NOVEL N-AMINOALKYL-1-BIPHENYLENYL-2-CARBOXAMIDES; NEW DOPAMINE RECEPTOR SUBTYPE SPECIFIC LIGANDS

Abstract: Disclosed are compounds of formula (I) or the pharmaceutically acceptable acid addition salts thereof wherein: R1, R2, R3, R4, R5, R6 and R7 independently represent hydrogen, halogen, hydroxy, alkyl, alkoxy, amino, aminosulfonyl, alkylaminosulfonyl, dialkylaminosulfonyl, cyano, nitro, trifluoromethyl, or trifluoromethoxy; R8 is hydrogen or lower alkyl; X represents an optionally substituted alkylene group; and Y represents a mono-, di- or trisubstituted cyclic amino group, which compounds are useful in the treatment of affective disorders such as schizophrenia, depression, Alzheimer's disease, movement disorders such as Parkinsonism and dystonia, and other disorders which responds to dopaminergic blockade such as substance abuse and obsessive compulsive disorders. Further, compounds of this invention may be useful in treating the extrapyramidal side effects associated with the use of conventional neuroleptic agents.

Description: Novel N-Aminoalkyl-l-biphenyIenyl-2-carboxamides; New Dopamine Receptor Subtype Specific Ligands BACKGROUND OF THE INVENTION Field of the invention This invention relates to biphenylenyl-2-carboxamide derivatives which selectively bind to brain dopamine receptor subtypes. More specifically, it relates to N- Aminoalkyl- 1- biphenylenyl-2-carboxarnides and to pharmaceutical compositions comprising such compounds. It further relates to the use of such compounds in the treatment or prevention of various neuropsychochological disorders such as schizophrenia and other central nervous system diseases. Description of the Related Art The therapeutic effect of conventional antipsychotics, known as neuroleptics, is generally believed to be exerted through blockade of dopamine receptors. However, neuroleptics are frequently responsible for undesirable extrapyramidal side effects (EPS) and tardive dyskinesias, which are attributed to blockade of D2 receptors in the striatal region of the brain. The dopamine D3 receptor subtype has recently been identified (Sokoloff et al., Nature, 347. 146 (1990)). Its unique localization in limbic brain areas and its differential recognition of various antipsychotics suggest that the D3 receptor may play a major role in the etiology of schizophrenia. Selective D3 antagonists may be effective antipsychotics free from the neurological side effects displayed by conventional neuroleptics. Compounds of the present invention demonstrate high affinity and selectivity in binding to the D3 receptor subtype. They may be of potential use in treatment of schizophrenia, psychotic depression and mania. Other dopamine-mediated diseases such as Parkinsonism and tardive dyskinesias may also be treated directly or indirectly by modulation of D3 receptors. U.S. Patent No. 5,395,835 discloses N-aminoalkyl-2-napthalamides which have affinity at dopamine D3 receptors. Murray et al., Bioorg. Med. Chem. Let. 5 219 (1995), describe 4- carboxamidobiphenyls said to have affinity at dopamine D3 receptors. 7/06210 SUMMARY OF THE INVENTION This invention provides novel compounds of Formula I which interact with dopamine receptor subtypes. Thus, the invention provides compounds of general Formula I useful in the treatment and/or prevention of various neuropsychological disorders. The invention also provides pharmaceutical compositions compπsing compounds of Formula I The invention further relates to the use of such compounds and compositions in the treatment of affective disorders such as schizophrenia, depression, Alzheimer's disease and certain movement disorders such as Parkinsonism and dystoma. Compounds of this invention are also useful in treating the extrapyramidal side effects associated with the use of conventional neuroleptic agents. Further, the compounds of the present invention are useful for the treatment of other disorders which respond to dopaminergic blockade such as substance abuse and obsessive compulsive disorder. Since dopamine D 3 receptors are concentrated in the limbic system (Taubes, Science, 265: 1034 (1994)) which controls cognition and emotion, compounds which interact with these receptors also have utility in the treatment of cognitive disorders. Such disorders include cognitive deficits which are a significant component of the negative symptoms (social withdrawal and unresponsiveness) of schizophrenia. Other disorders involving memory impairment or attention deficit disorders can also be treated with the compounds of this invention which interact specifically with the dopamine D 3 receptor subtype. Furthermore, compounds of this invention may be useful m treatment of depression, memory-impairment or Alzheimer's disease by modulation of D3 receptors which selectively exist in limbic area known to control emotion and cognitive functions. The compounds of the present invention are also useful for the treatment of other disorders which respond to dopaminergic blockade such as substance abuse (Caine and Koob, Science, 260: 1814 (1993)) and obsessive compulsive disorder (Goodman et al., Clm. Psychopharmacol., 2- 35 (1992). The compounds of the invention interact of with dopamine receptor subtypes resultmg in the