Piperidine Derivatives Piperidinderivate Derives De Piperidine

(19) TZZ_¥Z_T

(11) EP 1 669 350 B1

(12) EUROPEAN PATENT SPECIFICATION

(45) Date of publication and mention (51) Int Cl.: of the grant of the patent: C07D 211/58 (2006.01) C07D 401/06 (2006.01) 29.02.2012 Bulletin 2012/09 C07D 401/14 (2006.01) C07D 401/02 (2006.01) C07D 401/12 (2006.01) C07D 409/12 (2006.01) (2006.01) (2006.01) (21) Application number: 04787951.5 A61K 31/4545 A61K 31/496 A61K 31/454 (2006.01) A61K 31/4523 (2006.01) A61K 31/4535 (2006.01) A61K 31/506 (2006.01) (22) Date of filing: 21.09.2004 A61P 43/00 (2006.01) A61P 3/04 (2006.01) A61P 3/10 (2006.01) A61P 5/00 (2006.01) A61P 3/06 (2006.01) A61P 19/06 (2006.01) A61P 9/10 (2006.01) A61P 9/04 (2006.01) A61P 9/12 (2006.01)

(86) International application number: PCT/JP2004/013768

(87) International publication number: WO 2005/028438 (31.03.2005 Gazette 2005/13)

(54) PIPERIDINE DERIVATIVES PIPERIDINDERIVATE DERIVES DE PIPERIDINE

(84) Designated Contracting States: • TOKITA, Shigeru, AT BE BG CH CY CZ DE DK EE ES FI FR GB GR c/o Tsukuba Research Institute HU IE IT LI LU MC NL PL PT RO SE SI SK TR Tsukuba-shi, Designated Extension States: Ibaraki 3002611 (JP) LT LV • KANATANI, Akio, c/o Tsukuba Research Institute (30) Priority: 22.09.2003 JP 2003330758 Tsukuba-shi, Ibaraki 3002611 (JP) (43) Date of publication of application: 14.06.2006 Bulletin 2006/24 (74) Representative: Rollins, Anthony John et al Merck Sharp & Dohme Limited (73) Proprietor: MSD K.K. European Patent Department Chiyoda-ku Hertford Road Tokyo Hoddesdon 102-8667 (JP) Hertfordshire EN11 9BU (GB)

(72) Inventors: (56) References cited: • OHTAKE, N. WO-A1-2004/037257 WO-A2-02/076925 Tsukuba Res. Inst. Banyu Pharmaceutical WO-A2-02/099388 WO-A2-2004/069792 Ibaraki 300-2611 (JP) JP-A- 5 078 316 JP-A- 10 324 695 • MIZUTANI, Sayaka, JP-A- 2001 522 836 c/o Tsukuba Research Institute Tsukuba-shi Ibaraki 3002611 (JP) • YOSHIMOTO, Ryo, c/o Tsukuba Research Institute Tsukuba-shi, Ibaraki 3002611 (JP)

Note: Within nine months of the publication of the mention of the grant of the European patent in the European Patent Bulletin, any person may give notice to the European Patent Ofﬁce of opposition to that patent, in accordance with the Implementing Regulations. Notice of opposition shall not be deemed to have been ﬁled until the opposition fee has been paid. (Art. 99(1) European Patent Convention). EP 1 669 350 B1

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• DATABASECA[Online]CHEMICALABSTRACTS SERVICE, COLUMBUS, OHIO, US; LUBISCH, WILFRIED ET AL: "Preparation of 2- phenylbenzimidazoles as poly(ADP-ribose) polymerase inhibitors." XP002520491 retrieved from STN Database accession no. 2000:314677 & WO 00/26192 A1 (BASF AKTIENGESELLSCHAFT, GERMANY) 11 May 2000 (2000-05-11) • DATABASECA[Online]CHEMICALABSTRACTS SERVICE, COLUMBUS, OHIO, US; GOEL, OM P.: "Trialkylsilyl esters of 6-(substituted amino) phenyl-1, dihydro-2-oxonicotinic acid and conversion to the corresponding acid chlorides" XP002520492 retrieved from STN Database accession no. 1976:543094 & US 3 951 982 A (GOEL, OM P.) 20 April 1976 (1976-04-20)

Remarks: Thefilecontainstechnicalinformationsubmittedafter the application was filed and not included in this specification

2 EP 1 669 350 B1

Description

TECHNICAL FIELD

5 [0001] The present invention relates to a novel piperidine derivative, to a histamine-H3 receptor antagonist containing the novel piperidine derivative as an active ingredient thereof, and to a preventive or remedy for metabolic system diseases, circulatory system diseases, central or peripheral nervous system diseases.

BACKGROUND ART 10 [0002] It has been known that, in organisms such as typically mammals, histamine that is a physiologically-active endogenous factor functions as a neurotransmitter and has extensive pharmacological activities (for example, see Life Science, 17,1975, 503 (1975)). Immunohistochemical studies have made it clear that a histamine-agonistic (producing) cell body exists in the nodal papillary nucleus in a posterior hypothalamic region and that histamine nerve fibers project 15 histamine in an extremely broad range in the brain, which supports various pharmacological effects of histamine (for example, see Journal of Comprehensive Neurology, 273, 283). The existence of histamine-agonistic nerves in the nodal papillary nucleus in a posterior hypothalamic region suggests that histamine may have an important role in control of physiological functions relating to brain functions, especially to hypothalamic functions (sleep, vigilance rhythm, incretion, eating and drinking action, sexual action, etc.) (for example, see Progress in Neurobiology, 63,637 (2001)). The existence 20 of histamine projection to the brain region that relates to vigilance sustenance, for example, to cerebral cortex suggests the role of histamine in control of vigilance or vigilance-sleep cycle. The existence of histamine projection to many peripheral structures such as hippocampus and amygdaloid complex suggests the role of histamine in control of auto- nomic nerves, emotion, control of motivated action and learning/memory process. [0003] On the other hand, when released from producing cells, histamine acts with a specific polymer that is referred 25 to as a receptor on the surface of a cell membrane or inside a target cell, therefore exhibiting its pharmacological effects for control of various body functions. Heretofore, four types of histamine receptors (H1 to H4) have been found In particular, the presence of a histamine receptor that participates in the central and peripheral nervous functions, a histamine-H3 receptor, has been shown by various pharmacological and physiological studies (for example, see Trends in Pharmacological Science, 8, 24 (1986)); and recently, human and rodent histamine-H3 receptor genes have been 30 identified and their existence has been made clear (for example, see Molecular Pharmacology, 55, 1101 (1999)). It is shown that a histamine-H3 receptor exists in the presynaptic membrane of central or peripheral neurocytes and functions as a self-receptor, therefore controlling the liberation of histamine and controlling the release of other neurotransmitters. Specifically, it is reported that a histamine-H3 receptor agonist, or its antagonist or inverse-agonist (generically referred to as antagonist) controls the release of histamine, noradrenaline, serotonin, acetylcholine or dopamine from nerve 35 ending For example, the release of these neurotransmitters is inhibited by an agonist such as (R)-(α)-methylhistamine, and the release of these neurotransmitters is promoted by an antagonist or inverse-agonist such as thioperamide (for example, see Trends in Pharmacological Science, 19,177 (1998)). Recent studies have shown that a histamine-H3 receptor has extremely high homeostatic activities (endogenous agonistic factor, e.g., activity observed in the absence of histamine) in the receptor-expressing cells/tissues or in a membrane fraction derived from the expressing cells/tissues 40 and even in living bodies (for example, see Nature, 408, 860). It is reported that these homeostatic activities are inhibited by an antagonist or an inverse-agonist. For example, a homeostatic self-receptor activity is inhibited by thioperamide or syproxyfan, and, as a result, the release of neurotransmitters from nerve ending, for example, the release and liberation of histamine from it is thereby promoted [0004] Various studies have been made for clarifying the effects of a histamine-H3 receptor. In animal experiments 45 with rats, a high-level selective inhibitor of histamine synthase (histidine decarboxylase) inhibits the vigilance of rats, which suggests that a histamine-H3 receptor may function for controlling motive vigilance. Administration of a histamine- H3 receptor agonist, (R)-(α)-methylhistamine to cats increases their deep slow-wave sleep (for example, see Brain Research, 523, 325 (1990)). Contrary to this, it has been clarified that a histamine-H3 receptor antagonist or inverse- agonist, thioperamide dose-dependently increases vigilance, and decreases slow-wave and REM sleep (see Science, 50 48,2397 (1991)). This suggests that a histamine-H3 receptor may participate in control of vigilance-sleep, and suggest a possibility that a selective histamine-H3 receptor agonist, or its antagonist or inverse-agonist may be useful for treatment of sleep disorders. Further, in animal experiments with rats, administration of histamine to the ventricle of rats inhibited their eating action, therefore suggesting that histamine may participate in control of eating action (for example, see Research, 793, 279 (1998)), and it has been clarified that thioperamide dose-dependently inhibits eating action and 55 promotes intracerebral histamine liberation (for example, see Life Science, 69, 469 (2001)). These informations suggest that a histamine-H3 receptor may participate in eating action control, further suggesting a possibility that an a histamine- H3 receptor antagonist or inverse-agonist may be useful for prevention or remedy of metabolic diseases such as eating disorder, obesity, diabetes, emaciation, hyperlipemia. In addition, in animal experiments with rats, it has been clarified

3 EP 1 669 350 B1

that administration of a histamine-H3 receptor agonist, (R)-(α)-methylhistamine to rats dose-dependently lowered their basal diastolic pressure, and its action was antagonized by a histamine-H3 receptor antagonist or inverse-agonist, thioperamide (for example, see Journal of Physiology and Pharmacology, 49, 191 (1998)). These informations suggest that a histamine-H3 receptor may participate in control of blood pressure, heart beat and cardiac output, further suggesting 5 a possibility that a histamine-H3 receptor agonist or its antagonist or inverse-agonist may be useful for prevention or remedy of circulatory system diseases such as hypertension and various cardiac disorders. [0005] Itisreportedthat,inanimalexperimentswithrats,administrationofahistamine-H3receptoragonist,(R)-(α)-methylhistamine to rats lowered their object recognition and learning effects in the object recognition test and the passive turnout test with them, while on the other hand, in the scopolamine-induced amnesia test with them, a histamine-H3 10 receptor antagonist or inverse-agonist, thioperamide dose-dependently relieved their amnesia induced by the chemical (for example, see Behavioural Brain Research, 104,147 (1999)). These informations suggest a possibility that a histamine-H3 receptor antagonist or inverse-agonist may be useful for prevention or remedy of various diseases accompanied by memory and learning disorder, for example, Alzheimer’s disease, Parkinson’s disease or attention deficit/hyperactivity disorder. Further, it has been clarified that, in animal experiments with rats, a histamine-H3 receptor antagonist or 15 inverse-agonist, thioperamide dose-dependently inhibited the spasm induced by electric shock or the epileptoid seizure induced by pentylene tetrazole (PTZ) (for example, see European Journal of Pharmacology, 234, 129 (1993) and Pharmacology. Biochemistry and Behavior, 68, 735 (2001)). These informations suggest a possibility that a histamine- H3 receptor antagonist or inverse-agonist may be useful for prevention or remedy of epilepsy or central spasm. In addition, a histamine-H3 receptor antagonist or inverse-agonist, thioperamide or GT-2331 reduces emotional cataplexy 20 and sleep of narcoleptic dogs (for example, see Brain Research, 793, 279 (1998)). [0006] These information suggest that an H3 receptor may participate in control of vigilance-sleep and sleep disorder- associated diseases, further suggesting a possibility that a selective histamine-H3 agonist or its antagonist or inverse- agonist may be useful for treatment of sleep disorders or various sleep disorder-associated diseases (for example, idiopathic hypersomnnia, repetitive hypersomnnia, true hypersomnnia, narcolepsy, sleep periodic acromotion disorder, 25 sleep apnea syndrome, circadian rhythm disorder, chronic fatigue syndrome, REM sleep disorder, senile insomnia, night worker sleep insanitation, idiopathic insomnia, repetitive insomnia, true insomnia, melancholia, schizophrenia). [0007] In animal experiments with rats, administration of a hisramine-H3 receptor antagonist or inverse-agonist, thioperamide or GT-2331 to rats relieved the condition of learning disorder (LD) and attention deficit hyperactivity disorder (ADHD) (for example, see Life Science, 69, 469 (2001)). 30 [0008] These informations suggest a possibility that a selective H3-agonist or its antagonist or inverse-agonist may be useful for remedy and/or prevention of learning disorder or attention deficit hyperactivity disorder. [0009] There are known a novel imidazole derivative (for example, see JP-T 10-501001) as a histamine-H3 receptor antagonist and/or agonist; 4-(4(5)-imidazolyl)butyramidine, 2-(4)-imidazolylethylisothiourea or an N-methyl derivative thereof having an antagonistic activity against a histamine-H3 receptor (for example, see JP-A-6-87742), or a migraine 35 remedy, a tranquilizer, a hypnotic, an anesthetic, a sedative, an anxiolytic, an antiasthmatic, an antibronchitic and an antiinflammatory agent that comprise N-methyl derivative thereof; and a histamine receptor antagonist useful for remedy of allergic rhinitis, inflammatory intestinal disorders, asthma, bronchitis and vomition that comprises an N-methyl-N-(4- piperidin-1-yl)-2-arylbutyl)benzamide (for example, see JP-T-2002-504082). WO 02/076925 discloses aminoalkylphe- nylethers as H3 receptor antagonists. 40 However, no one knows that a piperidine derivative having a skeleton with a nitrogen-containing cyclo-ring and a specific nitrogen-containing heteroaryl ring or phenyl group bonding to piperidine could be a histamine-H3 antagonist, and no one also knows that the piperidine derivative could be effective for metabolic system diseases, circulatory system diseases, central or peripheral nervous system diseases, and especially effective for relieving obesity.

