WO2003097636A1 - Novel compounds and their use - Google Patents
Novel compounds and their use Download PDFInfo
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- WO2003097636A1 WO2003097636A1 PCT/SE2003/000795 SE0300795W WO03097636A1 WO 2003097636 A1 WO2003097636 A1 WO 2003097636A1 SE 0300795 W SE0300795 W SE 0300795W WO 03097636 A1 WO03097636 A1 WO 03097636A1
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- pyridin
- trifluoromethyl
- piperazine
- acetate
- alkyl
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- C07D213/02—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members
- C07D213/04—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
- C07D213/60—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
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- C07D401/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings
- C07D401/04—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings directly linked by a ring-member-to-ring-member bond
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- C07D401/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom
- C07D401/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings
- C07D401/12—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings linked by a chain containing hetero atoms as chain links
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- C07D—HETEROCYCLIC COMPOUNDS
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- C07D401/14—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing three or more hetero rings
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- C07D405/00—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom
- C07D405/02—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings
- C07D405/12—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings linked by a chain containing hetero atoms as chain links
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- C07D409/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms
- C07D409/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms containing two hetero rings
- C07D409/12—Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms containing two hetero rings linked by a chain containing hetero atoms as chain links
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- C07D417/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00
- C07D417/14—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing three or more hetero rings
Definitions
- the present invention relates to novel compounds, to pharmaceutical compositions comprising the compounds, to processes for their preparation, as well as to the use of the compounds for the preparation of a medicament which particularly acts on the central nervous system.
- the 5-HT2 c receptor subtype has also been suggested to be involved in CNS disorders such as depression and anxiety (Exp. Opin. Invest. Drugs 1998, 7, 1587- 1599; IDrugs, 1999, 2, 109-120).
- the 5-HT2c receptor subtype has further been suggested to be involved in urinary disorders such as urinary incontinence (IDrugs, 1999, 2, 109-120).
- Compounds which have an effect on the 5-HT2 c receptor may therefore have a therapeutic potential in the treatment of disorders like those mentioned above.
- EP-A 1-863 136 discloses azetidine and pyrrolidine derivatives which are selective 5-HT2 c receptor agonists having antidepressant activity and which can be used for treating or preventing serotonin-related diseases, including eating disorders and anxiety.
- EP-A-657 426 discloses tricyclic pyrrole derivatives having activity on the 5-HT2c receptor and which inter alia may be used for treating eating disorders.
- EP-A-655 440 discloses 1-aminoethylindoles having activity on the 5-HT2 c receptor and which may be used for treating eating disorders.
- EP-A-572 863 discloses pyrazinoindoles having activity on the 5-HT2 c receptor and which may be used for treating eating disorders.
- J. Med. Chem. 1978, 21, 536-542 and US-A-4,081,542 disclose a series of piperazinylpyrazines having central serotonin-mimetic activity.
- ES 514549 discloses piperazine derivative with anorexigenic action.
- EP 370560 discloses l-[mono- or bis(trifluoromethyl)-2- pyridinyljpiperazines as central nervous system agents.
- WO 98/33504 discloses a new medical use of l-[6-chloro-5- (trifluoromethyl)-2-pyridinyl]piperazine, in particular to a new method of treating urinary incontinence.
- WO 02/30902 discloses crystal forms of l-[6-chloro-5-(trifluoromethyl)-2- pyridinyl]piperazine hydrochloride.
- EP 1213017 discloses the use of a 5-HT 2c receptor agonist, e.g., l-[6-chloro- 5-(trifluoromethyl)-2-pyridinyl]piperazine, for the treatment of hot flushes.
- a 5-HT 2c receptor agonist e.g., l-[6-chloro- 5-(trifluoromethyl)-2-pyridinyl]piperazine
- J. Med Chem. 1987, 30, 1210-1214 discloses N,N-disubstituted 6-alkoxy-2- pyridinamines as anticonvulsant agents including l-(6-methoxy-2- pyridinyl)piperazine, l-(6-ethoxy-2-pyridinyl)piperazine, l-(6-isopropoxy-2- pyridinyl)piperazine, l-(6-isobutoxy-2-pyridinyl)piperaz_ne, l-(6- cyclopropylmethoxy-2-pyridinyl)piperazine, l-(6-cyclohexylmethoxy-2- pyridinyl)piperazine, and l-(6-cyclohexyloxy-2-pyridinyl)piperazine.
- J. Med. Chem. 1989, 32, 1237-1242 discloses 6-alkyl-N,N-disubstituted-2- pyridinamines as anticonvulsant agents including l-(6-butylthio-2- pyridinyl)piperazine, l-(6-cyclohexylmethyl-2-pyridinyl)piperazine and l-[6-(2- phenylethyl)-2-pyridinyl]piperazine.
