)(pyrrolidiny1)picolinamide (CAN 14158941, 40 mg, 11 1
umol, Eq: 1) was combined with DMF (1 mL) to give a ess solution which was
cooled to 0 oC. Sodium hydride on mineral oil (22.1 mg, 553 umol, Eq: 5) was added and
stirring was continued for 30 min. Fluoro-iodo-methane (88.5 mg, 37.3 uL, 553 umol, Eq:
) was added, the e was allowed to warm to ambient temperature and ng was
continued for l h. The reaction mixture was diluted with EtOAc. The organic layers were
combined and washed with sat. NaCl (3 x 25 mL). The c layers were dried over
Na2SO4 and concentrated in vacuo. The crude product was purified by column
tography (SiOz, 5 g, hept./EtOAc) to give the title compound (24 mg, 55%) as
white solid, MS (ISP): 394.271 [MH+].
Example 17
6-(Cyclopr0pylmethoxy)-N-[(ZS)(2-fluoroethoxy)methylpentan-Z-yl]
(pyrrolidinyl)pyridinecarb0xamide
In analogy to the procedure described in example 16, (S)(cyclopropylmethoxy)—N-(1-
hydroxymethy1pentanyl)(pyrrolidiny1)picolinamide (CAN 14158941) was
reacted with 1-fluoroiodoethane to give the title compound as colorless oil, MS (ISP):
408.327 [MH+].
Example 18
6-(Cyclopropylmethoxy)—N-[(ZS)(3-fluoropropoxy)—4-methylpentan-Z-yl]
(pyrrolidinyl)pyridine—2-carboxamide
2019/066811
In analogy to the procedure described in example 16, (S)(cyclopropylmethoxy)-N-(1-
hydroxymethylpentanyl)(pyrrolidinyl)picolinamide (CAN 41) was
reacted with 1-fluorofluoropropane to give the title compound as colorless oil, MS
(ISP): 422.332 [MH+].
Example 19
6-(Cylopr0pylmethoxy)—N- [(28)(fluor0methoxy)—3-methylbutanyl]
(pyrrolidinyl)pyridine—2-carb0xamide
a) (S)(Cyclopropylmethoxy)—N-(1-hydroxymethylbutanyl)—5 -(pyrrolidin
olinamide
In a 50 mL round-bottomed flask, 6-(cyclopropylmethoxy)(pyrrolidinyl)picolinic
acid (CAN 14158981, 295 mg, 1.12 mmol, Eq: 1) was combined with DMF (15 mL)
to give a yellow solution. DIPEA (727 mg, 982 uL, 5.62 mmol, Eq: 5) and TBTU (397
mg, 1.24 mmol, Eq: 1.1) were added. L-Valinol (CAN 20264, 174 mg, 1.69 mmol, Eq:
1.5) was added and the e was stirred at ambient temperature for 1 h. EtOAc was
added and the solution was washed with sat. NaHCO3 (3 X 20 mL), 1 M HCl (3 x 20 mL),
and sat. NaCl (3 x 20 mL). The organic layer was dried over NazSO4 and concentrated in
vacuo to give the title compound (240 mg, 61%) as light yellow oil which was used in the
next step t further purification, MS (ISP): 348.239 [MH+].
b) 6-(Cylopropylmethoxy)—N-[(2S)— 1-(fluoromethoxy)methylbutanyl]—5 -(pyrrolidin-
1-yl)pyridinecarboxamide
In analogy to the procedure described in example 16, (S)(cyclopropylmethoxy)—N-(1-
hydroxymethylbutanyl)—5-(pyrrolidinyl)picolinamide was reacted with fluoro-
iodo-methane to give the title compound as colorless oil, MS (ISP): 380.265 [MH+].
W0 2020l002320
Example 20
6-(Cyclopropylmethoxy)—N-[(ZS)(2-flu0roethoxy)—3-methylbutanyl]
(pyrrolidinyl)pyridine—2-carb0xamide
kmji
In analogy to the procedure described in example 16, (S)(cyclopropylmethoxy)-N-(l-
hydroxymethylbutanyl)—5-(pyrrolidinyl)picolinamide (example 19 a) was reacted
with 1-fluoroiodoethane to give the title compound as colorless oil, MS (ISP): 394.326
[MH+].