45 DISCLOSURE OF THE INVENTION

PROBLEMS THAT THE INVENTION IS TO SOLVE

[0010] An object of the invention is to provide a novel piperidine derivative, and a histamine-H3 receptor antagonist 50 comprising it, and to provide a preventive or remedy for metabolic system diseases, circulatory system diseases, central or peripheral nervous system diseases, which is especially effective for obesity and has few side effects. [0011] We, the present inventors have assiduously studied on the assumption that a piperidine derivative may have an antagonistic effect or an adverse effect against a histamine-H3 receptor and could be a histamine-H3 receptor antagonist, and, as a result, have found that a specific piperidine derivative having a skeleton with a specific nitrogen- 55 containing cyclo-ring and a specific nitrogen-containing heteroaryl ring or phenyl group bonding to the piperidine ring thereof are effective for relieving metabolic system diseases, circulatory system diseases, central or peripheral nervous system diseases, and have completed the invention [0012] Specifically, the invention relates to a compound of a general formula (I):

4 EP 1 669 350 B1

wherein:

15 X1 and X2 independently represent a nitrogen atom or CH;

3 X represents-Os-(CH2)m-, wherein s indicates 0 or 1, and m indicates an integer to make (m+s)=0 or 1 to 4;

1 2 R and R independently represent a hydrogen atom, a halogen atom, a linear or branched C16 alkyl group, a C16 20 alkoxy group, or an acetyl group substituted with 2 or 3 fluorine atoms;

Y is selected from the group consisting of :

(1) a group of the formula (IV): 25

35 wherein:

3 R is a hydrogen atom, or a C1-6 alkyl group, and R4 is a group of the formula (V): 40

50 5 wherein R represents a hydrogen atom, a C1-6 alkyl group, C3 to C8 cycloalkyl group, an aralkyl group, or a heteroaryl group; n indicates 0 or an integer from 1 to 4;

(2) a group of the formula (IV): 55

5 EP 1 669 350 B1

10 3 wherein R is a hydrogen atom, or a C1-6alkyl group, and R4 is a group of the formula (VI):

-(CH2)q-A (VI) 15 wherein A represents an aryl group, a heteroaryl group, a condensed bicyclic group of a C4 to C7 cycloalkyl group and an aryl group, or a condensed bicyclic group of a C4 to C7 cycloalkyl group and heteroaryl group; q indicates an integer from to 3;to 3; and

20 (3) a group of the formula (IV):

wherein R3 and R4 form a nitrogen containing heterocyclic group selected from:piperidinyl, pyrrolidinyl, azetidinyl and homopiperidinyl, any of which is optionally condensed with a phenyl or pyridyl group to form a bicyclic group; or a pharmaceutically-acceptable salt thereof, 35 [0013] The invention also relates to the compound or its pharmaceutically-acceptable salt of formula (I) wherein R1 and R2 are hydrogen atoms, m in X3 is an integer of from 1 to 3, and s is 0 (claim 2). [0014] The invention also relates to the compound or its pharmaceutically-acceptable salt of formula (I) wherein X1 2 and X are both CH2, or one of them is a nitrogen atom; or relates to the compound or its pharmaceutically-acceptable 40 salt of formula (I), wherein the piperidine derivative compound of formula (I) is any of the following:

N-methyl-N-(1-methylpiperidin-4-yl)-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide (1), N-(1-methylpiperidin-4-yl)-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide (2), N-methyl-N-(1-cyclobutylpiperidin-4-yl)-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide (3), 45 N-methyl-N-(1-cyclopentylpiperidin-4-yl)-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide (4), N-methyl-N-(1-cyclohexylpiperidin-4-yl)-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide (5), N-methyl-N-(1-cyclohexylmethylpiperidin-4-yl)-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide (6), N-mediyl-N-[(3R)-1-cyclopentylpyrrolidin-3-yl]4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide (7), N-methyl-N-[(3S)-1-cyclopentylpyrrolidin-3-yl)]-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide (8), 50 N-methyl-N-[(3R)-1-benzylpyrrolidin-3-yl)]-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide (9), N-methyl-N-[(3R)-1-benzylpyrrolidin-3-yl)]-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide (10), N-(pyridin-4-yl)4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide trifluoroacetate (11), 2-{4-(piperidin-1-yl)piperidin-1-yl]benzoyl-1,2,3,4-tetrahydroisoquinoline (12), 1-{4-(piperidin-1-yl)piperidin-1-yl]benzoyl-1,2,3,4-tetrahyroquinoline (13), 55 1-{4-(piperidin-1-yl)piperidin-1-yl]benzoyl-4-phenylpiperazine (14), N-methyl-N-[1-(pyrimidin-2-yl)piperidin-4-yl]-4-[ 4-(piperidin-1-yl)piperidin-1-yl]benzamide (15), N-methyl-N(thiophen-2-yl)methyl-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide (16), N-methyl-N-phenethyl-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide (17),

6 EP 1 669 350 B1

1-{4-(piperidin-1-yl)piperidin-1-yl]benzoyl-3-(3,4-difluorophenyl)pyrrolidine (18), 4-{4-(piperidin-1-yl)piperidin-1-yl]benzoylpiperidin-1-yl (19), N-methyl-N-(1-methylpiperidin-4-yl)-4-[4-(pyrrolidin-l-yl)piperidin-1-yl]benzamide (20), N-methyl-N-(1-methylpiperidin-4-yl)-4-[4-(azetidin-1-yl)piperidin-1-yl]benzamide (21), 5 N-methyl-N-(1-methylpiperidin-4-yl)-5-[4-(piperidin-1-yl)piperidin-1-yl]pyridine-2-carboxamide (22), or N-methyl-N-(1-methylpiperidin-4-yl)-4-[4-(4,4-difluoropiperidin-1-yl)piperidin-1-yl]benzamide (23).

[0015] The invention also relates to a histamine-H3 antagonist or inverse-agonist containing, as the active ingredient thereof, a compound or its pharmaceutically-acceptable salt of formula (I); or relates to a preventive or remedy containing, 10 as the active ingredient thereof, a compound or its pharmaceutically-acceptable salt of formula (I), which is for metabolic system diseases such as obesity, diabetes, hormone secretion disorder, hyperlipemia, gout, fatty liver, circulatory system diseases, for example, stenocardia, acute/congestive cardiac insufficiency, cardiac infarction, coronary arteriosclerosis, hypertension, nephropathy, sleep disorder and various diseases accompanied by sleep disorder such as idiopathic hypersomnnia, repetitive hypersomnnia, true hypersomnnia, narcolepsy, sleep periodic acromotion disorder, sleep ap- 15 nea syndrome, circadian rhythm disorder, chronic fatigue syndrome, REM sleep disorder, senile insomnia, night worker sleep insanitation, idiopathic insomnia, repetitive insomnia, true insomnia, electrolyte metabolism disorder, and central and peripheral nervous system diseases such as bulimia, emotional disorder, melancholia, anxiety, epilepsy, delirium, dementia, shinzophrenia, attention deficit/hyperactivity disorder, memory disorder, Alzheimer’s disease, Parkinson’s disease, sleep disorder, recognition disorder, motion disorder, paresthesia, dysosmia, epilepsy, morphine resistance, 20 narcotic dependency, alcoholic dependency.

BEST MODE FOR CARRYING OUT THE INVENTION

[0016] Unless otherwise specifically indicated, the group as referred to in this description concretely includes those 25 mentioned below. [0017] "Halogen atom" includes, for example, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom [0018] "Lower alkyl group" may be a linear or branched C1 to C6 alkyl group, including, for example, a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, a pentyl group, an isoamyl group, a neopentyl group, an isopentyl group, a 1,1-dimethylpropyl group, a 1-methylbutyl 30 group, a 2-methylbutyl group, a 1,2-dimethylpropyl group, a hexyl group, an isohexyl group, a 1-methylpentyl group, a 2-methylpentyl group, a 3-methylpentyl group, a 1,1 -dimethylbutyl group, a 1,2-dimethylbutyl group, a 2,2-dimethylbutyl group, a 1,3-dimethylbutyl group, a 2,3-dimethylbutyl group, a 3,3-dimethylbutyl group, a 1-ethylbutyl group, a 2-ethylbutyl group, a 1,2,2-trimethylpropyl group, a 1-ethyl-2-methylpropyl group. [0019] "Lower alkoxy group" means a hydroxyl group of which the hydrogen atom is substituted with the above- 35 mentioned lower alkyl group, including, for example, a methoxy group, an ethoxy group, a propoxy group, an isopropoxy group, a butoxy group, a sec-butoxy group, a tert-butoxy group, a pentyloxy group, an isopentyloxy group, a hexyloxy group, an isohexyloxy group. [0020] "C3 to C9 cycloalkyl group" includes, for example, a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, a cyclononyl group. 40 [0021] "Aryl goup" includes, for example, a phenyl group, a 1-naphthyl group, a 2-naphthyl group. [0022] "aralkyl group" may be the above-mentioned lower alkyl group having the above-mentioned aryl group, including, for example, a benzyl group, a 1-phenylethyl group, a 2-phenylethyl group, a 1-naphthylmethyl group, a 2-naphthylmethyl group. [0023] "Heteroaryl group" means a 5- or 6-membered monocyclic heteroaryl group having therein from 1 to 3 hetero 45 atoms selected from an oxygen atom, a sulfur atom and a nitrogen atom, including for example, a 5-membered cyclic group such as a 2-furyl group, a 3-furyl group, a 2-thienyl group, a 3-thienyl group, a 1-pyrrolyl group, a 2-pyrrolyl group, a 3-pyrrolyl group, a 1-imidazolyl group, a 2-imidazolyl group, a 4-imidazolyl group, a 1-pyrazolyl group, a 3-pyrazolyl group, a 4-pyrazolyl group, a 1-(1,2,4-triazolyl) group, a 3-(1,2,4-triazolyl) group, a 1-(1,2,3-triazolyl) group, a 4-(1,2,3- triazolyl) group, a 2-thiazolyl group, a 4-thiazolyl group, a 5-thiazolyl group, a 4-(1,2,3-thiadiazolyl) group, a 3-(1,2,4- 50 thiadiazolyl) group, a 2-(1,3,4-thiadiazolyl) group, a 3-isothiazolyl group, a 4-isothiazolyl group, a 2-oxazolyl group, a 4- oxazolyl group, a 5-oxazolyl group, a 3-isoxazolyl group, a 4-isoxazolyl group; and a 6-membered cyclic group such as a 2-pyridyl group, a 3-pyridyl group, a 4-pyridyl group, a 2-pyrimidinyl group, a 4-pyrimidinyl group, a 5-pyrimidinyl group, a 3-pyndazinyl group, a 4-pyridazinyl group, a 5-pyndazinyl group, a 2-pyrazinyl group. [0024] The novel piperidine derivatives of the invention are represented by the following general formula (I): 55

7 EP 1 669 350 B1

in which a predetermined nitrogen-containing heterocyclic group bonds to the 4-position of the piperidine ring and a predetermined aromatic ring bonds to the 1-position of the piperidine ring. Not specifically defined, the novel piperidine derivatives of the invention includes those as above and their pharmaceutically-acceptable salts. 15 [0025] In formula (I), X3 in the nitrogen-containing heterocyclic group that bonds to the 4-position of the piperidine ring indicates Os-(CH2)m, s indicates 0 or 1; m indicates an integer to make (m + s) 0 or from 1 to 4. The nitrogen- containing heterocyclic group may be a 4-membered to 8-membered group, concretely including a 1-azetidinyl group, a 1-pyrrolidinyl group, a piperidino group, a 1-hexamethyleneiminyl group, a 1-heptamethyleneiminyl group, a morpholino group. Of those, preferred are a 1-pyrrolidinyl group, a piperidino group, a 1-hexamethyleneiminyl group; and more 20 preferred is a piperidino group. [0026] R1 and R2 in the nitrogen-containing heterocyclic group are independently a hydrogen atom, a halogen atom, a linear or branched lower alkyl group, a lower alkoxy group, or an acetyl group substituted with 2 or 3 fluorine atoms. The halogen atom, the linear or branched lower alkyl group and the lower alkoxy group for R1 and R2 are concretely those mentioned hereinabove. The acetyl group substituted with 2 or 3 fluorine atoms for R1 and R2 includes, for example, 25 a perfluoroacetyl group, a difluoroacetyl group. Of those substituents, R1 and R2 are preferably hydrogen atoms. [0027] In formula (I), X1 and X2 in the aromatic ring bonding to the 1-position of the piperidin ring independently represent a nitrogen atom or CH. As so mentioned hereinunder, their preferred combinations may be selected depending on the hydrogen atom or the substituent Y bonding to the aromatic ring. [0028] In formula (I), the substituent Y of the aromatic ring bonding to the 1-position of the piperidine ring is a group 30 of the following general formula (IV):

Y of formula (IV) includes the following 4 embodiments. [0029] The first embodiment is as follows: In formula (IV), R3 represents a hydrogen atom or a lower alkyl group, and R4 represents a group of the following general formula (V): 45

55 (wherein R5 represents a hydrogen atom, a lower alkyl group, a C3 to C8 cycloalkyl group, an aralkyl group or a heteroaryl group; n indicates 0 or an integer of from 1 to 4). In formula (IV), the alkyl group for R3 concretely includes a methyl group, an ethyl group. The group for R3 is preferably a methyl group, a hydrogen atom or an ethyl group in that order. The lower alkyl group for R5 in formula (V) that represents R4 includes a methyl group, an ethyl group. The

8 EP 1 669 350 B1

aralkyl group concretely includes the same as those mentioned hereinabove. The C3 to C8 cycloalkyl group may be the same as those mentioned hereinabove for the above-mentioned C3 to C9 cycloalkyl group, but excepting a cyclononyl group. The heteroaryl group may be a 5-membered or 6-membered monocyclic heteroaryl group having a hetero atom selected from the group consisting of an oxygen atom, a sulfur atom and a nitrogen atom, and it may 5 include the same as those mentioned hereinabove for the above-mentioned heteroaryl group. [0030] The second embodiment is as follows: In formula (IV), R3 represents a hydrogen atom or a lower alkyl group, R4 represents a group of the following general formula (VI):

-(CH2)q-A (VI) 10 (wherein A represents an aryl group, a heteroaryl group, a condensed bicyclic group of a C4 to C7 cycloalkyl group and an aryl group, or a condensed bicyclic group of a C4 to C7 cycloalkyl group and a heteroaryl group; q indicates an integer of from 1 to 3). In formula (IV), the lower alkyl group for R3 concretely includes a methyl group, an ethyl group. The aryl group and the heteroaryl group for A in formula (VI) that represents R3 concretely includes the same as those mentioned 15 hereinabove. The C4 to C7 cycloalkyl group concretely includes a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group. [0031] The third embodiment is as follows: In formula (IV), R3 and R4 form a nitrogen-containing heterocyclic group along with the nitrogen atom bonding to them. The nitrogen-containing heterocyclic group may be a monocyclic group, including, for example, a piperidinyl group, a pyrrolidinyl group, an azetidinyl group, a homopiperidinyl group, a heptam- 20 ethyleneiminyl group. [0032] The fourth embodiment is as follows: The nitrogen-containing heterocyclic group in the third embodiment is condensed with a phenyl group or a pyridyl group to form a bicyclic group. The bicyclic group may include the same as those mentioned hereinabove for the above-mentioned heterocyclic group. [0033] When Y in formula (I) indicates any of the above-mentioned for 4 embodiments, then the aromatic ring in 25 formula (I) to which Y bonds is preferably a phenyl group where X1 and X2 are both CH; or a pyridyl group where any of them is a nitrogen atom [0034] Concretely, the piperidine derivatives of formula (I) include compounds listed in Table 1.

9 EP 1 669 350 B1

10 11 H 5 13 H C 5 6 5 R H 2 -C

15 7 )C H 3 3 )HC 3 -C(CH 9 H 4

20 -C(CH 5 -C 7 H 2 H 3 )C 3 -C 5 H 2 -C CH(CH

25 3 2 H CH C 4 R 30 [Table 1] 3 5 3 R H 2

35 H -C - 2 F H -CH R

40 3 3 1 H 3 R -CH -COCH -OCF 45 3 X

50 2 X

55 1 NF X CH CH

10 EP 1 669 350 B1

10 5 A R 15

25 4 4 H R R 30 (continued) 3 3 5 3 R R H 2

35 H -C 2 2 R R

40 3 1 1 3 3 R R -COCH -OFF -CH 45 3 3 X X

50 2 2 X X

55 1 1 NFF- NFF- X X CH CH H H -CH

11 EP 1 669 350 B1

10 A

25 4 R 30 (continued) 3 R 35 2 R

40 1 R

45 3 X

50 2 X

55 1 X

12 EP 1 669 350 B1

[0035] Of those piperidine derivatives, preferred are the following:

N-methyl-N-(1-methylpiperidin-4-yl)-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide (1), N-(1-methylperidin-4-yl)-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide (2), 5 N-methyl-N-(1-cyclobutylpiperidin-4-yl)-4-[4-(piperiding-1-yl)piperidin-1-yl]benzamide (3), N-methyl-N-(1-cyclopentylpiperidin-4-yl)-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide (4), N-methyl-N-(1-cyclohexylpiperidin-4-yl)-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide (5), N-methyl-N-(1-cyclohexylmethylpiperidin4-yl)-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide (6), N-methyl-N-[(3R)-1-cyclopentylpyrrolidin-3-yl]-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide (7), 10 N-methyl-N-[(3S)-1-cyclopentylpyrrolidin-3-yl)]-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide (8), N-methyl-N-[(3R)-1-benzylpyrrolidin-3-yl)]-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide (9), N-methyl-N-[(3R)-1-benzylpyrrolidin-3-yl)]-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide (10), N-(pyridin-4-yl)-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide (11), 2-{4-(4-piperidin-1-yl)piperidin-1-yl]benzoyl-1,2,3,4-tetrahydroisoquinoline (12), 15 1-{4-(4-pipendin-1-yl)piperidin-1-yl]benzoyl-1,2,3,4-tetrahydroquinoline (13), 1-{4-(4-piperidin-1-yl)pipendin-1-yl]benzoyl-4-phenylpiperazine (14), N-methyl-N-[1-(pyrimidin-2-yl)piperidin-4-yl]-[4-(piperidin-1-yl)piperidin-yl]benzamide (15), N-methyl-N-thiophen-2-yl)methyl-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide (16), N-methyl-N-phenethyl-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide (17), 20 1-{4-(4-piperidin-1-yl)piperidin-1-yl]benzoyl-3-(3,4-difluorophenyl)pyrrolidine (18), 1-{4-(4-piperidin-1-yl)piperidin-1-yl]benzoylpiperidin (19), N-methyl-N-(1-methylpiperidin-4-yl)-4-[4-(pyrrolidin-1-yl)piperidin-1-yl]benzamide (20).