- JP 07300474 discloses drugs for treatment of diseases related to serotoninergic nerve including l-(6-phenoxy-2-pyridinyl)piperazine and l-[6- (substituted)phenoxy-2-pyridinyl]piperazines, 1 -(6-benzyloxy-2- pyridinyl)piperazine, l-(6-cyclobutyloxy-2-pyridinyl)piperazine, and l-(6- cyclopentyloxy-2-pyridinyl)piperazine
- EP 580465 discloses heterocyclic piperazines as 5-HT 3 agonists including 6-chloro-2-(3-methylpiperazinyl)pyrid_ne and 6-chloro-2-(4- methylpiperazinyl)pyridine.
- WO 00/12475 discloses indoline derivatives as 5-HT2b and/or 5-HT2 c receptor ligands, especially for the treatment of obesity.
- WO 00/12510 discloses pyrroloindoles, pyridoindoles and azepinoindoles as 5-HT2c receptor agonists, particularly for the treatment of obesity.
- WO 00/12482 discloses indazole derivatives as selective, directly active 5-HT2c receptor ligands, preferably 5-HT2 c receptor agonists, particularly for use as anti-obesity agents.
- WO 00/12502 discloses pyrroloquino lines as 5-HT2 c receptor agonists, particularly for use as anti-obesity agents.
- WO 00/35922 discloses 2,3,4,4 ⁇ -tetrahydro-lH-pyrazino[l,2- ]quinoxalin- 5(6H)ones as 5 ⁇ T2 C agonists, which may be used for the treatment of obesity.
- WO 00/44737 discloses aminoalkylbenzofurans as 5-HT2 c agonists, which may be used for the treatment of obesity.
- WO 95/01976 discloses indoline derivatives active as 5-HT2 c antagonists and of potential use in the treatment of CNS disorders.
- WO 99/58490 discloses aryl-hydronaphthalen-alkanamines which may effectuate partial or complete blockage of serotonergic 5-HT2 c receptors in an organism.
- WO 03/00666 discloses [l,2']bipyrazinyl 5-HT 2 receptor ligands, in particular 5-HT 2c receptor ligands, for the treatment of sexual dysfunction.
- WO 03/00663 discloses piperazinylpyrimidines as 5-HT 2 receptor ligands, in particular 5-HT 2c receptor ligands, for the treatment of sexual disorders.
- WO 02/51844 discloses cycloalkyl fused indole derivatives and their use as 5-HT 2b and 5-HT 2c receptor ligands.
- WO 02/42304 discloses cyclopenta[b] [ 1 ,4]diazepino[6,7-hi]indoles as selective 5-HT 2c receptor agonists.
- WO 02/36596 discloses diazepinocarbazoles and related compounds as serotonin 5-HT 2c agonists.
- R is selected from H, C alkyl, 2-hydroxyethyl, 2-cyanoethyl, tetrahydropyran-2-yl, and a nitrogen protecting group;
- R 2 and R 3 each, independently, represent H or CH 3 ;
- R 4 is selected from halogen, O-R 5 , NH-R 5 or S-R 5 , wherein R 5 is selected from aryl, aryl-C ⁇ -6 -alkyl, aryloxy-C 2-6 -alkyl, heteroaryl, heteroaryl-C 1-6 -alkyl, heteroaryloxy-C 2-6 -alkyl, C 3-6 -cycloalkyl, C 3-6 -cycloalkyl-C ⁇ - - alkyl, C ⁇ -6 -alkyl, 2-tetrahydrofuryl, 3-tetrahydrofuryl, 2-tetrahydrofurfuryl, 3- tetrahydrofurfuryl, piperidine-4-yl, tetrahydropyran-4-yl, C 3-6 -alkynyl, C 3-6 -alkenyl, or fluoro-C 2 _ 4 -alkyl; and wherein any aryl or heteroaryl residue, alone or as part
- R 6 and R 7 are, independently of each other, hydrogen, methyl or ethyl; or form a pyrro lidine, piperazine, morpholine, thiomorpholine or a piperidine ring together with the nitrogen atom to which they are bound; and wherein any aryl or heteroaryl residue as substituents on aryl or heteroaryl, alone or as part of another group, in turn may be substituted in one or more positions, preferably one, independently of each other by C ⁇ - -alkyl, C ⁇ - alkoxy, halogen, trifluoromethyl, cyano, hydroxy or dimethylamino; and pharmaceutically acceptable salts, hydrates, solvates, geometrical isomers, tautomers, optical isomers, N-oxides and prodrug forms thereof, with the proviso that, when R 4 is halogen at least one of R , R , or R is not hydrogen. When R 4 is halogen, it is preferred that either:
- R is selected from C M alkyl, 2-hydroxyethyl, 2-cyanoethyl, tetrahydropyran-2-yl, and a nitrogen protecting group; or
- R is selected from H, C ⁇ -4 alkyl, 2-hydroxyethyl, 2-cyanoethyl, tetrahydropyran-2-yl, and a nitrogen protecting group; and at least one ofR 2 and R 3 is CH 3 ;
- the invention comprises the racemic mixture as well as the individual enantiomers as such.