Example 21
lopr0pylmethoxy)—N-[(ZS)(3-fluor0prop0xy)—3-methylbutanyl]
(pyrrolidinyl)pyridine—2-carb0xamide
In y to the procedure bed in example 16, (S)(cyclopropylmethoxy)-N-(1-
hydroxymethylbutanyl)—5-(pyrrolidin-1—yl)picolinamide (example 19 a) was reacted
with 1-iodofluoropropane to give the title compound as colorless oil, MS (ISP):
408.391 [MH+].
Example 22
6-(Cyclopr0pylmethoxy)—N-[(ZS)(fluoromethoxy)propanyl](pyrrolidin
yl)pyridinecarb0xamide
a) (S)(Cyclopropylmethoxy)-N-( l -hydroxypropany1)—5-(pyrrolidin
yl)picolinamide
2%Km.
In analogy to the procedure described in example 19 a, 6-(cyclopropylmethoxy)—5-
lidin-l-yl)picolinic acid (CAN 14158981) was reacted with L-alaninol (CAN
2749—11-3) to give the title compound as light yellow oil, MS (ISP): 320.209 [MH+].
b) 6-(Cyclopropylmethoxy)-N—[(2S)— l —(fluoromethoxy)propany1]—5 -(pyrrolidin- l —
idine-2—carboxamide
In analogy to the procedure described in example 16, (cyclopropylmethoxy)—N-(l-
hydroxypropanyl)(pyrrolidin-l—yl)picolinamide was reacted With fluoro-iodo-
methane to give the title compound as colorless oil, MS (ISP): 352.204 [MH+].
e 23
6-(Cyclopr0pylmethoxy)—N-[(ZS)-l-(2-flu0r0ethoxy)propany]](pyrrolidin
yl)pyridine-2—carb0xamide
In analogy to the procedure described in example 16, (S)(cyclopropylmethoxy)-N—(l-
hydroxypropanyl)—5-(pyrrolidin-l-yl)picolinamide (example 22 a) was reacted with l-
fluoroiodoethane to give the title compound as colorless oil, MS (ISP): 366.298 [MH+].
e 24
6-(Cyclopropylmethoxy)—N-[(2S)—1-(3-fluoropropoxy)propanyl] (pyrrolidin
yl)pyridinecarb0xamide
In analogy to the procedure bed in example 16, (S)(cyclopropylmethoxy)-N—(l-
hydroxypropanyl)—5-(pyrrolidin-l-yl)picolinamide (example 22 a) was reacted with liodofluoropropane
to give the title compound as colorless oil, MS (ISP): 380.265
[MH+].
Example 25
6-(Cyclopropylmethoxy)-N-[(ZS)(flu0rometh0xy)methylpentan-Z-yl](3-
methoxyazetidinyl)pyridine—2-carb0xamide
1 0 a) (S)—6-(Cyclopropylmethoxy)—N—( l -hydroxymethylpentanyl)—5 -(3 -
yazetidin- l -yl)picolinamide
In analogy to the procedure described in example 19 a, 6-(cyclopropylmethoxy)(3-
methoxyazetidin-l colinic acid (CAN 16132923) was condensed with L-leucinol
(CAN 75336) to give the title compound as light yellow oil, MS (ISP): 378.309
[MH+].
b) 6-(Cyclopropylmethoxy)-N-[(ZS)- l -(fluoromethoxy)methylpentanyl] -5 -(3 -
methoxyazetidin- l -yl)pyridinecarboxamide
In analogy to the ure described in example 16, (S)(cyclopropylmethoxy)-N-(l-
hydroxymethylpentanyl)—5-(3 -methoxyazetidin—l -yl)picolinamide was reacted with
iodo-methane to give the title compound as colorless oil, LC-MS (UV peak
area/ESI) 100%, 5 [MH+].
Example 26
6-(Cyclopropylmethoxy)—5-(3,3-difluoroazetidinyl)—N-[(ZS)(2-fluor0ethoxy)—4-
methylpentan-Z-yl]pyridine-Z-carboxamide
| "
a) (S)(Cyclopropylmethoxy)—5 -(3 ,3 -difluoroazetidin- l -yl)-N-( l -hydroxy
methylpentan—2—yl)picolinamide
k MG
In analogy to the procedure described in e 19 a, 6-(cyclopropylmethoxy)—5-(3,3-
difluoroazetidin-l-yl)picolinic acid (CAN 82) was condensed with L-leucinol
(CAN 75336) to give the title compound as light yellow oil, MS (ISP): 384.279
[MH+].
b) 6-(Cyclopropylmethoxy)-5—(3 ,3-difluoroazetidinyl)-N-[(ZS)-l-(2-fluoroethoxy)—4-
methylpentanyl]pyridinecarboxamide
In analogy to the procedure described in example 16, (S)(cyclopropylmethoxy)(3,3-
difluoroazetidin- l -yl)—N-( l -hydroxymethylpentanyl)picolinamide was reacted with
W0 2020l002320
l-fluoroiodoethane to give the title compound as colorless oil, MS (ISP): 430.338.