[0036] Also preferably, the piperidine derivatives of the invention are the following: 25 N-methyl-N-(1-methylpiperidin-4-yl)-4-[4-(azetidin-1-yl)piperidin-1-yl]benzamide (21), N-methyl-N-(1-methylpiperidin-4-yl)-5-[4-(piperidin-1-yl)piperidin-1-yl]pyridine-2-carboxamide (22), N-methyl-N-(1-methylpiperidin-4-yl)-4-[4-(4,4-difluoropiperidin-1-yl)piperidin-1-yl]benzamide (23),

30 [0037] Not specifically defined, pharmaceutically-acceptable salts of piperidine derivatives of formula (I) are, for example, hydrohalides such as hydrofluorides, hydrobromides, hydroiodides; inorganic acid salts such as nitrates, per- chlorates, sulfates, phosphates, carbonates; lower alkylsulfonates such as methanesulfonates, trifluoromethanesul- fonates, ethanesulfonates; arylsulfonates such as benzenesulfonates, p-toluenesulfonates; organic acid salts such as furnarates, succinates, citrates, tartrates, oxalates, maleates; and other acid-addition salts with organic acids such as 35 amino acids, for example, glutamates, aspartates. The salts may also be base-addition salts, for example, salts with alkali metals such as sodium, potassium; salts with alkaline earth metals such as calcium, magnesium; ammonium salts; salts with organic bases such as guanidine, triethylamine, dicyclohexylamine. Further, the piperidine derivatives of formula (I) of the invention may be in the form of hydrates or solvates of their free compounds or pharmaceutically- acceptable salts. 40 [0038] Methods for producing the piperidine derivatives of formula (I) of the invention are described below. The piperidine derivatives of formula (I) may be produced, using any known reaction methods or according to any per-se known methods. They may be produced not only according to ordinary liquid-phase production methods but also according to any solid-phase methods such as combinatorial production methods or parallel production methods that are being significantly developed these days. 45 [0039] Methods for producing the piperidine derivatives of formula (I) of the invention are described below.

[Production Method 1]

[0040] A compound of a general formula (Ia): 50

13 EP 1 669 350 B1

[wherein X1,X2,X3,R1 and R2 have the same meanings as X1,X2,X3,R1 and R2 in formula (I); and L1 represents a 15 leaving group] is reacted with a compound of a general formula (IIa):

Met - Y1p (IIa)

[wherein Met represents a metal atom-containing atomic group; and Y1p has the same meaning as Y in general formula 20 (I):

or represents a group corresponding to it but protected at the amino group, the hydroxyl group or the carboxyl group therein], in the presence of a catalyst to give a compound of a general formula (Ib):

[wherein X1,X2,X3,R1 and R2 have the same meanings as X1,X2,X3,R1 and R2 in formula (Ia); and Y1p has the same meaning as Y1p in formula (IIa)], and optionally the protective group for the functional group of Y1p is removed or converted (e.g., for amine residue acylation, carboxylic acid residue amidation, alcohol residue alkylation) to thereby 40 produce a compound of a general formula (I-1):

55 [wherein X1,X2,X3,R1 and R2 have the same meanings as X1,X2,X3,R1 and R2 in formula (Ib); and Y is a group derived from Y1p in formula (Ib) by removing or converting the protective group for the functional group of Y1p]. [0041] The metal atom-containing atomic group for Met in formula (IIa) is preferably an organic metal-containing atomic group generally used in cross-coupling reaction. The metal atom to be in the metal atom-containing atomic group

14 EP 1 669 350 B1

includes, for example, lithium, boron, silicon, magnesium, aluminium, zinc, tin, more preferably boron, zinc, tin. Regarding the concrete embodiments of the metal atom-containing atomic group, for example, boron is in the form of boric acid or borates; zinc is in the form of zinc chloride, zinc bromide or zinc iodide; and tin is in the form of tri-lower alkyl-tin. Y1p in formula (IIa) that contains a protective group for Y is described hereinunder. 5 [0042] The reaction of producing a compound of formula (Ib) from a compound of formula (Ia) and a compound of formula (IIa) is carried out, generally using from 0.5 mols to 5 mols, preferably from 0.7 mols to 3 mols of the compound (IIa) relative to 1 mol of the compound (Ia). The catalyst for the reaction is, for example, a transition metal generally used in cross-coupling reaction, such as copper, nickel, palladium. More concretely, preferred are tetrakis(triphenylphosphine)palladium(0), palladium(II) acetate, bis(triphenylphosphine)palladium(II) chloride, [1,1’-bis(diphenylphosphi- 10 no)ferrocene]palladium(II)dichloride. The reaction is effected generally in an inert solvent The insert solvent is, for example, preferably water, benzene, toluene, xylene, methylene chloride, chloroform, dimethoxyethane, tetrahydrofuran, dioxane, dimethylformamide, and their mixed solvents. The reaction temperature may be generally from room temperature to the boiling point of the solvent used in the reaction, preferably from 20˚C to 200˚C. The reaction time may be generally from 30 minutes to 7 days, preferably from 3 hours to 2 days. 15 [0043] Preferably, the reaction of a compound of formula (Ia) and a compound of formula (IIa) is effected in the presence of a base. The base includes, for example, an inorganic base such as sodium hydroxide, potassium hydroxide, sodium hydrogencarbonate, sodium carbonate, potassium carbonate, cesium carbonate; and an organic base such as triethylamine, diisopropylamine. The amount of the base to be used may be generally from 0.5 mols to 5 mols, preferably from 0.7 mols to 3 mols relative to 1 mol of the compound of formula (Ia). 20 [0044] In the reaction of a compound of formula (Ia) and a compound of formula (IIa), the amino group, the imino group, the hydroxyl group, the carboxyl group, the oxo group or the carbonyl group in the compound of formula (Ia) or in Y1p in formula (IIa) may be protected with a protective group, and then the reaction may be effected, and, after the reaction, the protective group may be removed The protective group for such an amino group or an imino group may be any one having its own function, including, for example, an aralkyl group such as a benzyl group, a p-methoxybemyl 25 group, a 3,4-dimethoxybenzyl group, an o-nitrobenzyl group, a p-nitrobenzyl group, a benzhydryl group, a trityl group; a lower alkanoyl group such as a formyl group, an acetyl group, a propionyl group, a butyryl group, a pivaloyl group; a benzoyl group; an arylalkanoyl group such as a phenylacetyl group, a phenoxyacetyl group; a lower alkoxycarbonyl group such as a methoxycarbonyl group, an ethoxycarbonyl group, a propyloxycarbonyl group, a tert-butoxycarbonyl group; an aralkyloxycarbonyl group such as a benzyloxycarbonyl group, a p-nitrobenzyloxycarbonyl group, a phenethy- 30 loxycarbonyl group; a lower alkylsilyl group such as a trimethylsilyl group, a tert-butyldimethylsilyl group; a tetrahydropyranyl group; a trimethylsilylethoxymethyl group; a lower alkylsulfonyl group such as a methylsulfonyl group, an ethyl- sulfonyl group; an arylsulfonyl group such as a benzenesulfonyl group, a toluenesulfonyl group. Preferred particularly are an acetyl group, a benzoyl goup, a tert-butoxycarbonyl group, a trimethylsilylethoxymethyl group, a methylsulfonyl group and the like. 35 [0045] The protective group for the hydroxyl group not participating in the reaction, in the compound of formula (Ia) or in Y1p in formula (IIa), may be any one having its own function. For example, it includes a lower alkyl group such as a methyl group, an ethyl group, a propyl group, an isopropyl group, a tert-butyl group; a lower alkylsilyl group such as a trimethylsilyl group, a tert-butyldimethylsilyl group; a lower alkoxymethyl group such as a methoxymethyl group, a 2- methoxyethoxymethyl group; a tetrahydropyranyl group; a trimethylsilylethoxymethyl group; an aralkyl group such as a 40 benzyl group, a p-methoxybenzyl group, a 2,3-dimethoxybenzyl group, an o-nitrobenzyl group, a p-nitrobenzyl group, a trityl group; an acyl group such as a formyl group, an acetyl group. Preferred particularly are a methyl group, a methoxymethyl group, a tetrahydropyranyl group, a trityl group, a trimethylsilylethoxymethyl group, a tert-butyldimethylsilyl group, an acetyl group and the like. [0046] The protective group for the carboxyl group not participating in the reaction, in the compound of formula (Ia) 45 or in Y1p in formula (IIa), may be any one having its own function For example, it includes a lower alkyl group such as a methyl group, an ethyl group, a propyl group, an isopropyl group, a tert-butyl group; a halo-lower alkyl group such as a 2,2,2-trichloroethyl group; a lower alkenyl group such as a 2-propenyl group; an aralkyl group such as a benzyl group, a p-methoxybenzyl group, a p-nitrobenzyl group, a benzhydryl group, a trityl group. Preferred particularly are a methyl group, an ethyl group, a tert-butyl group, a 2-propenyl group, a benzyl group, a p-methoxybenzyl group, a benzhydryl 50 group and the like. [0047] The protective group for the oxo group or the carbonyl group not participating in the reaction, in the compound of formula (Ia) or in Y1p in formula (IIa), may be any one having its own function. For example, it includes acetals and ketals such as ethylene ketal, trimethylene ketal, dimethyl ketal [0048] The compound of formula (Ib) thus obtained in the manner as above is, after purified or not purified, subjected 55 to removal or conversion of the protective group when Y1p in the formula has a protected amino group, hydroxyl group, carboxyl group, oxo group or carbonyl group, whereby the intended compound of formula (I-1) may be produced. The removal of the protective group may differ, depending on the type of the protective group and on the stability of the intended product compound (I-1). For example, it may be attained through solvolysis with an acid or a base according

15 EP 1 669 350 B1

to methods described in references (see Protective Groups in Organic Synthesis written T. W. Green; published by John Wiley & Sons,1981) or according to methods similar to these, for example, according to a method of reacting the product with from 0.01 mol to a large excessive amount of an acid, preferably trifluoroacetic acid, formic acid or hydrochloric acid, or with an equimolar amount or a large excessive amount of a base, preferably potassium hydroxide or calcium 5 hydroxide, or through chemical reduction with a metal hydride complex, or through catalytic reduction with a palladium- carbon catalyst or a Raney nickel catalyst or the like.

[Production Method 2]

10 [0049] A compound of a general formula (Ic):

[wherein X1 and X2 have the same meanings as X1 and X2 in formula (I); Y1p has the same meaning as Y in general formula (I), or represents a group corresponding to it but protected at the amino group, the hydroxyl group or the carboxyl group therein; and L2 represents a leaving group] is reacted with a compound of a formula (Id): 25

35 [wherein R1,R2 and X3 have the same meaning as R1,R2 and X3 in formula (I)] under a basic condition or in the presence of a catalyst to give a compound of a general formula (Ie):

50 [wherein X1,X2 and Y1p have the same meanings as X1,X2 and Y1p in formula (Ic); X3,R1 and R2 have the same meanings as X3,R1 and R2 in formula (Id)], and optionally the protective group for the functional group of Y1p is removed or converted (e.g., for amine residue acylation, carboxylic acid residue amidation, alcohol residue alkylation) to thereby produce a compound of a general formula (I-2):

16 EP 1 669 350 B1

[wherein X1,X2,X3,R1 and R2 have the same meanings as X1,X2,X3,R1 and R2 in formula (Ie); and Y is a group derived from Y1p in formula (Ie) by removing or converting the protective group for the functional group of Y1p]. 15 [0050] The introduction of a protective group to the functional group not participating in the reaction in the compounds or in Y1p, as well as the removal and the conversion of the protective group after the reaction, and the treatment after the reaction may be attained according to the methods described for the Production Method 1.

[Production Method 3] 20 [0051] A compound of a general formula (If):

35 [wherein X1,X2,X3,R1 and R2 have the same meanings as X1,X2,X3,R1 and R2 in formula (I); Met represents a metal atom-containing atomic group] is reacted with a compound of a general formula (IIb):

y1p - L2 (IIb)

40 [wherein Y1p has the same meaning as Y in formula (I), or represents a group corresponding to it but protected at the amino group, the hydroxyl group or the carboxyl group therein; and L2 represents an ordinary leaving group], in the presence of a catalyst to give a compound of a general formula (Ig):

55 [wherein X1,X2,X3,R1 and R2 have the same meanings as X1,X2,X3,R1 and R2 in formula (If); and Y1p has the same meaning as Y1p in formula (IIb)], and optionally the protective group for the functional group of Y1p is removed or converted (e.g., for amine residue acylation, carboxylic acid residue amidation, alcohol residue alkylation) to thereby

17 EP 1 669 350 B1

produce a compound of a general formula (I-3):

15 [wherein X1,X2,X3,R1 and R2 have the same meanings as X1,X2,X3,R1 and R2 in formula (Ig); and Y is a group derived from Y1p in formula (Ig) by removing or converting the protective group for the functional group of Y1p]. [0052] The starting substances, compounds of formula (Ia) and (IIa), as well as compounds of formula (Ic) and (Id), and compounds of formula (IIb) that are used in the above-mentioned production methods may be prepared in known methods or according to such known methods, or according to the methods described in Examples and Reference 20 Examples herein, optionally by suitably combining them. [0053] The compounds of formula (If) that are the starting substance for use in the above-mentioned production methods may be prepared as follows:

1) Reaction of a compound of formula (Ia) with a lower alkyl metal, 25 2) Reaction of a compound of formula (Ia) with a lower alkyl metal followed by further reaction of the intermediate with a metal halide or an ester, 3) Reaction of a compound of formula (Ia) with, for example, a bis(tri-lower alkyl tin) or bis(boronate) in the presence of a catalyst.