- the invention comprises the tautomeric forms of the compounds as well as mixtures thereof.
- the compounds of formula (I) can be in the form of geometrical isomers, the invention comprises the geometrical isomers as well as mixtures thereof.
- the invention provides the compounds according to formula (I) above for use in therapy.
- Still another aspect of the invention provides a pharmaceutical composition
- a pharmaceutical composition comprising a compound according to formula (I) above as the active ingredient, preferably together with a pharmaceutically acceptable carrier and, if desired, other pharmacologically active agents.
- the invention provides a method for the prophylaxis or treatment of a serotonin-related disorder or condition in a subject in need of such prophylaxis or treatment, the method comprising administering to the subject an effective amount of a compound of formula (I).
- the serotonin- related disorder or condition is a 5-HT2 c receptor-related disorder or condition, especially memory disorders; Alzheimer's disease; schizophrenia; mood disorders; anxiety disorders; pain; substance abuse; sexual dysfunction; epilepsy; glaucoma; urinary incontinence; menopausal and post-menopausal hot flushes; type II diabetes; eating disorders; binge eating disorders; anorexia nervosa; bulimia; or weight gain associated with antipsychotic drug administration; and most preferably obesity.
- the subject is preferably a human or an animal.
- the method includes administering an effective amount of a compound of formula (I), or a composition having a compound of formula (I) in it.
- Another aspect of the invention relates to the use of the compounds of formula (I) in the manufacture of a medicament for the prophylaxis or treatment of a serotonin-related disorder or condition.
- the serotonin-related disorder or condition is a 5-HT2c receptor-related disorder or condition, especially memory disorders; Alzheimer's disease; schizophrenia; mood disorders; anxiety disorders; pain; substance abuse; sexual dysfunction; epilepsy; glaucoma; urinary incontinence; menopausal and post-menopausal hot flushes; type II diabetes; eating disorders; binge eating disorders; anorexia nervosa; bulimia; or weight gain associated with antipsychotic drug administration; and most preferably obesity.
- a method for modulating 5HT2 C receptor function is an aspect of the invention.
- the methods delineated herein can also include the step of identifying that a subject is in need of treatment of serotonin-related disorders or conditions, particularly 5-HT2 c receptor-related, in the subject.
- the compounds may act as receptor agonists or antagonists at the 5-HT2 c receptor and may therefore be used for the treatment of serotonin-related disorders or conditions, particularly 5-HT2c receptor- related.
- C ⁇ -6 alkyl refers to straight-chained and branched alkyl groups containing from 1 to 6 carbon atoms. Particular C ⁇ -6 alkyl groups are methyl, ethyl, n-propyl, isopropyl, tert-butyl, n-pentyl, isopentyl, n-hexyl, and isohexyl. Derived expressions such as “C M alkoxy” and "C M alkylthio" are to be constructed accordingly.
- C 2-6 alkenyl refers to straight-chained and branched alkenyl groups containing from 2 to 6 carbon atoms. Typical examples include vinyl, allyl, 3,3-dimethylallyl, 1-butenyl, and 2-butenyl groups.
- C 2-6 alkynyl refers to straight-chained and branched alkynyl groups containing from 2 to 6 carbon atoms. Typical examples include ethynyl and propargyl groups.
- heteroatom nitrogen, oxygen, sulphur, and in heterocyclic rings (including heteroaromatic as well as saturated and partially saturated heterocyclic rings), also selenium.
- aryl is intended to include aromatic rings (monocyclic or bicyclic) having from 6 to 10 ring carbon atoms, such as phenyl, 1-naphthyl, 2-naphthyl, 1,2,3,4-tetrahydronaphthyl, and indanyl.
- the aryl group can be linked to the remainder of the molecule via a carbon atom in any ring.
- heteroaryl means a mono- or bicyclic aromatic ring system, only one ring need be aromatic, and which can be linked to the remainder of the molecule via a carbon or nitrogen atom in any ring, and having from 5 to 10 ring atoms (mono- or bicyclic), in which one or more of the ring atoms are heteroatoms such as nitrogen, sulphur, oxygen and selenium and the remainder are carbon atoms.