[MH+].
Example 27
6-(Cyclopr0pylmethoxy)—N-[(2S)—1-(2-fluor0ethoxy)methylpentan-Z-yl] (3-
methoxyazetidinyl)pyridine—2-carb0xamide
In analogy to the procedure described in example 16, (S)(cyclopropylmethoxy)—N-(l-
ymethylpentanyl)—5-(3 -methoxyazetidin—l -yl)picolinamide (example 25 a)
was reacted with l-fluoroiodoethane to give the title nd as colorless oil, MS
(ISP): 424.362 [MH+].
e 28
6-(Cyclopropylmethoxy)—N-[(ZS)(3-fluoropropoxy)—4-methylpentan-Z-yl] (3-
yazetidinyl)pyridine—2-carb0xamide
In analogy to the procedure described in example 16, (S)(cyclopropylmethoxy)-N-(l-
hydroxymethylpentanyl)(3 -methoxyazetidin-l -yl)picolinamide (example 25 a)
was reacted with l-iodofluoropropane to give the title compound as colorless oil, MS
(ISP): 438.375 [MH+].
Example 29
W0 2020l002320
6-(Cyclopropylmethoxy)-N-[(ZS)(flu0rometh0xy)methylbutanyl](3-
methoxyazetidinyl)pyridine—2-carb0xamide
a) (S)(Cyclopropylmethoxy)—N—( l —hydroxymethylbutanyl)-5 -(3-methoxyazetidin-
l -yl)picolinamide
k r\T/COH
| M
In analogy to the procedure described in example 19 a, 6-(cyclopropylmethoxy)(3-
methoxyazetidin-l -y1)picolinic acid (CAN 16132923) was sed with nol
(CAN 20264) to give the title compound as light yellow oil, MS (ISP): 364.252
[MH+].
b) lopropylmethoxy)-N-[(2S)— l -(fluoromethoxy)methylbutanyl] -5 -(3 -
methoxyazetidin- l -yl)pyridinecarboxamide
In analogy to the procedure described in example 16, (S)(cyclopropylmethoxy)-N—(l-
hydroxymethylbutanyl)—5-(3-methoxyazetidin—l -yl)picolinamide was reacted with
fluoro-iodo-methane to give the title compound as colorless oil, MS (ISP): 396.3 [MH+].
Example 30
6-(Cyclopropylmethoxy)—N-[(ZS)(2-fluor0ethoxy)methylbutanyl](3-
methoxyazetidinyl)pyridine—2-carboxamide
W0 2020l002320
In analogy to the procedure bed in example 16, (S)(cyclopropylmethoxy)-N-(l-
hydroxy—3-methylbutan—2-yl)—5—(3-methoxyazetidin-l—yl)picolinamide (example 29 b) was
reacted with l-fluoroiodoethane to give the title compound as colorless oil, MS (ISP):
410.335 [MH+].
e 31
6-(Cyclopropylmethoxy)—N-[(ZS)(3-fluoropropoxy)—3-methylbutanyl](3-
methoxyazetidinyl)pyridine—2-carb0xamide
1O In analogy to the ure described in example 16, (S)(cyclopropylmethoxy)—N-(l-
hydroxymethylbutanyl)—5-(3-methoxyazetidin-l-yl)picolinamide (example 29 b) was
reacted with l-iodofluoropropane to give the title compound as colorless oil, MS (ISP):
424.362 [MH+].