30 [0054] The compounds of formula (Ib), (I-1), (Ie), (I-2), (Ig) or (I-3) produced in the above-mentioned production methods may be readily isolated and purified in any ordinary separation method The method includes, for example, solvent extraction, recrystallization, column chromatography, preparative thin-layer chromatography. [0055] Pharmaceutically-acceptable salts of the piperidine derivatives of formula (I) may be produced by a method of adding an acid or a base to the piperidine derivative obtained in any of the above-mentioned methods. For producing 35 acid-addition salts of the piperidine derivative, for example, a hydrohalic acid such as hydrochloric acid, hydrofluoric acid, hydrobromic acid or hydroiodic acid, or an inorganic acid such as nitric acid, perchloric acid, sulfuric acid, phosphoric acid or carbonic acid, or a lower alkylsulfonic acid such as methanesulfonic acid, trifluoromethanesulfonic acid or ethanesulfonic acid, or an arylsulfonic acid such as benzenesulfonic acid or p-toluenesulfonic acid, or an organic acid such as fumaric acid, succinic acid, citric acid, tartaric acid, oxalic acid, maleic acid, or any other organic acid such as 40 an amino acid, e.g., glutamic acid or aspartic acid may be added to the piperidine derivative. For producing acid-addition salts of the piperidine derivative, for example, an alkali metal salt with sodium or potassium, or an alkaline earth metal salt with calcium or magnesium, or an ammonium salt, or an organic base such as guanidine, triethylamine or dicyclohexylamine may be added to the piperidine derivative. [0056] The piperidine derivative of formula (I) or its pharmaceutically-acceptable salt significantly inhibits histamine- 45 H3 receptor-expressing cells from bonding to Nα-methylhistamine (histamine analogue), and therefore effectively acts as a histamine-H3 receptor antagonist or inverse-agonist. In addition, it significantly detracts from the in-vitro action of R-α-methylhistamine (selective agonist). [0057] Not specifically defined, the histamine-H3 receptor antagonist or inverse-agonist of the invention may comprise, as the active ingredient thereof, a piperidine derivative of formula (I) or its pharmaceutically-acceptable salt, and its 50 administration route may be either orally or parenterally. It may be formulated into a preparation suitable for its administration, and may be administered. The histamine-H3 receptor antagonist or inverse-agonist is effective, for example, for metabolic system diseases such as obesity, diabetes, hormone secretion disorder, hyperlipemia, gout, fatty liver, circulatory system diseases such as stenocardia, acute/congestive cardiac insufficiency, cardiac infarction, coronary arteriosclerosis, hypertension, nephropathy, electrolyte metabolism disorder, and central and peripheral nervous system 55 diseases such as bulimia, emotional disorder, melancholia, anxiety, epilepsy, delirium, dementia, shinzophrenia, attention deficit/hyperactivity disorder, memory disorder, Alzheimer’s disease, Parkinson’s disease, sleep disorder, recognition disorder, motion disorder, paresthesia, dysosmia, epilepsy, morphine resistance, narcotic dependency, alcoholic dependency.

18 EP 1 669 350 B1

[0058] In clinical use of the piperidine derivatives of formula (I) or their pharmaceutically-acceptable salts of the invention, pharmaceutically-acceptable additives may be added thereto to formulate various preparations in accordance with the intended administration route thereof, and the preparations may be administered Various additives generally used in the field of pharmaceutical compositions may be used herein, including, for example, gelatin, lactose, white 5 sugar, titanium oxide, starch, crystalline cellulose, hydroxypropylmethyl cellulose, carboxymethyl cellulose, com starch, microcrystalline wax, white petrolatum, magnesium metasilicate aluminate, anhydrous calcium phosphate, citric acid, trisodium citrate, hydroxypropyl cellulose, sorbitol, sorbitan fatty acid ester, polysorbate, sucrose fatty acid ester, poly- oxyethylene, hardened castor oil, polyvinylpyrrolidone, magnesium stearate, light silicic acid anhydride, talc, vegetable oil, benzyl alcohol, gum arabic, propylene glycol, polyalkylene glycol, cyclodextrin, and hydroxypropylcyclodextrin. 10 [0059] Combined with such additives, the compound of the invention may be formulated into various forms of preparations, for example, solid preparations such as tablets, capsules, granules, powders and suppositories; and liquid preparations such as syrups, elixirs and injections. These preparations can be produced in any method known in the filed of pharmaceutical compositions. The liquid preparations may be in such a form that is dissolved or suspended in water or in any other suitable medium before use. Especially for injections, the preparation may be dissolved or sus- 15 pended, if desired, in a physiological saline or glucose solution, and a buffer and a preservative may be added thereto. The preparations may contain the piperidine derivative of formula (I) or its pharmaceutically-acceptable salt of the invention in an amount of from 1.0 to 100 % by weight, preferably from 1.0 to 60 % by weight of the total medicines. [0060] When the piperidine derivatives of formula (I) or their pharmaceutically-acceptable salts of the invention are used in clinical sites, then the dose and the administration frequency thereof may vary depending on the sex, the age, 20 the body weight and the condition of the patient and on the type and the scope of the treatment of the patient In oral administration, in general, the dose may be from 0.01 to 100 m/kg-adult/day, preferably from 0.03 to 1 m/kg-adult/day, and it may be administered all at a time or may be administered in a few times as divided into a few portions. In parenteral administration, its dose may be from 0.001 1 to 10 mg/kg-adult/day, preferably from 0.001 to 0.1 m/kg-adult/day, and it may be administered all at a time or may be administered in a few times as divided into a few portions. Not limited to 25 the dose ranges as above, any ordinary physicians, veterinarians and clinicians may readily determine the effective dose necessary for retarding, inhibiting or stopping the development of diseases. [0061] In their use, the piperidine derivatives of formula (I) and their pharmaceutically-acceptable salts of the invention may be combined with one or more other agents effective for treatment of metabolic disorders and/or dietary disorders, circulatory system diseases, and central or peripheral nervous system diseases. The individual ingredients to be com- 30 bined may be administered at the same time or at different times or successively in order during the treatment period, either as one preparation or as divided different preparations. The ingredients include, for example, co-medicines effective for hypertension, obesity-related hypertension, hypertension-related disorders, cardiomegaly, left ventricle hypertrophy, metabolic disorders, obesity, obesity-related disorders. In other words, the compounds of the invention may be combined with any other co-medicines for so-called combination therapy. 35 [0062] When one or more such co-medicines are combined with a piperidine derivative of formula (I) or its pharmaceutically-acceptable salt of the invention for such combination therapy and when they are administered all at a time, then they may be in the form of a pharmaceutical composition for single administration. On the other hand, when they are administered at the same time or differently or successively, then they may be in different packages. The dose of the co-medicine may depend on the clinical use thereof, and may be suitably determined in accordance with the admin- 40 istration object, the administration route, the diseases and the combination. The form of the co-medicine for administration is not specifically defined, and it may be combined with the piperidine derivative of formula (I) or its pharmaceutically- acceptable salt of the invention when they are administered The administration with co-medicines mode includes, for example, the following: (1) A compound of the invention is combined with a co-medicine to give a single preparation for single administration; (2) a compound of the invention and a co-medicine are separately formulated into different two 45 preparations, and the two preparations are simultaneously administered in one administration route; (3) a compound of the invention and a co-medicine are separately formulated into different two preparations, and they are administered at different times in one and the same administration route; (4) a compound of the invention and a co-medicine are separately formulated into different two preparations, and they are administered at the same time in two different administration routes; (5) a compound of the invention and a co-medicine are separately formulated into different two preparations, 50 and they are administered at different times in different administration routes (for example, a compound of the invention and a co-medicine are administered in that order, or in an order contrary to this). The blend ratio of the piperidine derivative of formula (I) or its pharmaceutically-acceptable salt of the invention and the co-medicine may be suitably determined depending on the administration object, the administration route, and the disease for the administration. [0063] Therapeutical medicines for diabetes that may be used for such co-medicines include, for example 1) PPAR- 55 γ agonists such as glitazones [e.g., ciglitazone, darglitazone, englitazone, isaglitazone, MCC-555], pioglitazone, rosigl- itazone, troglitazone, BRL49653, CLX-0921, 5-BTZD, GW-0207, LG-100641, LY-300512; 2) biguanides such as met- formin, buformin, phenformin; 3) protein tyrosine phosphatase 1B inhibitors; 4) sulfonylureas such as acetohexamide, chloropropamide, diabinese, glibenclamide, glipizide, glyburide, glimepiride, glicilazide, glipentide, gliquidone, glisola-

19 EP 1 669 350 B1

mide, trazamide, tolubutamide; 5) meglitinides such as repaglinide, nateglinide; 6) α-glucoside hydrolase inhibitors such as acarbose, adiposine, camiglibose, emiglitate, miglitol, voglibose, pradimicin-Q, salbostatin, CKD-711, MDL-25,673, MDL-73,945, MOR14; 7) α-amylase inhibitors such as tendamistat, trestatin, A13688; 8) insulin secretion promoters such as linogliride, A-4166; 9) fatty acid oxidation inhibitors such as clomoxir, etomoxir, 10) A2 antagonists such as 5 midaglizole, isaglidole, deriglidole, idazoxan, earoxan, fluparoxan; 11) insulin or insulin mimetix such as biota, LP-100, novalapid, insulin determir, insulin lispro, insulin glargine, insulin zinc, Lys-Pro-insulin, GLP-1 (73-7), GLP1 amide (7-36); 12) non-thiazolidinediones such as JT-501, farglitazar, 13) PPARα/γco-agonists such as CLX-0940, GW-1536, GW- 1929, GW-2433, KPR-297, L-796449, L-90, SB219994. [0064] Therapeutical medicines for hyperlipemia that may be used for the above-mentioned co-medicines include, 10 for example, 1) bile acid absorption promoters such as cholesterylamine, colesevelem, colestipol, crosslinked dextran dialkylaminoalkyl derivatives, Colestid®, LoCholest®, Questran®; 2) HMG-CoA reductase inhibitors such as atorvastatin, itavastatin, fluvastatin, lovastatin, pravastatin, rivastatin, rosuvastatin, simvastatin, ZD-4522; 3) HMG-CoA synthase inhibitors; 4) cholesterol absorption inhibitors such as snatol ester, β-sitosterol, sterol glucoside, ezetimibe; 5) acyl- coenzyme A cholesterol transacylase inhibitors such as avasimibe, eflucimibe, KY-505, SMP-709; 6) CETP inhibitors 15 such as JTT705, torcetrapib, CP532632, BAY-63-2149, SC-591, SC-795; 7) squalane synthesis inhibitors; 8) antioxidants such as probucol; 9) PPARα agonists such as beclofibrate, benzafibrate, syprofibrate, clofibrate, etofibrate, fenofibrate, gemcabene, gemfibrozil, GW-7647, BM-170744, LY-518674, fibric acid derivatives (e.g., Atromid®, Lopid®, Tricor®); 10) FXR receptor antagonists such as GW-4064, SR-103912; 11) LXR receptor agonists such as GW3965, T9013137, XTCO-179628; 12) lipoprotein synthesis inhibitors such as niacin; 13) renin-angiotensin system inhibitors; 14) microsome 20 triglyceride transportation inhibitors; 15) bile acid reabsorption inhibitors such as BARA1453, SC435, PHA384640, S435, AZD7706; 16) PPARδ agonists such as GW501516, GW590735; 17) triglyceride synthesis inhibitors; 18) MTTP inhibitors such as LAB687, CP346086; 19) low-density lipoprotein; 20) squalane epoxidase inhibitors; 21) platelet agglutination inhibitors; 22) 5-lipoxygenase activation protein inhibitors such as MK-591. [0065] Therapeutical medicines for hypertension that may be used for the above-mentioned co-medicines include, 25 for example, 1) thiazide diuretics such as chlorothialidon, chlorothiazide, dichlorofenamide, hydrofluorothiazide, inda- pamide, hydrochlorothiazide; loop diuretics such as bumetanide, ethacrynic acid, flosemide, tolusemide; sodium diuretics such as amyloride, triamuteren; aldosterone antagonist diuretics such as spironolactone, epilenone; 2) (β-adrenaline blockers such as acebutolol, atenolol, betaxolol, bevantolol, bisoprolol, bopindolol, carteolol, carvedilol, celiprolol, es- molol, indenolol, metaprolol, nadolol, nebivolol, penbutolol, pindolol, probanolol, sotalol, tartatolol, tilisolol, timolol; 3) 30 calcium channel blockers such as amlodipine, aranidipine, azelnidipine, bamidipine, benidipine, bepridil, cinaldipine, clevidipine, diltiazem, efonidipine, felodipine, gallopamil, isradipine, lacidipine, lemildipine, lercanidipine, nicardipine, nifedipine, nilvadipine, nimodepine, nisoldipine, nitrendipine, manidipine, pranidipine, verapamil; 4) angiotensin trans- ferase inhibitors such as benazepril, captopril cilazapril, delapril, enalapril, fosinopril, imidapril, rosinopril, moexipril, quinapril, quinaprirat, ramipril, perindopril, periondopril, quanipril, spirapril, tenocapril, transolapril, zofenopril; 5) neutral 35 endopeptidase inhibitors such as omapatrilat, cadoxatril, ecadotril, fosidotril, sampatrilat, AVE7688, ER4030; 6) endo- serine antagonists such as tezosentan, A308165, YM62899; 7) vasodilators such as hydraladine, clonidine, minoxidil, nicotinyl alcohol; 8) angiotensin II antagonists such as candesartan, eporsartan, iribesartan, rosartan, pratosartan, tasosartan, telmisartan, balsartan, EXP-3137, FI6828K, RNH6270; 9) α/β adrenalin blockers such as nipradilol, arotinolol, amoslalol; 10) αI blockers such as terazosin, urapidil, purazosin, bunazosin, trimazosin, doxazosin, naphthopidil, indo- 40 lamin, WHIP164, XEN010; 11) α2 agonists such as lofexidine, tiamenidine, moxonidine, rilmenidine, guanobenz; 12) aldosterone inhibitors. [0066] Anti-obesity medicines that may be used for the above-mentioned co-medicines include, for example, 1) 5HT (serotonin) transporter inhibitors such as paraxetine, fluoxetine, fenfluramine, fluvoxamine, sertraline, imipulamin; 2) norepinephrine transporter inhibitors such as GW320659, decipulamin, talsupramin, nomifensin; 3) cannabinoid-1 re- 45 ceptor 1 (CB-1) antabonists/inverse-agonists such as limonabant (Sanofi Synthelabo), SR-147778 (Sanofi Synthelabo), BAY-65-2520 (Bayer), SLV-318 (Sorbei), as well as compounds disclosed in USP 5,532,237, USP 4,973,587, USP 5,013,837, USP 5,081,122, USP 5,112,820, USP 5,292,736, USP 5,624,941, USP 6,028,084, WO96/33159, WO98/33765, WO98/43636, WO98/43635, WO01/09120, WO01/96330, WO98/31227, WO98/41519, WO98/37061, WO00/10967, WO00/10968, WO97/29079, WO99/02499, WO01/58869, WO02/076949, WO01/64632, WO01/64633, 50 WO01/64634, WO03/006007, WO03/007887, EP-658546; 4) glerin antagonists such as compounds disclosed in WO01/87355, WO02/08250; 5) histamine(H3) antagonis/inverse-agonists such as thioperamide, 3-(1H-imidazol-4-yl) propyl-N-(pentenyl)-carbonate, clobenpropit, iodofenpropit, imoproxyfen, GT2395, A331440, compounds disclosed in WO02/15905, O-[3-(1H-imidazol-4-yl)propanol] carbamate, piperazine-containing H3-receptor antagonists (Lazewska, D. et al., Phrmazie, 56: 927-32 (2001), benzophenone derivatives Sasse, A. et al., Arch Pharm. (Weinheim) 334: 45-52 55 (2001)), substituted N-phenylcarbamates (Reidemister, S. et aL, Pharmazie, 55: 83-6 (2000)), proxyfen derivatives (Sasse, A. et al., J. Med. Chem., 43: 3335-43 (2000)); 6) MCH-1R antagonists such as T-226296 (Takeda), SNP-7941 (Synaptic), other compounds disclosed in WO01/82925, WO01/87834, WO02/051809, WO02/06245, WO02/076929, WO02/076947, WO02/04433, WO02/51809, WO02/083134, WO02/094799, WO03/004027, JP-A-2001-226269; 7)