- heteroaryl rings examples include pyrrole, imidazole, thiophene, furan, thiazole, isothiazole, thiadiazole, oxazole, isoxazole, oxadiazole, pyridine, pyrazine, pyrimidine, pyridazine, pyrazole, triazole, tetrazole, chroman, isochroman, coumarin, quinoline, quinoxaline, isoquinoline, phthalazine, cinnoline, quinazoline, indole, isoindole, indoline, isoindoline, benzothiophene, benzofuran, 2,3-dihydrobenzofuran, isobenzofuran, benzoxazole, 2,1,3-benzoxadiazole, benzothiazole, 2,1,3- benzothiadiazole, 2,1,3-benzoselenadiazole, benzimidazole
- Exemplary aryl-C ⁇ -6 -alkyl in which the alkyl portion of the group may be straight or branched, include benzyl, 2-naphthylmethyl, 2-phenylethyl, 3-phenyl-l- propyl, 1-phenylethyl, l-phenyl-2-propyl, 2-phenyl-l-propyl and the like.
- Exemplary aryloxy-C 2 - 6 -alkyl in which the alkyl portion of the group may be straight or branched, include 2-phenoxyethyl, 2-(l-naphthyloxy)ethyl, 3-(2- naphthyloxy)-l-propyl, 3-phenoxy-l-propyl, 4-phenoxy-l -butyl, 5-phenoxy-l- pentyl, l-phenoxy-2-propyl and the like.
- Exemplary C 3 . 6 -cycloalkyl-C 1 . 4 -a.kyl in which the alkyl portion of the group may be straight or branched, include cyclopropylmethyl, cyclopentylmethyl, 2- cyclohexylethyl, 1-cyclohexylethyl, 1-cyclopropyl ethyl, 1-cyclobutylethyl and the like.
- Exemplary heteroaryloxy-C 2 - 6 -alkyl include 2-(8-quinolinyloxy)ethyl, 2-(3- pyridinyloxy)ethyl, 3-(8-quinolinyloxy)propyl and the like.
- Halogen includes fluorine, chlorine, bromine or iodine, preferably fluorine, chlorine or bromine.
- N-oxides means that one or more nitrogen atoms, when present in a compound, are in N-oxide form ( ⁇ O).
- prodrug forms means a pharmacologically acceptable derivative, such as a carbamate or an amide, which derivative is biotransformed in the body to form the active drug.
- pharmacologically acceptable derivative such as a carbamate or an amide
- Biotransformation of Drugs p. 13-15.
- “Pharmaceutically acceptable” means being useful in preparing a pharmaceutical composition that is generally safe, non-toxic and neither biologically nor otherwise undesirable and includes being useful for veterinary use as well as human pharmaceutical use.
- “Pharmaceutically acceptable salts” mean salts which are pharmaceutically acceptable, as defined above, and which possess the desired pharmacological activity.
- Such salts include acid addition salts formed with organic and inorganic acids, such as hydrogen chloride, hydrogen bromide, hydrogen iodide, sulfuric acid, phosphoric acid, acetic acid, glycolic acid, maleic acid, malonic acid, malic acid, oxalic acid, toluenesulphonic acid, methanesulphonic acid, fumaric acid, succinic acid, tartaric acid, citric acid, benzoic acid, ascorbic acid and the like.
- organic and inorganic acids such as hydrogen chloride, hydrogen bromide, hydrogen iodide, sulfuric acid, phosphoric acid, acetic acid, glycolic acid, maleic acid, malonic acid, malic acid, oxalic acid, toluenesulphonic acid, methanesulphonic acid, fumaric acid, succinic acid, tartaric acid, citric acid, benzoic acid, ascorbic acid and the like.
- a nitrogen protecting group (e a value for R 1 ) refers to a group covalently bonded to a nitrogen atom, or any group used to derivatize nitrogen atom (e.g., the nitrogen atom in an amino group).
- the group may be introduced or cleaved off by conventional methods such as those described in Protective Groups in Organic Synthesis, John Wiley & Sons, 1991.
- Examples of the nitrogen protecting groups include trityl or t-butoxycarbonyl and those delineated in Protective Groups in Organic Synthesis, John Wiley & Sons, 1991 and subsequent editions thereof.
- R 1 is hydrogen
- R 4 is selected from chlorine, O-R 5 , and S-R 5 .
- R 5 is selected from aryl-C ⁇ . 6 -alkyl, aryloxy-C 2 . 6 -alkyl, heteroaryl-C ⁇ -6 -alkyl, heteroaryloxy-C 2-6 -alkyl, C -6 -cycloalkyl, C 3-6 -cycloalkyl-CM- alkyl, C ⁇ -6 -alkyl, 2-tetrahydrofurfuryl, and wherein any aryl or heteroaryl residue, alone or as part of another group, may be unsubstituted or substituted with one or more of C ⁇ - 4 -alkyl, C ⁇ . 4 -alkoxy, cyano, halogen, or aryloxy-C M -alkyl.