Example 32
6-(Cyclopr0pylmethoxy)—N-[(ZS)(2-fluor0ethoxy)propanyl](3-
methoxyazetidinyl)pyridine—2-carboxamide
a) 6-(Cyclopropylmethoxy)-N- [(1 S)hydroxymethy1-ethy1] (3-methoxyazetidin
yl)pyridinecarboxamide
In analogy to the procedure described in example 19 a, 6-(cyclopropylmethoxy)(3-
methoxyazetidin-l colinic acid (CAN 16132923) was condensed with L-alaninol
(CAN 27493) to give the title compound as light yellow oil, MS (ISP): 336.242
[MH+].
b) 6-(Cyclopropylmethoxy)-N—[(2S)—1-(2-fluoroethoxy)propanyl]-5 -(3 -
methoxyazetidin- l -yl)pyridinecarboxamide
In analogy to the procedure described in example 16, 6-(cyclopropylmethoxy)-N—[(1S)
hydroxy- l -methyl-ethyl]—5 -(3-methoxyazetidin- l -yl)pyridinecarboxamide was reacted
with l-fluoroiodoethane to give the title compound as ess oil, MS (ISP): 0
[MH+].
Example 33
6-(Cyclopr0pylmeth0xy)—N-[(ZS)(3-fluor0propoxy)propan-Z-yl] (3-
methoxyazetidinyl)pyridine—2-carb0xamide
In analogy to the procedure described in example 16, 6-(cyclopropy1methoxy)-N—[(1S)
hydroxy- l -methyl-ethyl]—5 -(3-methoxyazetidin- l -yl)pyridinecarboxamide (example 32
a) was d with l—iodofluoropropane to give the title compound as colorless oil, MS
(ISP): 396.279 [MH+].
Example 34
2019/066811
6-(Cyclopr0pylmethoxy)-N-{3-[(fluoromethoxy)methyl] pentanyl}(3-
methoxyazetidinyl)pyridine—2-carb0xamide
a) 6-(Cyclopropylmethoxy)—N—(3-(hydroxymethyl)pentan-3 -yl)-5 thoxyazetidin- l -
yl)picolinamide
In analogy to the procedure described in example 19 a, 6-(cyclopropylmethoxy)(3-
methoxyazetidin-l colinic acid (CAN 16132923) was condensed with 2-amino
ethylbutan-l-ol (CAN 197920) to give the title compound as light yellow oil, MS
(ISP): 378.303 [MH+].
b) 6-(Cyclopropylmethoxy)-N— {3 -[(fluoromethoxy)methyl]pentan-3—yl} -5 -(3 —
methoxyazetidin- l -yl)pyridinecarboxamide
In analogy to the procedure described in example 16, 6-(cyclopropylmethoxy)-N-(3-
(hydroxymethyl)pentanyl)—5-(3-methoxyazetidin-l-y1)picolinamide was reacted with
fluoro-iodo-methane to give the title compound as colorless oil, MS (ISP): 410.348 [MH+].
Example 35
6-(Cyclopropylmethoxy)—N-{3-[(2-fluoroethoxy)methyl] yl}(3-
methoxyazetidinyl)pyridine—2-carb0xamide
W0 2020l002320
In analogy to the procedure described in example 16, 6-(cyclopropylmethoxy)-N-(3—
(hydroxymethyl)pentanyl)—5-(3-methoxyazetidin-l-yl)picolinamide (example 34 a) was
reacted with l—fluoroiodoethane to give the title compound as light brown oil, MS
(ISP): 424.362 [MH+].
Example 36
6-(Cyclopropylmethoxy)—N-{3-[(3-fluoropropoxy)methyl]pentanyl}-5—(3-
methoxyazetidinyl)pyridine—2-carb0xamide
l/Hq—L
‘3 m
In analogy to the procedure bed in example 16, 6-(cyclopropylmethoxy)-N-(3-
(hydroxymethyl)pentan—3-yl)—5—(3-methoxyazetidin-l—yl)picolinamide (example 34 a) was
reacted with l-iodofluoropropane to give the title nd as light brown oil, MS
(ISP): 6 [MH+].
Example 37
6-(Cyclopr0pylmethoxy)—N-[(2R)—1-(2-fluor0ethoxy)—4-methylpentan-Z-yl]
(pyrrolidinyl)pyridinecarb0xamide
42W“
_ 44 _
a) (R)(Cyclopropylmethoxy)-N—( 1 -hydroxymethylpentanyl)-5 -(pyrrolidin
yl)picolinamide
In analogy to the procedure described in example 19 a, 6-(cyclopropylmethoxy)—5-
(pyrrolidin-l-yl)picolinic acid (CAN 81) was condensed with D—leucinol
(CAN 534482) to give the title compound as colorless oil, MS (ISP): 362.725. [MH+].
b) 6-(Cyclopropylmethoxy)-N-[(2R)(2-fluoroethoxy)methylpentanyl]-5 -
(pyrrolidin-l ridinecarboxamide
In analogy to the procedure described in e 16, (R)(cyclopropylmethoxy)—N-(l-
hydroxymethylpentanyl)—5-(pyrrolidin—l colinamide was reacted with l—fluoro-
2-iodoethane to give the title compound as colorless oil, MS (ISP): 408.359 [MH+].