20 EP 1 669 350 B1

MCH-2R agonists/antagonists; 8) NPY1 antagonists such as isopropyl 3-chloro-5-(1-(6-[2-(5-ethyl-4-methyl-thiazol-2- yl)ethyl]-4-morpholinyl-4-yl-pyridin-2-ylamino)-ethyl)phenyl]carbamate, BIBP3226, BIB03304, LY-357897, CP-671906, GI-264879, and other compounds disclosed in USP 6,001,836, WO96/14307, WO01/23387, WO99/51600, WO01/85690, WO01/85098, WO01/85173, WO01/89528; 9) NPY5 antagonists such as 152804, GW-569180A, GW- 5 594884A, GW-587081X, GW-548118X, FR235,208, FR226928, FR240662, FR252384,1229U91, GI-264879A, CGP71683A, LY-377897, LY366377, PD-160170, SR-120526A, SR-120819A, JCF-104, H409/22, and other compounds disclosed in USP 6,140,354, USP 6,191,160, USP 6,258,837, USP 6,313,298, USP 6,337,332, USP 6,239,395, USP 340,683, USP 6,326,375, USP 6,329,395, USP 6,337,332, USP 6,335,345, EP-01010691, EP-01044970, WO97/19682, WO97/20820, WO97/20821, WO97/20822, WO97/20823, WO98/27063, WO00/107409, WO00/185714, 10 WO00/185730, WO00/64880, WO00/68197, WO00/69849, WO01/09120, WO01/14376, WO01/85714, WO01/85730, WO01/07409, WO01/02379, WO01/02379, WO01/23388, WO01/23389, WO01/44201, WO01/62737, WO01/62738, WO01/09120, WO02/20488, WO02/22592, WO02/48152, WO02/49648, WO02/094789, and compounds disclosed in Norman et al., J. Med. Chem., 43:4288-4312 (2000); 10) reptins such as human recombinant reptin (PEG-OB, Hoffman La Roche), recombinant methionylreptin (Amgen); 11) reptin derivatives such as compounds disclosed in USP 5,552,524, 15 USP 5,552,523, USP 5,552,522, USP 5,521,283, WO96/23513, WO96/23514, WO96/23515, WO96/23516, WO96/23517, 96/23518, WO96/23519, WO96/23520; 12) opioid antagonists such as narmefen (Revex®), 3-methoxy- nartorexon, naroxon, nartolexon, compounds disclosed in WO00/21509; 13) aurexin antagonists such as SB-334867A, and other compounds disclosed in WO01/96302, WO01/68609, WO02/51232, WO02/51838, WO03/023561; 14) vonbe- sin receptor subtype-3 agonists; 15) cholecistokinin A (CCK-A) agonists such as AR-R15849, GI-181771, JMV-180, A- 20 71378, A-71623, SR-146131, and other compounds disclosed in USP 5,739,106; 16) CNTF (ciliary neurotrophic factors) such as GI-181771 (Glaxo-Smith Kline), SR146131 (Sanofi Synthelabo), butabindide, PD170,292, PD149164 (Pfizer); 17) CNTF derivatives such as axokine (Regeneron), and other compounds disclosed in WO94/09134, WO98/22128, WO99/43813;18) growth hormone secretion receptor agonists such as NN703, hexarelin, MK-0677, SM-130686, CP- 424,391, L-692,429, L-163,255, and compounds disclosed in USP 6,358,951, US Patent Application Nos. 2002/049196, 25 2002/022637, WO01/56592, WO02/32888; 19) serotonin receptor-2C agonists such as BVT933, DPCA37215, IK264, PNU22394, WAY 161503, R-1065, YN348, and other compounds disclosed in USP 3,914,250, WO02/36596, WO02/48124, WO02/10169, WO01/66548, WO02/44152, WO02/51844, WO02/40456, WO02/40457; 20) melanocholtin-3 receptor agonists; 21) melanocholtin-4 receptor agonists such as CHIR86036 (Chiron), ME-10142, ME-10145 (Melacure), and other compounds disclosed in WO99/64002, WO00/74679, WO01/991752, WO01/74844, WO01/70708, 30 WO01/70337, WO01/91752, WO02/059095, WO02/059107, WO02/059108, WO02/059117, WO02/12166, WO02/11715, WO02/12178, WO02/15909, WO02/068387, WO02/068388, WO02/067869, WO03/007949, WO03/009847; 22) monoamine reabsorption inhibitors such as cibtramin (Meridia®/Recuctil® and its salts, and other derivatives disclosed in USP 4,476,680, USP 4,806,570, USP 5,436,272, US Patent Application No. 2002/0006964, WO01/27068, WO01/62341; 23) serotonin re-uptake inhibitors such as dexfenfluramine, fluoxetine, and other com- 35 pounds disclosed in USP 6,365,633, WO01/27060, WO01/162341; 24) glucagon-like peptide-1 agonists; 25) topiramate (Topimax®); 26) phytopharm compound 57 (e.g., CP644,673); 27) acetyl CoA carboxylase-2 (ACC2) inhibitors; 28) β- adrenalin receptor-3 agonists such as AD9677/TAK677 (Dai-Nippon Pharmaceutical/Takeda Chemical), CL-316,243, SB418790, BRL-37344, L-796568, BMS-196085, BRL-35135A, CGP12177A, BTA-243, W427353, trecadrine, Zeneca D7114, SR59119A, and other compounds disclosed in USP 5,705,515, USP 5,451,677, WO01/74782, WO02/32898; 40 29) diacylglycerol acyltransferase-1 inhibitors; 30) diacylglycerol acyltransferase-2 inhibitors, 31) fatty acid synthesis inhibitors such as carulenin, C75; 32) phosphodiesterase inhibitors such as theofylline, pentoxifylline, zaprinast, sildenafil, amrinone, milrinone, cilostamide, rolipram, cilomilast; 32) thyroid hormone-β agonists such as KB-2611 (KaroBioBMS), and other compounds disclosed in WO02/15845, JP-A-2000-256190; 33) phytanic acids such as phytanic acid, 4-[(E)- 2-(5,6,7,8-tetrahydro-5,5,8,8-tetramethyl-2-naphthalenyl-1-propenyl]benzoic acid (TTNPB), retinoic acid, and other 45 compounds disclosed in WO99/00123; 34) acylestrogens such as oleoylestrone, and other compounds disclosed in del Mar-Grasa, M. et al., Obesity Research, 9:202-9 (2001); 35) glucocorticoid antagonists; 36) 11-β hydroxysteroid dehy- drogenase-1 inhibitors such as BVT3498, BVT2733, and other compounds disclosed in WO01/90091, WO01/90090, WO01/90092; 37) stearoyl-CoA desaturase-1 inhibitors; 38) dipeptidyl peptidase-IV inhibitors such as isoleucine thia- zolidine, valine pyrrolidide, NVP-DPP728, AF237, P93/01, TSL225, TMC-2A/2B/2C, FE999011, P9310/K364, VIP0177, 50 SDZ274-444, and other compounds disclosed in WO03/004498, WO03/004496, EP1258476, WO02/083128, WO02/062764, WO03/000250, WO03/002530, WO03/002531, WO03/002553, WO03/002539, WO03/000180, WO03/000181; 39) lipase inhibitors such as tetrahydroliptatin (Orlistat/Xenical®), Triton WR1339, RHC80267, lipstatin, teasaponin, diethylumbelliferyl phosphate, FL-386, WAY-121898, Bay-N-3176, valilactone, esteracin, ebelactone A, ebelactone B, RHC80267, and other compounds disclosed in WO01/77094, USP 4,598,089, USP 4,452,813, USP 55 5,512,565, USP 5,391,571, USP 5,602,151, USP 4,405,644, USP 4,189,438, USP 4,242,453; 39) fatty acid transporter inhibitors; 40) dicarboxylate transporter inhibitors; 41) glucose transporter inhibitors; 42) phosphate transporter inhibitors. [0067] Regarding the combination of the piperidine derivative of formula (I) or its pharmaceutically-acceptable salt of the invention with any of the above-mentioned co-medicines, a combination with one or more selected from a group

21 EP 1 669 350 B1

consisting of medicines for diabetes and medicines for hyperlipemia is useful for prevention or remedy of metabolic disorders. In particular, a combination with a medicine for hypertension and a medicine for obesity along with a medicine for diabetes and/or a medicine for hyperlipemia is useful for prevention or remedy of metabolic disorders owing to the synergistic effect thereof. 5 [0068] The invention is described more concretely with reference to the following Formulation Examples and Production Examples, which, however, do not restrict the invention. [0069] For thin-layer chromatography of compounds, used was a plate of Silicagel 60F245 (Merck); and for detection, used was a UV detector. Wakogel® C-300 (Wako Pure Chemicals) was used for the column silica gel; and LC-SORB® SP-B-ODS (Chemco) or YMC-GEL® ODS-AQ 120-S50 (Yamamura Chemical Laboratories) was for the reversed-phase 10 column silica geL [0070] Mass spectrum was determined according to an electrospray ionization (ESI) process, using QuattroII (Micro- mass).

Example 1: 15 [Production of Piperidine Derivatives]

Compound 1:

20 N-methyl-N-(1-methylpiperidin-4-yl)-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide

[0071]

30 [0072] At room temperature, 1-methyl(4-methylamino)piperidine (0.056 ml, 0.38 mmols), O-(7-azabenzotriazol-1-yl- N,N,N’,N’-tetramethyluronium hexafluorophosphate (121 mg, 0.32 mmols) and diisopropylethylamine (0.17 ml, 0.96 mmols) were added to a dimethylformamide solution (1.0 ml) of 4-[(4-piperidin-1-yl)piperidin-1-yl]benzoic acid hydrochloride (103 mg, 0.32 mmols) obtained in Reference Example 1, and stirred in a nitrogen atmosphere at room temper- 35 ature for 14 hours. The reaction solution was extracted with ethyl acetate, the organic layer was washed with water, saturated sodium bicarbonate solution and saturated saline solution in the order, dried with anhydrous magnesium sulfate, and then concentrated. The residue was purified through preparative thin-layer chromatography (chloroform/ methanol/aqueous ammonia = 10/1/0.1) to obtain the entitled compound (56 mg, 44 %). 1 H NMR (400 MHz, CDCl3, δ ppm): 1.43-2.07 (18H, m), 2.24-2.31 (3H, m), 2.50-2.70 (4H, m), 2.72-2.82 (2H, m), 2.86-2.96 40 (5H, m), 3.79-3.87 (2H, m), 6.87 (2H, d, J = 8.8 Hz), 7.28 (2H, d, J = 8.8 Hz); Mass spectrum (ESI): 399 (M + H) [0073] The following compounds 2 to 23 were produced in the same production method as that for the compound 1, or according to the method, or in combination of the method with an ordinary method

45 Compound 2:

N-(1-methylpiperidin-4-yl)-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide:

[0074] 50

[0075] The compound was produced according to the same production method as that for the compound 1, for which, however, 1-methyl-4-aminopiperidine was used in place of 1-methyl(4-methylamino)piperidine.

22 EP 1 669 350 B1

1 HNMR(400 MHz, CDCl3, δ ppm): 1.41-1.78(10H, m), 1.88-1.96 (2H, m), 1.99-2.06 (2H, m), 2.11-2.20 (2H, m), 2.29 (3H, s), 2.41-2.58 (5H, m), 2.74-2.85 (4H, m), 3.83-3.90 (2H, m), 3.92-4.02 (1H, m), 5.80 (1H, brd, J= 7.6 Hz), 6.86 (2H, d, J = 8.8 Hz), 7.62 (2H, d, J = 8.8 Hz); Mass spectrum (ESI): 385 (M + H) 5 Compound 3:

N-methyl-N-(1-cyclobutylpiperidin-4-yl)-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide

10 [0076]

[0077] The compound was produced according to the same production method as that for the compound 1, for which, 20 however, 1-cyclobutyl(4-methylamino)piperidine was used in place of 1-methyl(4-methylamino)piperidine. 1 H NMR (400 MHz, CDCl3, δ ppm): 1.41-2.07 (21H, m), 2.40-2.59 (6H, m), 2.62-2.80 (4H, m), 2.83-2.90 (2H, m), 2.90 (3H, s), 3.79-3.86 (2H, m), 6.87 (2H, d, J = 8.8 Hz), 7.27 (2H, d, J = 8.8 Hz); Mass spectrum (ESI): 439 (M + H)

25 Compound 4:

N-methyl-N-(1-cyclopentylpiperidin-4-yl)-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide

[0078] 30

[0079] The compound was produced according to the same production method as that for the compound 1, for which, however, 1-cyclopentyl(4-methylamino)piperidine was used in place of 1-methyl(4-methylamino)piperidine. 1 H NMR (400 MHz, CDCl3, δ ppm): 1.33-2.10 (25H, m), 2.40-2.58 (6H, m), 2.72-2.80 (2H, m), 2.90 (3H, s), 3.04-3.14 40 (2H, m), 3.79-3.86 (2H, m), 6.87 (2H, d, J = 8.8 Hz), 7.28 (2H, d, J = 8.8 Hz); Mass spectrum (ESI): 453 (M + H)

Compound 5:

45 N-methyl-N-(1-cyclohexylpiperidin-4-yl)-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide

[0080]

55 [0081] The compound was produced according to the same production method as that for the compound 1, for which, however, 1-cyclohexyl(4-methylamino)piperidine was used in place of 1-methyl(4-methylamino)piperidine. 1 H NMR (400 MHz, CDCl3, δ ppm): 1.00-1.30 (6H, m),1.40-1.49 (2H, m),1.56-1.1.95 (19H, m), 2.24-2.35 (1H, m), 2.38-2.47 (1H, m), 2.49-2.57 (4H, m), 2.71-2.80 (2H, m), 2.86-3.00 (2H, m), 2.90 (3H, s), 3.79-3.86 (2H, m), 6.87 (2H,

23 EP 1 669 350 B1

d, J = 8.8 Hz), 7.28 (2H, d, J = 8.8 Hz); Mass spectrum (ESI): 467 (M + H)

Compound 6: 5 N-methyl-N-(1 -cyclohexylmethylpiperidin-4-yl)-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide

[0082]

[0083] The compound was produced according to the same production method as that for the compound 1, for which, however, 1-cyclohexylmethyl(4-methylamino)piperidine was used in place of 1-methyl(4-methylamino)piperidine. 1 H NMR (400 MHz, CDCl3, δ ppm): 0.78-0.91 (2H, m), 1.05-1.28 (4H, m),1.33-1.49 (4H, m),1.52-1.95 (20H, m), 2.02-2.12 20 (2H, m), 2.38-2.60 (4H, m), 2.68-2.80 (2H, m), 2.82-2.97 (1H, m), 2.90 (3H, s), 3.77-3.86 (2H, m), 6.87 (2H, d, J = 8.8 Hz), 7.28 (2H, d, J = 8.8 Hz); Mass spectrum (ESI): 481 (M + H)

Compound 7: 25 N-methyl-N-[(3R)-1-cyclopentylpyrrolidin-3-yl)]-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide

[0084]

[0085] The compound was produced according to the same production method as that for the compound 1, for which, however, 1-cyclopentyl((3R)-methylamino)pyrrolidine was used in place of 1-methyl(4-methylamino)piperidine. 40 1 H NMR (400 MHz, CDCl3, δ ppm): 1.33-2.13 (20H, m), 2.32-2.78 (12H, m), 3.01 (3H, s), 3.77-3.84 (2H, m), 4.50-4.80 (1H, m), 6.86 (2H, d, J = 8.4 Hz), 7.27 (2H, d, J = 8.4 Hz); Mass spectrum (ESI): 439 (M + H)

Compound 8: 45 N-methyl-N-[(3S)-1-cyclopentylpyrrolidin-3-yl)]-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide

[0086]

[0087] The compound was produced according to the same production method as that for the compound 1, for which,