- R 5 is selected from benzyl, 2-chlorobenzyl, 3- cyanobenzyl, 2-cyclohexylethyl, cyclopentyl, 2-cyclopentylethyl, 2,3-difluorobenzyl, 2,6-difluorobenzyl, 2-(2,6-difluorophenoxy)ethyl, 2,3-dihydrobenzo[l,4]dioxin-6- ylmethyl, ethyl, 5-fluoro-2-methoxybenzyl, furan-2-ylmethyl, methyl, ⁇ - methylbenzyl, 3-methylbenzyl, 2-(naphthalene-2-yloxy)ethyl, 2-phenoxyethyl, 2- phenoxymethylbenzyl, n-propyl, 3-(pyridin-3-yl)-n-propyl, 2-(8-quinolinyloxy)ethyl, tetrahydrofuran-2
- the carbon atom, to which R 2 is attached has the (S)- configuration when R is methyl and R and R both are hydrogen.
- the carbon atom, to which R 3 is attached has the (R)- configuration when R is methyl and R and R both are hydrogen.
- Preferred compounds of the general formula (I) above are the following compounds (corresponding to Examples 6-43 below): l-(6-Chloro-5-trifluoromethyl-pyridin-2-yl)-3-(S)-methyl-piperazine • 1 -(6-Chloro-5-trifluoromethyl-pyridin-2-yl)-3-(R)-methylpiperazine l-(6-Chloro-5-trifluoromethyl-pyridin-2-yl)-2-(R)-methyl-piperazine l-(6-Chloro-5-trifluoromethyl-pyridin-2-yl)-2-(S)-methyl-piperazine, hydrochloride l-[6-(2-Phenoxy-ethoxy)-5-trifluoromethyl-pyridin-2-yl]-piperazine, acetate • l-[6-(2,3-Dihydro-ber_zo[l,4]dioxin-6-ylmethoxy)-5-triflu
- the compounds of the present invention are useful for the treatment, including prophylactic treatment, of serotonin-related, especially 5- HT2c receptor-related, disorders and conditions, in a human being or in an animal, including e.g. pets, such as memory disorders; Alzheimer's disease; schizophrenia; mood disorders, including, but not restricted to, major depression and bipolar depression, including both mild and manic bipolar disorder, seasonal affective disorder (SAD); anxiety disorders, including situational anxiety, generalized anxiety disorder, primary anxiety disorders (panic disorders, phobias, obsessive-compulsive disorders, and post-traumatic stress disorders), and secondary anxiety disorders (for example anxiety associated with substance abuse); pain; substance abuse; sexual dysfunction; epilepsy; glaucoma; urinary incontinence; menopausal and post- menopausal hot flushes; type II diabetes; eating disorders; binge eating disorders; anorexia nervosa; bulimia; or weight gain associated with antipsychotic drug administration; and particularly obesity.
- SAD seasonal affective
- the compounds of the present invention in radiolabelled form may be used as a diagnostic agent. Processes for preparation
- This invention also relates to a method for preparing a pharmaceutical composition, the method comprising combining a compound of formula (I) with a pharmaceutically acceptable carrier.
- This invention also relates to methods of making compounds of any formulae delineated herein comprising reacting any one or more of the compounds or formulae delineated herein including any processes delineated herein.
- the invention is a method of making a compound of formula (I) delineated herein.
- the compounds of general formula (I) above may be prepared by, or in analogy with, conventional methods, and especially according to or in analogy with the following method.
- R 1 , R 2 , and R 3 are as defined above; in a solvent such as dimethylsulfoxide (DMSO), acetonitrile, dioxane, tetrahydrofuran (THF), H-butanol, N,N- dimethylformamide (DMF), or in a mixture of solvents such as DMF/dioxane, optionally in the presence of a base, such as K 2 CO 3 , ⁇ a 2 C ⁇ 3 , CS 2 CO 3 , NaOH, triethylamine, pyridine or the like, at 0-200 °C for 1-24 hours to produce a compound of formula (IV):
- a solvent such as dimethylsulfoxide (DMSO), acetonitrile, dioxane, tetrahydrofuran (THF), H-butanol, N,N- dimethylformamide (DMF), or in a mixture of solvents such as DMF/dioxane
- a base
- R , R , and R are as defined above and Hal is halogen.
- the compound of formula (IV) is reacted with an appropriate alcohol, amine, or thiol as defined by O-R 5 , NH-R 5 or S-R 5 above, or its corresponding anions to produce a compound of the formula (I) above.