Example 38
6-(Cyclopr0pylmethoxy)—N-[(2R)—1-(2-fluor0ethoxy)—4-methylpentan-Z-yl] (3-
methoxyazetidinyl)pyridine—2-carboxamide
a) (R)(Cyclopropylmethoxy)-N-( l -hydroxymethylpentany1)-5 -(3 -
methoxyazetidin- l -yl)picolinamide
In analogy to the procedure described in example 19 a, 6-(cyclopropylmethoxy)—5-(3—
methoxyazetidin-l -y1)picolinic acid (CAN 16132923) was condensed with D-leucinol
(CAN 09—2) to give the title compound as light yellow oil, MS (ISP): 378.3 [MHI].
b) 6-(Cyclopropylmethoxy)-N—[(2R)-1 -(2-fluoroethoxy)methy1pentany1]-5 -(3—
methoxyazetidiny1)pyridinecarboxamide
In analogy to the procedure described in example 16, (R)(cyclopropylrnethoxy)—N-(1—
hydroxymethy1pentanyl)—5-(3-methoxyazetidiny1)picolinamide was reacted with
1-fluoroiodoethane to give the title compound as colorless oil, MS (ISP): 424.327
[MH+].
e 39
6-(Cyclopropylmethoxy)—5-(3-fluoromethylazetidinyl)-N-(3-(3-
fluoropropylcarbamoyl)pentanyl)picolinamide
In a 5 mL pear-shaped flask, lopropylmethoxy)(3-fluoromethy1azetidin-1 -
yl)picolinic acid (CAN 18128888, 5 mg, 17.8 umol, Eq: 1.0), oethyl-N-(3-
fluoropropyl)butanamide hloride (CAN 1613239-88—5, 4.45 mg, 19.6 umol, Eq:
1.10), 2-bromoethy1pyridinium tetrafluoroborate (5.37 mg, 19.6 umol, Eq: 1.10) and
DIPEA (8.07 mg, 10.7 uL, 62.4 umol, Eq: 3.50) were combined with 1,4-dioxane (100
uL) to give a light yellow solution. The reaction mixture was stirred for 16 h at ambient
temperature and brought to dryness. The crude was purified by preparative TLC (silica
gel, EtOAc, elution with CHzClz/EtOAc 1:1) to give the title compound (5 mg, 62%) as
white solid, MS (ESI): 453.3 [MHl].
Example 40
Pharmacological tests
The following tests were carried out in order to determine the activity of the compounds of
formula I:
Radioligand binding assay
The y of the compounds of the invention for cannabinoid CB1 receptors was
determined using recommended amounts ofmembrane preparations (PerkinElmer) of
human embryonic kidney (HEK) cells sing the human CNRl or CNR2 receptors in
conjunction with 1.5 or 2.6 nM [3H]—CP-55,940 (Perkin Elmer) as radioligand,
respectively. Binding was performed in binding buffer (50 mM Tris, 5 mM MgC12, 2.5
mM EDTA, and 0.5% l) fatty acid free BSA, pH 7.4 for CB1 receptor and 50 mM
Tris, 5 mM MgCl2, 2.5 mM EGTA, and 0.1% (wt/vol) fatty acid free BSA, pH 7.4 for
CB2 receptor) in a total volume of 0.2 ml for 1h at 30°C shaking. The reaction was
terminated by rapid filtration through ltration plates coated with 0.5%
polyethylenimine (UniFilter GF/B filter plate; Packard). Bound radioactivity was analyzed
for Ki using nonlinear regression analysis (Activity Base, ID ss Solution, Limited),
with the Kd values for [3H]CP55,940 determined from tion ments. The
compounds of a (I) show an excellent affinity for the CB2 receptor.