24 EP 1 669 350 B1

however, 1-cyclopentyl((3S)-methylamino)pyrrolidine was used in place of 1-methyl(4-methylamino)piperidine. 1 H NMR (400 MHz, CDCl3, δ ppm): 1.33-2.13 (20H, m), 2.32-2.78 (12H, m), 3.01 (3H, s), 3.77-3.84 (2H, m), 4.50-4.80 (1H, m), 6.86 (2H, d, J = 8.4 Hz), 7.27 (2H, d, J = 8.4 Hz); Mass spectrum (ESI): 439 (M + H) 5 Compound 9:

N-methyl-N-[(3R)-1-benzylpyrrolidin-3-yl]-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide

10 [0088]

[0089] The compound was produced according to the same production method as that for the compound 1, for which, 20 however, 1-benzyl((3R)-methylamino)pyrrolidine was used in place of 1-methyl(4-methylamino)piperidine. 1 H NMR (400 MHz, CDCl3, δ ppm): 1.41-1.48 (2H, m), 1.55-1.74 (8H, m), 1.86-1.95 (3H, m), 2.24-2.31 (1H, m), 2.38-2.58 (6H, m), 2.69-2.79 (3H, m), 2.81-2.88 (1H, m), 3.03 (3H, s), 3.45-3.50 (1H, m), 3.62-3.68 (1H, m), 3.78-3.85 (2H, m), 6.85 (2H, d, J = 8.0 Hz), 7.20-7.30 (5H, m), 7.28 (2H, d, J = 8.0 Hz); Mass spectrum (ESI): 461 (M + H) 25 Compound 10:

N-methyl-N-[(3R)-1-benzylpyrrolidin-3-yl)]-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide

30 [0090]

[0091] The compound was produced according to the same production method as that for the compound 1, for which, 40 however, 1-benzyl((3S)-methylamino)pyrrolidine was used in place of 1-methyl(4-methylamino)piperidine. 1 H NMR (400 MHz, CDCl3, δ ppm): 1.41-1.48 (2H, m), 1.55-1.74 (8H, m),1.86-1.95 (3H, m), 2.24-2.31 (1H, m), 2.38-2.58 (6H, m), 2.69-2.79 (3H, m), 2.81-2.88 (1H, m), 3.03 (3H, s), 3.45-3.50 (1H, m), 3.62-3.68 (1H, m), 3.78-3.85 (2H, m), 6.85 (2H, d, J = 8.0 Hz), 7.20-7.30 (5H, m), 7.28 (2H, d, J = 8.0 Hz); Mass spectrum (ESI): 461 (M + H) 45 Reference compound 11:

N-(pyridin-4-yl)-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide trifluoroacetate

50 [0092]

25 EP 1 669 350 B1

10 [0093] The compound was produced according to the same production method as that for the compound 1, for which, however, 4-aminopyridine was used in place of 1-methyl(4-methylamino)piperidine. 1 H NMR (400 MHz, CD3OD, δ ppm): 1.47-1.60 (1H, m), 1.70-1.90 (5H, m), 1.95-2.05 (2H, m), 2.16-2.25 (2H, m), 2.90-3.08 (4H, m), 3.32-3.48 (1H, m), 3.50-3.59 (2H, m), 4.13-4.21 (2H, m), 7.08 (2H, d, J = 8.8 Hz), 7.94 (2H, d, J = 8.8 Hz), 8.29 (2H, d, J = 8.4 Hz), 8.57 (2H, d, J = 8.4 Hz); 15 Mass spectrum (ESI): 365 (M + H)

Compound 12:

2-{4-(piperidin-1-yl)piperidin-1-yl]benzoyl-1,2,3,4-tetrahydroisoquinoline 20 [0094]

30 [0095] The compound was produced according to the same production method as that for the compound 1, for which, however, 1,2,3,4-tetrahydroisoquinoline was used in place of 1-methyl(4-methylamino)piperidine. 1 H NMR (400 MHz, CDCl3, δ ppm): 1.41-1.51 (2H, m), 1.57-1.73 (6H, m),1.88-1.97 (2H, m), 2.41-2.61 (5H, m), 2.73-2.83 (2H, m), 2.88-2.97 (2H, m), 3.72-3.92 (4H, m), 4.70-4.83 (2H, m), 6.89 (2H, d, J= 8.8 Hz), 7.01-7.21 (4H, m), 7.37 (2H, 35 d, J = 8.8 Hz); Mass spectrum (ESI): 404 (M + H)

Compound 13:

40 1-{4-(piperidin-1-yl)piperidin-1-yl]benzoyl-1,2,3,4-tetrahydroquinoline

[0096]

50 [0097] The compound was produced according to the same production method as that for the compound 1, for which, however, 1,2,3,4-tetrahydroquinoline was used in place of 1-methyl(4-methylamino)piperidine. 1 H NMR (400 MHz, CDCl3, δ ppm): 1.28-4.42 (25H, m), 6.68-7.77 (8H, m); Mass spectrum (ESI): 404 (M + H) 55

26 EP 1 669 350 B1

Compound 14:

1-{4-(piperidin-1-yl)piperidin-1-yl]benzoyl-4-phenylpiperazine

5 [0098]

[0099] The compound was produced according to the same production method as that for the compound 1, for which, however, 4-phenylpiperazine was used in place of 1-methyl(4-methylamino)piperidine. 1 H NMR (400 MHz, CDCl3, δ ppm): 1.40-1.50 (2H, m), 1.55-1.72 (6H, m),1.88-1.98 (2H, m), 2.40-2.60 (5H, m), 2.72-2.82 20 (2H, m), 3.10-3.23 (4H, m), 3.70-3.88 (6H, m), 6.81-6.98 (5H, m), 7.21-7.30 (2H, m), 7.35 (2H, d, J= 8.8 Hz); Mass spectrum (ESI): 433 (M + H)

Compound 15:

25 N-methyl-N-[1-(pyrimidin-2-yl)piperidin-4-yl]-[4-(piperidin-1-yl)piperidin-1-yl]benzamide

[0100]

35 [0101] The compound was produced according to the same production method as that for the compound 1, for which, however, 1-(pyrimidin-2-yl)-4-methylaminopiperidine was used in place of 1-methyl(4-methylamino)piperidine. 1 H NMR (400 MHz, CDCl3, δ ppm): 1.40-1.50 (2H, m), 1.55-1.88 (11H, m), 1.90-2.01 (2H, m), 2.41-2.63 (5H, m), 2.71-2.99 (4H, m), 2.87 (3H, s), 3.80-3.90 (2H, m), 4.82-4.92 (2H, m), 6.46 (1H, t, J = 4.8 Hz), 6.88 (2H, d, J = 8.8 Hz), 7.31 (2H, d, J = 8.8 Hz), 8.28 (2H, d, J = 4.8 Hz); 40 Mass spectrum (ESI): 463 (M + H)

Compound 16:

N-methyl-N-(thiophen-2-yl)methyl-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide 45 [0102]

55 [0103] The compound was produced according to the same production method as that for the compound 1, for which, however, 2-methylaminomethylthiophene was used in place of 1-methyl(4-methylamino)piperidine. 1 H NMR (400 MHz, CDCl3, δ ppm): 1.40-1.50 (2H, m), 1.57-1.72 (6H, m), 1.88-1.97 (2H, m), 2.41-2.60 (5H, m), 2.70-2.80 (2H, m), 3.00 (3H, s), 3.80-3.88 (2H, m), 4.70-4.81 (2H, m), 6.86 (2H, d, J= 8.8 Hz), 6.92-7.00 (2H, m), 7.21-7.28 (1H,

27 EP 1 669 350 B1

m), 7.39 (2H, d, J = 8.8 Hz); Mass spectrum (ESI): 398 (M + H)

Compound 17: 5 N-methyl-N-phenethyl-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide

[0104]

[0105] The compound was produced according to the same production method as that for the compound 1, for which, however, methylphenethylamine was used in place of 1-methyl(4-methylamino)piperidine. 20 1 H NMR (400 MHz, CDCl3, δ ppm): 1.37-1.50 (2H, m), 1.52-2.72 (6H, m), 1.79-1.99 (2H, m), 2.01-2.62(6H, m), 2.66-2.80 (2H, m), 2.82-3.12 (4H, m), 3.43-3.72 (2H, m), 3.77-3.90 (2H, m), 6.80-6.92 (2H, m), 6.96-7.40 (7H, m); Mass spectrum (ESI): 406 (M + H)

Compound 18: 25 1-{4-(pipendin-1-yl)piperidin-1-yl]benzoyl-3-(3,4-difluorophenyl)pyrrolidine

[0106]

[0107] The compound was produced according to the same production method as that for the compound 1, for which, 40 however, 3-(3,4-difluorophenyl)pyrrolidine was used in place of 1-methyl(4-methylamino)piperidine. 1 H NMR (400 MHz, CDCl3, δ ppm): 1.40-1.50 (2H, m), 1.55-1.78(6H,m), 1.85-2.12 (4H, m), 2.20-2.68 (6H, m), 2.70-2.88 (2H, m), 3.22-4.15 (6H, m), 6.82-7.20 (5H, m), 7.43-7.59 (2H, m); Mass spectrum (ESI): 454 (M + H)

45 Compound 19:

4-{4-(piperidin-1-yl)piperidin-1-yl]benzoylpiperidin-1-yl

[0108] 50

28 EP 1 669 350 B1

[0109] The compound was produced according to the same production method as that for the compound 1, for which, however, piperidine was used in place of 1-methyl(4-methylamino)piperidine. 1 H NMR (400 MHz, CDCl3, δ ppm): 1.16-2.10 (16H, m), 2.34-2.64 (5H, m), 3.22-3.90 (4H, m), 6.87 (2H, d, J= 7.2 Hz), 728 (2H, d, J = 7.2 Hz); 5 Mass spectrum (ESI): 356 (M + H)

Compound 20:

N-methyl-N-(1-methylpiperidin-4-yl)-4-[4-(pyrrolidin-1-yl)piperidin-1-yl]benzamide 10 [0110]

[0111] Using 4-{4-(pyrrolidin-1-yl)piperidin-1-yl}benzoic acid hydrochloride that had been produced in the same pro- 20 duction method as that for 4-{4-(piperidin-1-yl)piperidin-1-yl}benzoic acid hydrochloride produced in Reference Example, or according to the method, or in combination of the method with an ordinary method, the entitled compound was produced according to the same production method as that for the compound 1. 1 H NMR (400 MHz, CDCl3, δ ppm): 1.62-1.72 (4H, m), 1.79-2.04 (12H, m), 2.16-2.24 (1H, m), 2.26 (3H, s), 2.59-2.66 (4H, m), 2.77-2.92 (3H, m), 2.90 (3H, s), 3.72-3.79 (2H, m), 6.87 (2H, d, J = 8.8 Hz), 7.28 (2H, d, J = 8.8 Hz); 25 Mass spectrum (ESI): 385 (M + H)

Compound 21:

N-methyl-N-(1-methylpiperidin-4-yl)-4-[4-(azetidin-1-yl)piperidin-1-yl]benzamide 30 [0112]

[0113] Using 4-{4-(azetidin-1-yl)piperidin-1-yl}benzoic acid hydrochloride that had been produced in the same pro- 40 duction method as that for 4-{4-(piperidin-1-yl)piperidin-1-yl}benzoic acid hydrochloride produced in Reference Example, or according to the method, or in combination of the method with an ordinary method, the entitled compound was produced according to the same production method as that for the compound 1. 1 H NMR (400 MHz, CDCl3, δ ppm): 1.40-1.53 (2H, m),1.57-2.35 (14H, m), 2.29 (3H, s), 2.77-3.00 (3H, m), 2.90 (3H, s), 3.24-3.37 (3H, m), 3.66-3.75 (2H, m), 6.60 (2H, d, J = 8.8 Hz), 7.29 (2H, d, J =8.8 Hz); 45 Mass spectrum (ESI): 371 (M + H)

Compound 22:

N-methyl-N-(1-methylpiperidin-4-yl)-5-[4-(piperidin-1-yl)piperidin-1-yl]pyridine-2-carboxamide 50 [0114]

29 EP 1 669 350 B1

[0115] The entitled compound was produced by reacting 1-methyl(4-methylamino)piperidine and 5-{(4-piperidin-1-yl) piperidin-1-yl}pyridine-2-carboxylic acid. 5-{4-(Piperidin-1-yl)piperidin-1-yl}pyridine-2-carboxylic acid was produced in the same production method as that for 4-[4-(piperidin-1-yl)piperidin-1-yl}benzoic acid hydrochloride produced in Ref- erence Example 1, or according to the method, or in combination of the method with an ordinary method. 5 1 H NMR (400 MHz, CDCl3, δ ppm): 1.41-1.52 (2H, m),1.57-1.73 (6H, m),1.75-2.02 (7H, m), 2.10-2.36 (4H, m), 2.42-2.53 (2H, m), 2.54 (3H, s), 2.77-3.02 (3H, m), 2.98 (3H, s), 3.79-3.97 (3H, m), 4.46-4.58 (1H, m), 7.18 (1R, dd, J=2.8, 8.8 Hz), 7.52 (1H, d, J= 8.8 Hz), 8.19 (1H, d, J=2.8 Hz); Mass spectrum (ESI): 400 (M + H)

10 Compound 23:

N-methyl-N-(1-methylpiperidin-4-yl)-4-[4-(4,4-difluoropiperidin-1-yl)piperidin-1-yl]benzamine

[0116] 15

[0117] The entitled compound was produced by reacting 1-methyl(4-methylamino)piperidme and 4-{(4,4-difluoropiperidin-1-yl)piperidin-1-yl}benzoic acid hydrochloride. 4-{(4,4-Difluoropiperidin-1-yl)piperidin-1-yl}benzoic acid hydro- 25 chloride was produced in the same production method as that for 4-[(4-piperidin-1-yl)piperidin-1-yl}benzoic acid hydrochloride produced in Reference Example 1, or according to the method, or in combination of the method with an ordinary method. 1 H NMR (400 MHz, CDCl3, δ ppm): 1.56-1.76 (6H, m),1.84-2.06 (9H, m), 2.27 (3H, brs), 2.48-2.58 (1H, m), 2.64-2.70 (4H, m), 2.73-2.82 (2H, m), 2.84-2.97 (2H, m), 2.90 (3H, s), 3.78-2.86 (2H, m), 6.87 (2H, d, J = 8.4 Hz), 7.28 (2H, d, J 30 = 8.4 Hz);

Mass spectrum (ESI): 435 (M + H)

Reference Example: 35 4-{4-(Piperidin-1-yl)piperidin-1-yl}benzoic acid hydrochloride

[0118]

1) Production of 4-[(4-piperidin-1-yl)piperidin-1-yl]benzonitrile: 50 Potassium carbonate (4.14 g 30 mmols) and (4-pipendin-1-yl)piperidine (6.05 g, 36 mmols) were added to dimeth- ylsulfoxide solution (10 ml) of 4-fluorobenzonitrile (3.63 g, 30 mmols), and stirred at 95˚C for 3 hours. The reaction mixture was cooled to room temperature, and poured into ice-water (300 ml) and stirred. The insoluble matter formed was taken out through filtration, and dried to obtain the entitled compound (6.35 g, 81 %). 2) Concentrated hydrochloric acid (10 ml) was added to 4-[(4-piperidin-1-yl)piperidin-1-yl]benzonitrile (3.81 g, 14.1 55 mmols), and stirred at 130˚C for 3 hours. The reaction mixture was concentrated under reduced pressure.

The residue was taken out through filtration, washed with methanol/chloroform (2/1), and then dried to obtain the entitled compound (4.23 g, 92 %).

30 EP 1 669 350 B1

[Preparation of Pharmaceutical Compositions]

Formulation Example 1:

5 [0119] 10 parts of the compound of Example 1, 15 parts of heavy magnesium oxide and 75 parts of lactose were uniformly mixed to prepare a powdery or granular preparation having a particle size of at most 350 mm. The preparation is encapsulated to give capsules.