- the appropriate alcohol, amine, or thiol may be converted completely or partially to its corresponding anion by treatment with bases, such as triethylamine, l,8-diazabicyclo[5.4.0]undec-7-ene, K 2 CO , NaOH, NaH, KO-t-Bu, lithium diisopropylamide or the like.
- the reaction is carried out in a solvent, such as DMSO, dioxane, THF, tert-butanol or DMF, at 0- 200 °C for 1-24 hours.
- An obtained compound of formula (I) above may be converted to another compound of formula (I) by methods well known in the art.
- the chemicals used in the above-described synthetic routes may include, for example, solvents, reagents, catalysts, protecting group and deprotecting group reagents.
- the methods described above may also additionally include steps, either before or after the steps described specifically herein, to add or remove suitable protecting groups in order to ultimately allow synthesis of the compounds of formula (I).
- R 1 is a nitrogen protecting group as defined above
- the subsequent N- deprotection is carried out by conventional methods.
- various synthetic steps may be performed in an alternate sequence or order to give the desired compounds.
- Synthetic chemistry transformations and protecting group methodologies useful in synthesizing applicable compounds are known in the art and include, for example, those described in R. Larock, Comprehensive Organic Transformations, VCH Publishers (1989); T.W. Greene and P.G.M. Wuts, Protective Groups in Organic Synthesis, 2 nd Ed., John Wiley and Sons (1991); L. Fieser and M. Fieser, Fieser andFieser's Reagents for Organic Synthesis, John Wiley and Sons (1994); and L. Paquette, ed., Encyclopedia of Reagents for Organic Synthesis, John Wiley and Sons (1995); and subsequent editions thereof.
- a pharmaceutically acceptable acid addition salt may be obtained by dissolving the free base in a suitable organic solvent and treating the solution with an acid, in accordance with conventional procedures for preparing acid addition salts from base compounds.
- addition salt forming acids are maleic acid, fumaric acid, succinic acid, methanesulfonic acid, acetic acid, malic acid, oxalic acid, benzoic acid, hydrochloric acid, sulphuric acid, phosphoric acid, and the like.
- the compounds of formula (I) may possess one or more chiral carbon atoms, and they may therefore be obtained in the form of optical isomers, e.g. as a pure enantiomer, or as a mixture of enantiomers (racemate) or as a mixture containing diastereomers.
- optical isomers e.g. as a pure enantiomer, or as a mixture of enantiomers (racemate) or as a mixture containing diastereomers.
- the separation of mixtures of optical isomers to obtain pure enantiomers is well known in the art and may, for example, be achieved by fractional crystallization of salts with optically active (chiral) acids or by chromatographic separation on chiral columns.
- the necessary starting materials for preparing the compounds of formula (I) are either known or may be prepared in analogy with the preparation of known compounds.
- the compounds of fo ⁇ nula (I), in the form of free bases or salts with physiologically acceptable acids can be brought into suitable galenic forms, such as compositions for oral use, for injection, for nasal spray administration or the like, in accordance with accepted pharmaceutical procedures.
- suitable galenic forms such as compositions for oral use, for injection, for nasal spray administration or the like, in accordance with accepted pharmaceutical procedures.
- Such pharmaceutical compositions according to the invention comprise an effective amount of the compounds of formula (I) in association with compatible pharmaceutically acceptable carrier materials, or diluents, as are well known in the art.
- the carriers may be any inert material, organic or inorganic, suitable for enteral, percutaneous, subcutaneous or parenteral administration, such as: water, gelatin, gum arabicum, lactose, microcrystalline cellulose, starch, sodium starch glycolate, calcium hydrogen phosphate, magnesium stearate, talcum, colloidal silicon dioxide, and the like.
- Such compositions may also contain other pharmacologically active agents, and conventional additives, such as stabilizers, wetting agents, emulsifiers, flavoring agents, buffers, and the like.
- compositions according to the invention can e.g. be made up in solid or liquid form for oral administration, such as tablets, pills, capsules, powders, syrups, elixirs, dispersible granules, cachets, suppositories and the like, in the foim of sterile solutions, suspensions or emulsions for parenteral administration, sprays, e.g. a nasal spray, transdermal preparations, e.g. patches, and the like.
- oral administration such as tablets, pills, capsules, powders, syrups, elixirs, dispersible granules, cachets, suppositories and the like, in the foim of sterile solutions, suspensions or emulsions for parenteral administration, sprays, e.g. a nasal spray, transdermal preparations, e.g. patches, and the like.