pharmacological activity of these compounds. Accordingly, a broad embodiment of the invention is directed to a compound of Formula I: I or the pharmaceutically acceptable acid addition salts thereof wherein: Ri, R 2 , R 3 , R4, R 5 , R $ , and R 7 are the same or different and represent hydrogen, halogen, hydroxy, amino, ammosulfonyl, alkylaminosulfonyl, diaUcylaminosulfonyl, cyano, nitro, trifluoromethyl, trifluoromethoxy, alkyl or alkoxy; Rg is hydrogen or lower alkyl; X represents an alkylene group of 2 to 6 carbon atoms optionally substituted with one or more alkyl groups having from 1 to 4 carbon atoms; Y represents a group of the formula: where R 9 and Rio independently represent alkyl; Z is N, CH or COH; and W is phenyl or 1- or 2- naphthyl each of which is optionally substituted with up to five substituents independently selected from hydrogen, halogen, alkyl, alkoxy, thioalkoxy, hydroxy, amino, alkylamino or dialkylamino; l-(l,2,3,4-tetrahydro)napthyl or l-(l,2-dihydro)indenyl; 2-, 3-, or 4-pyridinyl; 2-, 4-, or 5-pyrimidinyl optionally substituted with halogen; 1-, 3-, or 8-isoquinolinyl; 7 -benzofuranyl; or 7-benzothienyl. Thus, the invention relates to the use of compounds of Formula I m the treatment and/or prevention of neuropsychochological disorders including, but not limited to, schizophrema, Alzheimer's disease, mania, dementia, depression, anxiety, compulsive behavior, substance abuse, memory impairment, cognitive deficits, Parkinson-like motor disorders such as dystoma, and motion disorders and extrapyramidal side effects related to the use of neuroleptic agents. DETAILED DESCRIPTION OF THE INVENTION In addition to compounds of general Formula I described above, the invention encompasses compounds of general formula LA/. IΔ wherein Ri, R 2 , R 3 , R4, R 5 , R$, R 7 , Rg, X, Z, W and R9 and Rio are as defined above for Formula I. Preferred compounds of formula IA include those where R1-R7 are hydrogen and X is alkylene of 3-5 carbon atoms. In addition, the invention encompasses compounds of Formula IB: m wherein Re, X, Z, W and R9 and Rio are as defined above for Formula I. Preferred compounds of formula IB include those where Rs is hydrogen and X is alkylene of 3-5 carbon atoms. Particularly preferred compounds of Formula Lfi are those where R8 is hydrogen and X is butylene, i.e., C4 alkylene. The present invention further encompasses compounds of Formula II: II wherein Rs, X, Z, and W are as defined above for Formula I. Preferred compounds of formula II include those where Z is nitrogen, Rs is hydrogen and X is alkylene of 3-5 carbon atoms. Particularly preferred compounds of Formula II are those where Rs is hydrogen, X is butylene, i.e., C4 alkylene, and Z is nitrogen. In other preferred compounds of Formula II, Z is nitrogen, Rs is hydrogen and X is aUcylene of 3-5 carbon atoms, and W is dihydroindenyl, quinolinyl, isoquinolinyl, phenyl or naphthyl, each of which is optionally substituted with up to three groups independently selected from halogen, C1-C6 alkyl, C1-C4 alkoxy, and hydroxy. The invention also provides compounds of Formula III: in wherein Rs, X, and W are as defined above for Formula I. Preferred compounds of formula IH include those where Rs is hydrogen and X is aUcylene of 3-5 carbon atoms. Particularly preferred compounds of Formula m are those where Rs is hydrogen, and X is butylene, i.e., C4 alkylene. In other preferred compounds of Formula HL Rs is hydrogen, X is alkylene of 3-5 carbon atoms, and W is dihydroindenyl, quinolinyl, isoquinolinyl, phenyl or naphthyl, each of which is optionally substituted with up to three groups independently selected from halogen, C1-C6 alkyl, C1-C4 alkoxy, and hydroxy. Preferred compounds ofthe invention include W groups selected from the following: In the above W groups, the following definitions apply: R a is halogen; Rb represents alkoxy; Re represents alkyl; Rd represents hydrogen, Ra or Re- In those formulas where more than one of the same substituent appears, those substituents are the same or different. The most preferred compounds of Formula m are those having the preferred W groups described immediately above. Particularly preferred W groups of the invention include 2-methoxyphenyl; 2,3- Dimethylphenyl; 1-Napthyl; 1-Isoquinolyl; 1,2-Dihydroindenyl; 8-Quinolinyl; 2- Chlorophenyl; 2,3-Dichlorophenyl; 2,6-Dimethylphenyl; 2,6-Dichlorophenyl; 2-Methyl-3- chlorophenyl; and 2-Methylphenyl. When a compound of the invention is obtained as a mixture of enantiomers, these enantiomers may be separated, when desired, by conventional methods such as crystallization in the presence of a resolving agent, or chromatography, for example using a chiral HPLC column. Representative compounds of the present invention, which are encompassed by Formula I, include, but are not limited to the compounds in Figure I and their pharmaceutically acceptable salts. The present invention also encompasses prodrugs, such as acylated prodrugs, of the compounds of Formula I Those skilled in the art will recognize vanous synthetic methodologies which may be employed to prepare non-toxic pharmaceutically acceptable addition salts and prodrugs of the compounds encompassed by Formula L Representative compounds of the