Formulation Example 2: 10 [0120] 45 parts of the compound of Production Example 1,15 parts of starch, 16 parts of lactose, 21 parts of crystalline cellulose, 3 parts of polyvinyl alcohol and 30 parts of distilled water are uniformly mixed, then ground, granulated and dried, and then sieved to give a granular preparation having a particle diameter of from 1410 to 177 mm.

15 Formulation Example 3:

[0121] A granular preparation was prepared in the same manner as in Formulation Example 2. 96 parts of the granular preparation is mixed with 3 parts of calcium stearate, and shaped under compression into tablets having a diameter of 10 mm. 20 Formulation Example 4:

[0122] 90 parts of the granular preparation obtained according to the method of Formulation Example 2 is mixed with 10 parts of crystalline cellulose and 3 parts of calcium stearate, and shaped under compression into tablets having a 25 diameter of 8 mm. These are coated with a mixed suspension of syrup gelatin and precipitated calcium carbonate to give sugar-coated tablets.

Example 2:

30 [Pharmaceutical Test]

[0123] The usefulness of the histamine-H3 receptor antagonist containing a piperidine derivative of formula (I) of the invention as medicines was proven by the following pharmaceutical test examples.

35 Pharmaceutical Test Example 1 (histamine analogue-binding inhibition test):

[0124] A cDNA sequence coding for a human histmiine-H3 receptor [see International Laid-Open WO00/39164) was cloned with expression vectors pCR2.1, pEF1x (by Invitrogen) and pCI-neo (by Promega). The resulting expression vector was transfected into host cells, HEK293 and CHO-K1 (American Type Culture Collection), according to a cationic 40 lipid process [see Proceedings of the National Academy of Sciences of the United States of America, Vol, 84, p. 7413 (1987)] to obtain histamine-H3 receptor expression cells. [0125] A membrane specimen prepared from the cells having expressed a histamine-3 preceptor was incubated in an assay buffer (50 mM Tris buffer, pH 7.4) along with a test compound and 20,000 cpm of [3H]Na-methylhistamine (by NEN) therein at 25˚C for 2 hours, and then filtered through a glass filter GF/C. This was washed with 50 mM Tris buffer 45 (pH 7.4), and the radioactivity on the glass filter was measured. The non-specific binding was determined in the presence a of 10 mM thioperamide (by Sigma), and the 50 % inhibitory concentration (IC50) of the test compound to specific N -methylhistamine binding was calculated [see Molecular Pharmacology, Vol. 55, p. 1101 (1999)].

Pharmaceutical Test Example 2 (histamine analogue-binding inhibition test) 50 [0126] A membrane specimen prepared from the cells having expressed a histamine-H3 receptor was incubated in an assay buffer (50 mM Tris buffer, 100 mM NaCl, 5 mM MgCl2, pH 7.4) along with a test compound, 20 nM R- methylhistamine (histamine analogue, by Sigma), 10 mM GDP (guanine-nucleotide diphosphate, by Sigma), 200 pM [35S] GTPγS (guanine-nucleotide triphosphate analogue, by Amersham) and SPA resin (wheat germ agglutinin SPA 55 beads, by Amersham) therein on a 96-well optiplate (by Packard) at 25˚C for 3 hours and then centrifuged at 3,000 rpm, and its activity was counted with Topcount (by Packard). The non-specific binding was determined in the presence of 35 10 mM GTPγS (by Sigma), and the 50 % inhibitory concentration (IC50) of the test compound to specific [ S] GTPγS binding was calculated [see British Journal of Pharmacology, Vol. 135, p. 383 (2002)].

31 EP 1 669 350 B1

[0127] The results of Pharmaceutical Test Examples 1 and 2 are shown in Table 6.

[Table 6] Compound GTP g S IC50 Binding IC50 5

1 19

10 2 200

15 3 29

4 18

5 36

6 14

30 7 1. 1 7.5

8 14

40 9 33

45 10 79

11 230 50

55 12 87

32 EP 1 669 350 B1

(continued) Compound GTP g S IC50 Binding IC50

5 13 19

10 14 64

15 9.2

20 16 16

25 17 26

30 18 24

35 19 420

40 20 660

21 2400 45

22 180

23 670

33 EP 1 669 350 B1

(continued) Compound GTP g S IC50 Binding IC50

5 24 67

25 42

26 38

25 27 87

30 28 11

35 [0128] As is obvious from the results, the piperidine derivatives strongly inhibited the binding of Na-methylhistamine (histamine analogue) to histamine-H3 receptor.

INDUSTRIAL APPLICABILITY

40 [0129] The novel piperidine derivatives of the invention significantly inhibits the binding of Nα-methylhistamine (histamine analogue) to histamine-H3 receptor-expressing cells, and they effectively act as a histamine-H3 receptor antagonist or inverse-antagonist, and significantly inhibit the in-vitro action of R-α-methylhistamine (selective agonist). The derivatives are effective as preventives or remedies for metabolic system diseases such as obesity, diabetes, hormone secretion disorder, hyperlipemia, gout, fatty liver, circulatory system diseases, for example, stenocardia, acute/congestive 45 cardiac insufficiency, cardiac infarction, coronary arteriosclerosis, hypertension, nephropathy, sleep disorder and various diseases accompanied by sleep disorder such as idiopathic hypersomnmia, repetitive hypersomnnia, true hypersomnnia, narcolepsy, sleep periodic acromotion disorder, sleep apnea syndrome, circadian rhythm disorder, chronic fatigue syndrome, REM sleep disorder, senile insomnia, night worker sleep insanitation, idiopathic insomnia, repetitive insomnia, true insomnia, electrolyte metabolism disorder, and central and peripheral nervous system diseases such as bulimia, 50 emotional disorder, melancholia, anxiety, epilepsy, delirium, dementia, shinzophrenia, attention deficit/hyperactivity disorder, memory disorder, Alzheimer’s disease, Parkinson’s disease, sleep disorder, recognition disorder, motion disorder, paresthesia, dysosmia, epilepsy, morphine resistance, narcotic dependency, alcoholic dependency.

55 Claims

1. A compound of the formula (I):

34 EP 1 669 350 B1

15 wherein:

X1 and X2 independently represent a nitrogen atom or CH; 3 X represents -Os-(CH2)m-, wherein s indicates 0 or 1, and m indicates an integer to make (m + s) = 0 or 1 to 4; 1 2 R and R independently represent a hydrogen atom, a halogen atom, a linear or branched C1-6 alkyl group, a 20 C1-6 alkoxy group, or an acetyl group substituted with 2 or 3 fluorine atoms; Y is selected from the group consisting of:

(1) a group of the formula (IV):

wherein: 35 3 R is a hydrogen atom, or a C1-6 alkyl group, and R4 is a group of the formula (V):

5 wherein R represents a hydrogen atom, a C1-6 alkyl group, a C3 to C8 cycloalkyl group, an aralkyl 50 group, or a heteroaryl group; n indicates 0 or an integer from 1 to 4;

(2) a group of the formula (IV):

35 EP 1 669 350 B1

10 3 wherein R is a hydrogen atom, or a C1-6 alkyl group, and R4 is a group of the formula (VI):

-(CH2)q-A (VI)

15 wherein A represents an aryl group, a heteroaryl group, a condensed bicyclic group of a C4 to C7 cycloalkyl group and an aryl group, or a condensed bicyclic group of a C4 to C7 cycloalkyl group and a heteroaryl group; q indicates an integer from 1 to 3; and (3) a group of the formula (IV):

wherein R3 and R4 form a nitrogen-containing heterocyclic group selected from: piperidinyl, pyrrolidinyl, 30 azetidinyl and homopiperidinyl, any of which is optionally condensed with a phenyl or pyridyl group to form a bicyclic group; or a pharmaceutically-acceptable salt thereof.

1 2. The compound of Claim 1 wherein R and R2 are hydrogen atoms, s is 0 and m is an integer from 1 to 3. 35 3. The compound of Claim 1 wherein X1 and X2 are both CH or one of them is a nitrogen atom.

4. The compound of Claim 2 wherein X3 completes a piperidino group.

40 5. The compound of Claim 1 wherein Y is a group of the formula (IV):

wherein:

3 R is a hydrogen atom, or a C1-6 alkyl group, and 55 R4 is a group of the formula (V):

36 EP 1 669 350 B1

10 5 wherein R represents a hydrogen atom, a C1-6 alkyl group, a C3 to C8 cycloalkyl group, an aralkyl group, or a heteroaryl group; n indicates 0 or an integer from 1 to 4.

6. The compound of Claim 1 wherein in formula (II), Y is a group of the formula (IV):

25 3 wherein R is a hydrogen atom, or a C1-6 alkyl group, and R4 is a group of the formula (VI):

-(CH2)q-A (VI)

30 wherein A represents an aryl group, a heteroaryl group, a condensed bicyclic group of a C4 to C7 cycloalkyl group and an aryl group, or a condensed bicyclic group of a C4 to C7 cycloalkyl group and a heteroaryl group; and q indicates an integer from 1 to 3.

7. The compound of Claim 1 wherein Y is a group of the formula (IV): 35

45 wherein R3 and R4 form a nitrogen-containing heterocyclic group selected from:

piperidinyl, pyrrolidinyl, azetidinyl and homopiperidinyl.

8. The compound of Claim 7 wherein the nitrogen-containing heterocyclic group is piperidinyl. 50 9. The compound as claimed in any one of claims 1 to 8, wherein the piperidine derivative compound of formula (I) is:

37 EP 1 669 350 B1

N-methyl-N-[(3 R)-1-cyclopentylpyrrolidin-3-yl]-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide (7), N-methyl-N-[(3 S)-1-cyclopentylpyrrolidin-3-yl)]-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide (8), N-methyl-N-[(3R)-1-benzylpyrrolidin-3-yl)]-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide (9), N-methyl-N-[(3R)-1-benzylpyrrolidin-3-yl)]-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide (10), 5 2-{4-(piperidin-1-yl)piperidin-1-yl]benzoyl-1,2,3,4-tetrahydroisoquinoline (12), 1-{4-(piperidin-1-yl)piperidin-1-yl]benzoyl-1,2,3,4-tetrahydroquinoline (13), 1-{4-(piperidin-1-yl)piperidin-1-yl]benzoyl-4-phenylpiperazine (14), N-methyl-N-[1-(pyrimidin-2-yl)piperidin-4-yl]-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide (15), N-methyl-N-(thiophen-2-yl)methyl-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide (16), 10 N-methyl-N-phenethyl-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamide (17), 1-{4-(piperidin-1-yl)piperidin-1-yl]benzoyl-3-(3,4-difluorophenyl)pyrrolidine (18), 4-{4-(piperidin-1-yl)piperidin-1-yl]benzoylpiperidin-1-yl (19), N-methyl-N-(1-methylpiperidin-4-yl)-4-[4-(pyrrolidin-1-yl)piperidin-1-yl]benzamide (20), N-methyl-N-(1-methylpiperidin-4-yl)-4-[4-(azetidin-1-yl)piperidin-1-yl]benzamide (21), 15 N-methyl-N-(1-methylpiperidin-4-yl)-5-[4-(piperidin-1-yl)piperidin-1-yl] pyridine-2-carboxamide (22), N-methyl-N-(1-methylpiperidin-4-yl)-4-[4-(4,4-difluoropiperidin-1-yl)piperidin-1-yl]benzamide (23).

10. A compound as claimed in any one of claims 1 to 9 for use in medicine.

20 11. A pharmaceutical composition which comprises a compound as claimed in any one of claims 1 to 9 in admixture with a pharmaceutically acceptable carrier.

12. The use of a compound according to any one of any of claims 1 to 9, for the manufacture of a medicament for the treatment of metabolic system diseases such as obesity, diabetes, hormone secretion disorder, hyperlipemia, gout, 25 fatty liver; or circulatory system diseases, for example, stenocardia, acute/congestive cardiac insufficiency, cardiac infarction, coronary arteriosclerosis, hypertension, nephropathy, or sleep disorder and various diseases accompanied by sleep disorder such as idiopathic hypersomnnia, repetitive hypersomnnia, true hypersomnnia, narcolepsy, sleep periodic acromotion disorder, sleep apnea syndrome, circadian rhythm disorder, chronic fatigue syndrome, REM sleep disorder, senile insomnia, night worker sleep insanitation, idiopathic insomnia, repetitive insomnia, true 30 insomnia, electrolyte metabolism disorder; or central and peripheral nervous system diseases such as bulimia, emotional disorder, melancholia, anxiety, epilepsy, delirium, dementia, schizophrenia, attention deficit/hyperactivity disorder, memory disorder, Alzheimer’s disease, Parkinson’s disease, sleep disorder, recognition disorder, motion disorder, paresthesia, dysosmia, epilepsy, morphine resistance, narcotic dependency, alcoholic dependency.

35 Patentansprüche

1. Eine Verbindung der Formel (I):

wobei: 55 X1 und X2 unabhängig ein Stickstoffatom oder CH bedeuten, 3 X -Os-(CH2)m- bedeutet, wobei s 0 oder 1 bedeutet und m eine ganze Zahl bedeutet, so dass (m + s) = 0 oder 1 bis 4,

38 EP 1 669 350 B1

1 2 R und R unabhängig ein Wasserstoffatom, ein Halogenatom, eine lineare oder verzweigte C1-6-Alkylgruppe, eine C1-6-Alkoxygruppe oder eine Acetylgruppe, substituiert mit 2 oder 3 Fluoratomen, bedeuten, Y ausgewählt ist aus der Gruppe, bestehend aus:

5 (1) einer Gruppe der Formel (IV):

wobei:

3 R ein Wasserstoffatom oder eine C1-6-Alkylgruppe ist und 20 R4 eine Gruppe der Formel (V) ist:

5 wobei R ein Wasserstoffatom, eine C1-6-Alkylgruppe, eine C3- bis C8-Cycloalkylgruppe, eine Aral- kylgruppe oder eine Heteroarylgruppe bedeutet, n 0 oder eine ganze Zahl von 1 bis 4 bedeutet,

35 (2) einer Gruppe der Formel (IV):

3 wobei R ein Wasserstoffatom oder eine C1-6-Alkylgruppe ist und R4 eine Gruppe der Formel (VI) ist:

50 -(CH2)q-A (VI),

wobei A eine Arylgruppe, eine Heteroarylgruppe, eine kondensierte bicyclische Gruppe aus einer C4- bis C7-Cycloalkylgruppe und einer Arylgruppe oder eine kondensierte bicyclische Gruppe aus einer C4- bis C7-Cycloalkylgruppe und einer Heteroarylgruppe bedeutet, q eine ganze Zahl von 1 bis 3 bedeutet, und 55 (3) einer Gruppe der Formel (IV):

39 EP 1 669 350 B1

10 wobei R3 und R4 eine stickstoffhaltige heterocyclische Gruppe bilden, ausgewählt aus: Piperidinyl, Pyrro- lidinyl, Azetidinyl und Homopiperidinyl, wobei jede dieser Gruppen gegebenenfalls kondensiert ist mit einer Phenyl- oder Pyridylgruppe unter Bildung einer bicyclischen Gruppe, oder ein pharmazeutisch annehmbares Salz davon.

15 2. Die Verbindung nach Anspruch 1, wobei R1 und R2 Wasserstoffatome sind, s 0 ist und m eine ganze Zahl von 1 bis 3 ist.

3. Die Verbindung nach Anspruch 1, wobei X1 und X2 beide CH sind oder eines davon ein Stickstoffatom ist.

20 4. Die Verbindung nach Anspruch 2, wobei X3 eine Piperidinogruppe vervollständigt.