- the compounds of the invention may be used for the treatment of serotonin-related, especially 5-HT2 C receptor-related disorders and conditions in a human being or an animal, such as memory disorders including Alzheimer's disease; schizophrenia; mood disorders; anxiety disorders; pain; substance abuse; sexual dysfunction; epilepsy; glaucoma; urinary incontinence; menopausal and post-menopausal hot flushes; type II diabetes; eating disorders, such as binge eating disorders, anorexia nervosa and bulimia; weight gain associated with antipsychotic drug administration; and particularly obesity.
- memory disorders including Alzheimer's disease; schizophrenia; mood disorders; anxiety disorders; pain; substance abuse; sexual dysfunction; epilepsy; glaucoma; urinary incontinence; menopausal and post-menopausal hot flushes; type II diabetes; eating disorders, such as binge eating disorders, anorexia nervosa and bulimia; weight gain associated with antipsychotic drug administration; and particularly obesity.
- a method for modulating e.g., inhibiting or stimulating
- the method includes administering to a subject in need thereof an effective amount of a compound of the formula (I).
- the methods delineated herein can also include the step of identifying that a subject is in need of treatment of serotonin-related, especially 5-HT2 C receptor- related, disorders and conditions in the subject (e.g., a mammal , a human being, a horse, a dog, or a cat).
- an effective amount refers to an amount of a compound, which confers a therapeutic effect on the treated subject.
- the therapeutic effect may be objective (i.e., measurable by some test or marker) or subjective (i.e., subject gives an indication of or feels an effect).
- the compounds of the invention are formulated into pharmaceutical formulations for oral, rectal, parenteral or other mode of administration.
- the amount of active compounds is between 0.1-95% by weight of the preparation, preferably between 0.2-20% by weight in preparations for parenteral use and preferably between 1 and 50% by weight in preparations for oral administration.
- the dose level and frequency of dosage of the specific compound will vary depending on a variety of factors including the potency of the specific compound employed, the metabolic stability and length of action of that compound, the patient's age, body weight, general health, sex, diet, mode and time of administration, rate of excretion, drug combination, the severity of the condition to be treated, and the patient undergoing therapy.
- the daily dosage may, for example, range from about 0.001 mg to about 100 mg per kilo of body weight, administered singly or multiply in doses, e.g. from about 0.01 mg to about 25 mg each. Normally, such a dosage is given orally but parenteral administration may also be chosen.
- the 1H-and 13 C-NMR-spectra were obtained with a Bruker DPX 400.
- the DPFGSE-NOE experiments were obtained with a Varian INOVA 400.
- the mixing time was 0.8 seconds.
- the preparative LC was performed on a preparative LC-MS Gilson-Finnigan with a 50x20mm S 5 ⁇ m, 120A column. The flow was 30 mL/min and different gradients of 0.1% acetic acid in water and acetonitrile were used.
- the accurate masses were determined with a Micromass LCT with electrospray ionization.
- the elemental analyses were performed with a Vario EL instrument. A Koefler bench was used to measure the melting points, which are not corrected.
- Step 2 l-(6-Chloro-5-trifluoromethyl-pyridin-2-yl)-piperazine * The title compound was prepared from the product of Step 1 above using the
- Step 1 4-(6-Chloro-5-trifluoromethyl-pyridin-2-yl)-2-(S)-methyl-piperazine-l- carboxylic acid tert-butyl ester.
- Step 2 l-(6-Chloro-5-trifluoromethyl-pyridin-2-yl)-3-(S)-methyl-piperazine.
- Step 1 4-(6-Chloro-5-tri ⁇ uoromethyl-pyridin-2-yl)-2-(R)-methyl-piperazine-l- carboxylic acid tert-butyl ester.
- Step 2 l-(6-Chloro-5-trifluoromethyl-pyridin-2-yl)-3-(R)-methylpiperazine.
- Step 1 l-(6-Chloro-5-trifluoromethyl-pyridin-2-yl)-2-(S)-methyl-4-trityl-piperazine.
- the title compound was prepared starting from 3-(S)-methyl-l-trityl- piperazine (obtained in Example 3) using the procedure given in Example 8 for the (R)-isomer. Light yellow crystals; yield 5.1 g (43 %). Purity 96% (HPLC); mp 210 °C. Fragmenting MS analysis supports the stated structure. Anal. (C 30 H 2 C1F N 3 ) C, H, N.
- Step 2 l-(6-Chloro-5-trifluoromethyl-pyridin-2-yl)-2-(S)-methyl-piperazine, Hydrochloride.
- volumes are expressed as total volumes. To a 16 mm test tube was added; • 0.5 mmol of the appropriate alcohol or thiol
- Mass detection was obtained by a Micro Mass LCP with electrospray positive ionization mode.