The compounds according to formula (I) have an activity in the above assay (Ki) between
0.5 nM and 10 uM. Particular compounds of formula (I) have an activity in the above
assay (Ki) between 0.5 nM and 3 uM. Other particular compounds of formula (I) have an
activity in the above assay (Ki) between 0.5 nM and 100 nM.
cAMP Assay
CHO cells expressing human CB1 or CB2 receptors are seeded 17-24 hours prior to the
experiment 50.000 cells per well in a black 96 well plate with flat clear bottom (Corning
Costar #3904) in DMEM (Invitrogen No. 31331), 1x HT supplement, with 10 % fetal calf
serum and incubated at 5% C02 and 37°C in a humidified incubator. The growth medium
was exchanged with Krebs Ringer Bicarbonate buffer with 1 mM IBMX and incubated at
°C for 30 min. Compounds were added to a final assay volume of 100 ul and incubated
for 30 min at 30°C. Using the cAMP—Nano-TRF ion kit the assay (Roche
Diagnostics) was stopped by the addition of 50 ul lysis reagent (Tris, NaCl, 1.5% Triton
X100, 2.5% NP40, 10% NaN3) and 50 ul detection solutions (20 uM mAb Alexa700-
CAMP 1:1, and 48 uM RutheniumAHA-cAMP) and shaken for 2h at room temperature.
The time-resolved energy er is measured by a TRF reader (Evotec Technologies
GmbH), equipped with a ND2YAG laser as excitation source. The plate is measured twice
with the excitation at 355 nm and at the emission with a delay of 100 ns and a gate of 100
ns, total re time 10s at 730 (bandwidth 30 nm) or 645 nm (bandwidth 75 nm),
respectively. The FRET signal is calculated as follows: FRET = T730-Alexa730-P(T645-
B645) with P = B730/Ru645-B645, where T730 is the test well measured at
730 nM, T645 is the test well measured at 645 nm, B730 and B645 are the buffer controls
at 730 nm and 645 nm, respectively. cAMP content is ined from the function of a
standard curve spanning from 10 uM to 0.13 nM CAMP.
ECso values were determined using Activity Base analysis (ID Business Solution,
Limited). The ECso values for a wide range of cannabinoid agonists generated from this
assay for reference compounds were in agreement with the values published in the
scientific literature.
In the foregoing assay, the compounds according to the invention have a human CB2 ECso
which is between 0.5 nM and 10 nM. ular compounds ing to the invention
have a human CB2 ECso between 0.5 nM and 1 uM. Further particular compounds
according to the invention have a human CB2 ECso between 0.5 nM and 100 nM. They
exhibit at least 10 fold selectivity against the human CB1 receptor in, either both of the
radioligand and cAMP assay, or in one of these two assays.
Results obtained for representative compounds of the invention are given in the following
table.
Binding assay
human CB2 Ki
[HM]
2019/066811
Binding assay
human CBZ Ki
[HM]
)—l O
)—A p-A
>—A)—A>—A #UJN
j—A £11
>—A>—A)—t OO\]O\
NNN NHO
NNN GUI-b
DJNN COCO
UJUJ DJN
WO 02320
Binding assay
human CBZ Ki
_ 50 _
Claims (8)
- l. A compound of formula (I) O R2 R3 ROI \j/lL”N >4 0 co AZ/ W 2)\mx R1 A1/ 5 R1 is alkoxyazetidinyl, dihaloazetidinyl or pyrrolidinyl; R2 and R3 are independently selected from hydrogen and alkyl; A1 is -CH- or nitrogen; A2 is -CH2- or carbonyl; X is halogen; 10 nis Oto 3;and m is 0 or 1; provided that m and n are not both 0 at the same time; or a pharmaceutically able salt thereof.
- 2. A compound according to claim 1, wherein R1 is methoxyazetidinyl, 15 difluoroazetidinyl or pyrrolidinyl.
- 3. A compound according to claim 1 or 2, wherein R2 and R3 are independently selected from en, ethyl and butyl.
- 4. A compound according to any one of claims 1 to 3, wherein R2 and R3 are both ethyl at the same time, or one of R2 and R3 is hydrogen and the other one is butyl. 20
- 5. A compound according to any one of claims 1 to 4, wherein A1 is -CH-.
- 6. A compound according to any one of claims 1 to 5, wherein X is fluorine.
- 7. A nd according to any one of claims 1 to 6, wherein n is l, 2 or 3.
- 8. A compound according to any one of claims 1 to 7 selected from W0
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP18180137.4 | 2018-06-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
NZ767476A true NZ767476A (en) |
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