5. Die Verbindung nach Anspruch 1, wobei Y eine Gruppe der Formel (IV) ist:

wobei: 35 3 R ein Wasserstoffatom oder eine C1-6-Alkylgruppe ist und R4 eine Gruppe der Formel (V) ist:

5 wobei R ein Wasserstoffatom, eine C1-6-Alkylgruppe, eine C3- bis C8-Cycloalkylgruppe, eine Aralkylgruppe oder eine Heteroarylgruppe bedeutet, n 0 oder eine ganze Zahl von 1 bis 4 bedeutet. 50 6. Die Verbindung nach Anspruch 1, wobei in Formel (II) Y eine Gruppe der Formel (IV) ist:

40 EP 1 669 350 B1

10 3 wobei R ein Wasserstoffatom oder eine C1-6-Alkylgruppe ist und R4 eine Gruppe der Formel (VI) ist:

-(CH2)q-A (VI), 15

wobei A eine Arylgruppe, eine Heteroarylgruppe, eine kondensierte bicyclische Gruppe aus einer C4- bis C7-Cyclo- alkylgruppe und einer Arylgruppe oder eine kondensierte bicyclische Gruppe aus einer C4- bis C7-Cycloalkylgruppe und einer Heteroarylgruppe bedeutet, und q eine ganze Zahl von 1 bis 3 bedeutet.

20 7. Die Verbindung nach Anspruch 1, wobei Y eine Gruppe der Formel (IV) ist:

wobei R3 und R4 eine stickstoffhaltige heterocyclische Gruppe bilden, ausgewählt aus: Piperidinyl, Pyrrolidinyl, Azetidinyl und Homopiperidinyl.

35 8. Die Verbindung nach Anspruch 7, wobei die stickstoffhaltige heterocyclische Gruppe Piperidinyl ist.

9. Die Verbindung wie in einem der Ansprüche 1 bis 8 beansprucht, wobei die Piperidinderivatverbindung der Formel (I) ist:

40 N-Methyl-N-(1-methylpiperidin-4-yl)-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamid (1), N-(1-Methylpiperidin-4-yl)-4-[4-(piperidin-1-yl)piperidin-1 yl]benzamid (2), N-Methyl-N-(1-cyclobutylpiperidin-4-yl)-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamid (3), N-Methyl-N-(1-cyclopentylpiperidin-4-yl)-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamid (4), N-Methyl-N-(1-cyclohexylpiperidin-4-yl)-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamid (5), 45 N-Methyl-N-(1-cyclohexylmethylpiperidin-4-yl)-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamid (6), N-Methyl-N-[(3R)-1-cyclopentylpyrrolidin-3-yl]-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamid (7), N-Methyl-N-[(3S)-1-cyclopentylpyrrolidin-3-yl)]-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamid (8), N-Methyl-N-[(3R)-1-benzylpyrrolidin-3-yl)]-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamid (9), N-Methyl-N-[(3R)-1-benzylpyrrolidin-3-yl)]-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamid (10), 50 2-{4-(Piperidin-1-yl)piperidin-1-yl]benzoyl-1,2,3,4-tetrahydroisochinolin (12), 1-{4-(Piperidin-1-yl)piperidin-1-yl]benzoyl-1-1,2,3,4-tetrahydrochinolin (13), 1-{4-(Piperidin-1-yl)piperidin-1-yl]benzoyl-4-phenylpiperazin (14), N-Methyl-N-[1-(pyrimidin-2-yl)piperidin-4-yl]-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamid (15), N-Methyl-N-(thiophen-2-yl)methyl-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamid(16), 55 N-Methyl-N-phenethyl-4-[4-(piperidin-1-yl)piperidin-1-yl]benzamid(17), 1-{4-(Piperidin-1-yl)piperidin-1-yl]benzoyl-3-(3,4-difluorphenyl)pyrrolidin (18), 4-{4-(Piperidin-1-yl)piperidin-1-yl]benzoylpiperidin-1-yl (19), N-Methyl-N-(1-methylpiperidin-4-yl)-4-[4-(pyrrolidin-1-yl)piperidin-1-yl]benzamid (20),

41 EP 1 669 350 B1

N-Methyl-N-(1-methylpiperidin-4-yl)-4-[4-(azetidin-1-yl)piperidin-1-yl]benzamid (21), N-Methyl-N-(1-methylpiperidin-4-yl)-5-[4-(piperidin-1-yl)piperidin-1-yl]pyridin-2-carboxamid (22), N-Methyl-N-(1-methylpiperidin-4-yl)-4-[4-(4,4-difluorpiperidin-1-yl)piperidin-1-yl]benzamid (23).

5 10. Eine wie in einem der Ansprüche 1 bis 9 beanspruchte Verbindung zur Verwendung in der Medizin.

11. Eine pharmazeutische Zusammensetzung, die eine wie in einem der Ansprüche 1 bis 9 beanspruchte Verbindung im Gemisch mit einem pharmazeutisch annehmbaren Träger umfasst.

10 12. Die Verwendung einer Verbindung gemäß einem der Ansprüche 1 bis 9 zur Herstellung eines Medikaments zur Behandlung von Stoffwechselsystemerkrankungen wie beispielsweise Adipositas, Diabetes, Hormonsekretionsstö- rung, Hyperlipidämie, Gicht, Fettleber; oder Kreislaufsystemerkrankungen wie beispielsweise Stenokardie, akute/ kongestive Herzinsuffizienz, Myokardinfarkt, koronare Arteriosklerose, Hypertonie, Nephropathie; oder Schlafstö- rung und verschiedenen Erkrankungen, die von Schlafstörung begleitet werden, wie beispielsweise iodopathische 15 Hypersomnie, wiederkehrende Hypersomnie, echte Hypersomnie, Narkolepsie, periodische Akromotionsstörung im Schlaf (sleep periodic acromotion disorder), Schlafapnoe-Syndrom, Tagesrhythmusstörung, chronisches Ermü- dungssyndrom, REM-Schlafstörung, senile Bettflucht, ungesunder Schlaf bei Nachtarbeitern (night worker sleep insanitation), idiopathische Insomnie, wiederkehrende Insomnie, echte Insomnie, Elektrolytstoffwechselstörung; oder zentralen und peripheren Nervensystemerkrankungen wie beispielsweise Bulimie, emotionale Störung, Me- 20 lancholie, Angst, Epilepsie, Delirium, Demenz, Schizophrenie, Aufmerksamkeitsdefizit/Hyperaktivitätsstörung, Ge- dächtnisstörung, Alzheimer-Krankheit, Parkinson-Krankheit, Schlafstörung, Wahrnehmungsstörung, Bewegungs- störung, Parästhesie, Dysosmie, Epilepsie, Morphinresistenz, Suchtmittelabhängigkeit, Alkoholabhängigkeit.

25 Revendications

1. Composé de la formule (I):

dans lequel:

40 X1 et X2 représentent indépendamment un atome d’azote ou CH; 3 X représente -Os-(CH2)m-, où s indique 0 ou 1 et m indique un nombre entier pour faire (m + s) = 0 ou 1 à 4; 1 2 R et R représentent indépendamment un atome d’hydrogène, un atome d’halogène, un groupe alkyle C1-6 linéaire ou ramifié, un groupe alcoxy C1-6 ou un groupe acétyle substitué par 2 ou 3 atomes de fluor; Y est sélectionné parmi le groupe consistant en: 45 (1) un groupe de la formule (IV):

où: 55 3 R est un atome d’hydrogène ou un groupe alkyle C1-6 et R4 est un groupe de la formule (V):

42 EP 1 669 350 B1

5 où R représente un atome d’hydrogène, un groupe alkyle C1-6, un groupe cycloalkyle en C3 àC8,un groupe aralkyle ou un groupe hétéroaryle; n indique 0 ou un nombre entier de 1 à 4;

10 (2) un groupe de la formule (IV):

3 R est un atome d’hydrogène ou un groupe alkyle C1-6 et R4 est un groupe de la formule (VI) 20

-(CH2)q-A (VI)

où A représente un groupe aryle, un groupe hétéroaryle, un groupe bicyclique condensé d’un groupe cycloalkyle en C4 àC7 et d’un groupe aryle ou bien un groupe bicyclique condensé d’un groupe cycloalkyle 25 en C4 à C7 et d’un groupe hétéroaryle; q indique un nombre entier de 1 à 3; et (3) un groupe de la formule (IV):

35 où R3 et R4 forment un groupe hétérocyclique contenant de l’azote sélectionné parmi: pipéridinyle, pyrrolidinyle, azétidinyle et homopipéridinyle, dont l’un quelconque est optionnellement condensé avec un groupe phényle ou pyridyle pour former un groupe bicyclique; ou un sel pharmaceutiquement acceptable de celui-ci.

40 2. Composé selon la revendication 1, dans lequel R1 et R2 sont des atomes d’hydrogène, s est 0 et m est un nombre entier de 1 à 3.

3. Composé selon la revendication 1, dans lequel X1 et X2 sont tous les deux CH ou l’un d’entre eux est un atome d’azote.

45 4. Composé selon la revendication 2, dans lequel X3 complète un groupe pipéridino.

5. Composé selon la revendication 1, dans lequel Y est un groupe de la formule (IV):

55 où:

3 R est un atome d’hydrogène ou un groupe alkyle C1-6 et

43 EP 1 669 350 B1

R4 est un groupe de la formule (V):

5 où R représente un atome d’hydrogène, un groupe alkyle C1-6, un groupe cycloalkyle en C3 àC8, un groupe 10 aralkyle ou un groupe hétéroaryle; n indique 0 ou un nombre entier de 1 à 4.

6. Composé selon la revendication 1, dans lequel dans la formule (II), Y est un groupe de la formule (IV):

20 3 où R est un atome d’hydrogène ou un groupe alkyle C1-6 et R4 est un groupe de la formule (VI)

-(CH2)q-A (VI) 25 où A représente un groupe aryle, un groupe hétéroaryle, un groupe bicyclique condensé d’un groupe cycloalkyle en C4 àC7 et d’un groupe aryle ou bien un groupe bicyclique condensé d’un groupe cycloalkyle en C4 àC7 et d’un groupe hétéroaryle; q indique un nombre entier de 1 à 3.

30 7. Composé selon la revendication 1, dans lequel Y est un groupe de la formule (IV):

où R3 et R4 forment un groupe hétérocyclique contenant de l’azote sélectionné parmi: pipéridinyle, pyrrolidinyle, azétidinyle et homopipéridinyle. 40 8. Composé selon la revendication 7, dans lequel le groupe hétérocyclique contenant de l’azote est un groupe pipé- ridinyle.

9. Composé selon l’une quelconque des revendications 1 à 8, dans lequel le composé dérivé de pipéridine de la 45 formule (I) est:

N-méthyl-N-(1-méthylpipéridin-4-yl)-4-[4-(pipéridin-1-yl)pipéridin-1 - yl]benzamide (1); N-(1-méthylpipéridin-4-yl)-4-[4-(pipéridin-1-yl)pipéridin-1-yl]benzamide (2); N-méthyl-N-(1-cyclobutylpipéridin-4-yl)-4-[4-(pipéridin-1-yl)pipéridin-1-yl]benzamide (3); 50 N-méthyl-N-(1-cyclopentylpipéridin-4-yl)-4-[4-(pipéridin-1-yl)pipéridin-1 - yl]benzamide (4); N-méthyl-N-(1-cyclohexylpipéridin-4-yl)-4-[4-(pipéridin-1-yl)pipéridin-1 - yl]benzamide (5); N-méthyl-N-(1-cyclohexylméthylpipéridin-4-yl)-4-[4-(pipéridin-1-yl)pipéridin-1-yl]benzamide (6); N-méthyl-N-[(3R)-1-cyclopentylpyrrolidin-3-yl)-4-[4-(pipéridin-1-yl)pipéridin-1-yl]benzamide (7); N-méthyl-N-[(3S)-1-cyclopentylpyrrolidin-3-yl)-4-[4-(pipéridin-1-yl)pipéridin-1-yl]benzamide (8); 55 N-méthyl-N-[(3R)-1-benzylpyrrolidin-3-yl)-4-[4-(pipéridin-1-yl)pipéridin-1-yl]benzamide (9); N-méthyl-N-[(3R)-1-benzylpyrrolidin-3-yl)-4-[4-(pipéridin-1-yl)pipéridin-1-yl]benzamide (10); 2-{4-(pipéridin-1-yl)pipéridin-1-yl]benzoyl-1,2,3,4-tétrahydroisoquinoline (12); 1-{4-(pipéridin-1-yl)pipéridin-1-yl]benzoyl-1,2,3,4-tétrahydroquinoline (13);

44 EP 1 669 350 B1

1-{4-(pipéridin-1-yl)pipéridin-1-yl]benzoyl-4-phénylpipérazine (14); N-méthyl-N-[1-pyrimidin-2-yl)pipéridin-4-yl]-4-[4-(pipéridin-1-yl)pipéridin-1-yl]benzamide (15); N-méthyl-N-(thiophen-2-yl)méthyl-4-[4-(pipéridin-1-yl)pipéridin-1-yl]benzamide (16); N-méthyl-N-phénéthyl-4-[4-(pipéridin-1-yl)pipéridin-1-yl]benzamide (17); 5 1-{4-(pipéridin-1-yl)pipéridin-1-yl]benzoyl-3 -(3,4-difluorophényl)pyrrolidine (18); 4-{4-(pipéridin-1-yl)pipéridin-1-yl]benzoylpipéridin-1-yle (19); N-méthyl-N-(1-méthylpipéridin-4-yl)-4-[4-(pirrolidin-1-yl)pipéridin-1-yl]benzamide (20); N-méthyl-N-(1-méthylpipéridin-4-yl)-4-[4-(azétidin-1-yl)pipéridin-1-yl]benzamide (21); N-méthyl-N-(1-méthylpipéridin-4-yl)-5-[4-(pipéridin-1-yl)pipéridin-1-yl]pyridine-2-carboxamide (22); 10 N-méthyl-N-(1-méthylpipéridin-4-yl)-4-[4-(4,4-difluoropipéridin-1-yl)pipéridin-1-yl]benzamide (23).

10. Composé selon l’une quelconque des revendications 1 à 9, à utiliser en médecine.

11. Composition pharmaceutique qui comprend un composé selon l’une quelconque des revendications 1 à 9 en mé- 15 lange avec un véhicule pharmaceutiquement acceptable.

12. Utilisation d’un composé selon l’une quelconque des revendications 1 à 9, dans la fabrication d’un médicament pour le traitement de maladies du système métabolique telles qu’obésité, diabètes, trouble de sécrétion hormonale, hyperlipidémie, goutte, stéatose hépatique ou troubles du système circulatoire, par exemple sténocardie, insuffi- 20 sance cardiaque aiguë/congestive, infarctus cardiaque, artériosclérose coronaire, hypertension, néphropathie ou trouble du sommeil et diverses maladies accompagnées de trouble du sommeil telles qu’hypersomnie idiopathique, hypersomnie répétitive, hypersomnie vraie, narcoplepsie, trouble du sommeil avec mouvement périodique des extrémités, syndrome d’apnée du sommeil, trouble du rythme circadien, syndrome de fatigue chronique, trouble du sommeil MOR, insomnie sénile, troubles du sommeil des travailleurs de nuit, insomnie idiopathique, insomnie 25 répétitive, insomnie vraie, trouble du métabolisme électrolytique ou maladies du système nerveux central et péri- phérique telles que boulimie, trouble émotif, mélancolie, anxiété, épilepsie, délire, démence, schizophrénie, trouble de déficit de l’attention/hyperactivité, trouble de la mémoire, maladie d’Alzheimer, maladie de Parkinson, trouble du sommeil, trouble de la reconnaissance, trouble du mouvement, paresthésie, dysosmie, épilepsie, morpholino- résistance, dépendance narcotique, dépendance alcoolique. 30

45 EP 1 669 350 B1

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