- the analytical HPLC-chromatograms were performed on a Hewlett Packard 1100 with a 50x4.6mm Grom-SIL 100 ODS 0 AB, 3 ⁇ m column and a 50x4.6 mm YMC-AQ 5 ⁇ m column. Different gradients of 0.1% TFA in water and acetonitrile were used and the peaks were detected at 254 nm. The area% under the largest peak was reported as the purity. Chart 1.
- EXAMPLE 30 1 -(6-EthylsuIfanyl-5-trifluoromethyl-pyridin-2-yl)-2-(R)-methyl-piperazine, acetate.
- the active ingredient 1 is mixed with ingredients 2, 3, 4 and 5 for about 10 minutes.
- the magnesium stearate is then added, and the resultant mixture is mixed for about 5 minutes and compressed into tablet form with or without film-coating.
- the ability of a compound of the invention to bind or act at specific 5-HT receptor subtypes can be determined using in vitro and in vivo assays known in the art. The biological activity of compounds prepared in the Examples was tested using different tests.
- the 5-HT2c receptor affinity of compounds in the Examples was determined in competition experiments, where the ability of each compound in serial dilution to displace ⁇ H-labelledlabeled 5-HT, bound to membranes prepared from a transfected HEK293 cell line stably expressing the human 5-HT2 c receptor protein, was monitored by Scintillation Proximity Assay technology. Non-specific binding was defined using 5 ⁇ M mianserin. Results obtained for exemplary compounds of the invention are illustrated in Table 1 below.
- the 5-HT2 c receptor affinity values, expressed as percent inhibition of binding of the radioligand at 50 nM of test compound, were in the range of 10%-95%.
- the Kj values for the compounds towards the 5-HT 2C receptor were in the range 0.5-5000 nM.
- Examples was determined by the ability of each compound to mobilise intracellular calcium in transfected HEK293 cells, stably expressing the human 5-HT2 c receptor protein, using the calcium-chelating fluorescent dye FLUO-3 (Sigma, St. Louis, MO, U.S.A.). The maximum responses of the compounds in the Examples were in the range of 0-102% relative to the maximum response of 5-HT (serotonin) at a concentration of 1 ⁇ M.
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Abstract
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NZ536409A NZ536409A (en) | 2002-05-17 | 2003-05-16 | New piperazine compounds and their use in the treatment of serotonin-related disorders |
EP03725958A EP1506185B1 (en) | 2002-05-17 | 2003-05-16 | Compounds and their use as inhibitors of 5-ht |
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EA200401526A EA007543B1 (en) | 2002-05-17 | 2003-05-16 | 4-3(trifluoromethyl-pyridine-5-yl)piperazine derivatives, pharmaceutical composition, methods of their preparing and use |
JP2004505369A JP4865221B2 (en) | 2002-05-17 | 2003-05-16 | New compounds and their use |
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SI200330377T SI1506185T1 (en) | 2002-05-17 | 2003-05-16 | Compounds and their use as inhibitors of 5-ht |
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JPWO2006022420A1 (en) * | 2004-08-25 | 2008-05-08 | 武田薬品工業株式会社 | Preventive and therapeutic agent for stress urinary incontinence and screening method thereof |
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Also Published As
Publication number | Publication date |
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AU2003228196A1 (en) | 2003-12-02 |
EP1506185A1 (en) | 2005-02-16 |
HK1084941A1 (en) | 2006-08-11 |
MXPA04011437A (en) | 2005-02-17 |
ATE327229T1 (en) | 2006-06-15 |
AU2003228196B2 (en) | 2009-12-17 |
NZ536409A (en) | 2007-11-30 |
EA007543B1 (en) | 2006-10-27 |
CY1105162T1 (en) | 2010-03-03 |
DK1506185T3 (en) | 2006-10-02 |
EA200401526A1 (en) | 2005-04-28 |
IL164974A0 (en) | 2005-12-18 |
SI1506185T1 (en) | 2006-10-31 |
CN1701068A (en) | 2005-11-23 |
SE0201544D0 (en) | 2002-05-17 |
CA2483619A1 (en) | 2003-11-27 |
RS99804A (en) | 2006-12-15 |
EP1506185B1 (en) | 2006-05-24 |
CN1329389C (en) | 2007-08-01 |
ES2263971T3 (en) | 2006-12-16 |
JP4865221B2 (en) | 2012-02-01 |
KR20050026702A (en) | 2005-03-15 |
US7229997B2 (en) | 2007-06-12 |
DE60305484D1 (en) | 2006-06-29 |
BR0310077A (en) | 2005-02-22 |
PT1506185E (en) | 2006-10-31 |
NO20045486L (en) | 2005-02-02 |
DE60305484T2 (en) | 2006-11-09 |
US20030232814A1 (en) | 2003-12-18 |
JP2005529926A (en) | 2005-10-06 |
ZA200408975B (en) | 2005-11-14 |
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