present invention, which are encompassed by Formula L include, but are not limited to the compounds in Table 1 and their pharmaceutically acceptable salts. Non-toxic pharmaceutically acceptable salts mclude salts of acids such as hydrochloric, phosphoric, hydrobromic, sulfuric, sulfinic, formic, toluenesulfonic, methanesulfonic, nitric, benzoic, citric, tartaric, maleic, hydroiodic, alkanoic such as acetic, HOOC-(CH2)n-COOH where n is 0-4, and the like. Those skilled in the art will recognize a wide variety of non-toxic pharmaceutically acceptable addition salts. As used herein, the terms aminosulfonyl, alkylaminosulfonyl, and dialkylammosulfonyl refer, respectively, to groups ofthe formulas: O R O R O II *s || "X II H 2 N— S — N-S — N— S — O H O Rb O where Ra and Rb are independently selected from alkyl groups. By "alkyl" and "lower alkyl" is meant straight and branched chain alkyl groups having from 1-6 carbon atoms, e.g., Ci-Cό alkyl. By "lower alkoxy" and "alkoxy" is meant straight and branched chain alkoxy groups having from 1-6 carbon atoms, e.g., Ci-Cό alkoxy. By halogen is meant fluorine, chlorine, bromine and iodine. The amino portion of the aminoalkyl group represented by Y above includes groups represented by the formulas : where W is defined above. Particularly preferred W groups of the invention are dihydroindenyl, quinolinyl, isoquinolinyl, or phenyl, where phenyl is optionally substituted with up to two substituents independently selected from halogen, C1-C4 alkyl, and C1-C4 alkoxy. These optional phenyl substituents are preferably in the 2 and/or 3 positions of the phenyl group relative to the point of attachment ofthe phenyl group to the 6-membered nitrogen containing ring. Representative examples of compounds according to the invention are shown in Table 1 below. The number below each compound is its compound number. Each of these compounds may be prepared according to the general reaction Scheme I set forth below. Compounds 1-5 in Table 1 have the following general formula A: A where R and Rs are defined in the table. Table 1 Comound Number Rs R The invention also pertains to the use of compounds of general Formula I in the treatment of neuropsychological disorders. The pharmaceutical utility of compounds of this invention are indicated by the following assays for dopamine receptor subtype affinity. ASSAY FOR D2 AND D^ RECEPTOR BINDING ACTIVITY Pellets of COS cells containing recombinantly produced D2 or D3 receptors from African Green monkey were used for the assays. The sample is homogenized in 100 volumes (w/vol) of 0.05 M Tris HCl buffer at 4° C and pH 7.4. The sample is then centrifuged at 30,000 x g and resuspended and rehomogenized. The sample is then centrifuged as described and the final tissue sample is frozen until use. The tissue is resuspended 1 :20 (wt/vol) in 0.05 M Tris HCl buffer containing 100 mM NaCl. Incubations are carried out at 48°C and contain 0.4 ml of tissue sample, 0.5 nM ^H- YM 09151-2 and the compound of interest in a total incubation of 1.0 ml. Nonspecific binding is defined as that binding found in the presence of 1 mM spiperone; without further additions, nonspecific binding is less than 20% of total binding. The binding characteristics of representative compounds of the invention for D2 and D3 receptor subtypes are shown in Table 2 for rat striatal homogenates. TABLE 2 Compound Number 1 D2 Kj (nM) D3 Kj (nM) 1 323 5 3 138 3 4 >100 15 1 Compound numbers relate to compounds shown above in Table 1. The compounds of general Formula I may be administered orally, topically, parenterally, by inhalation or spray or rectally in dosage unit formulations containing conventional non-toxic pharmaceutically acceptable carriers, adjuvants and vehicles. The term parenteral as used herein includes subcutaneous injections, intravenous, intramuscular, intrasternal injection or infusion techniques. In addition, there is provided a pharmaceutical formulation comprising a compound of general Formula I and a pharmaceutically acceptable carrier. One or more compounds of general Formula I may be present in association with one or more non-toxic pharmaceutically acceptable carriers and/or diluents and/or adjuvants and if desired other active ingredients. The pharmaceutical compositions containing compounds of general Formula I may be in a form suitable for oral use, for example, as tablets, troches, lozenges, aqueous or oily suspensions, dispersible powders or granules, emulsion, hard or soft capsules, or syrups or elixirs. Compositions intended for oral use may be prepared according to any method known to the art for the manufacture of pharmaceutical compositions and such compositions may contain one or more agents selected from the group consisting of sweetening agents, flavoring agents, colonng agents and preserving agents in order to provide pharmaceutically elegant and palatable preparations. Tablets contain the active ingredient in admixture with non-toxic pharmaceutically acceptable excipients which are suitable for the manufacture of tablets. These excipients may be for example, inert diluents, such as calcium carbonate, sodium carbonate, lactose, calcium phosphate or sodium phosphate; granulating and disintegrating agents, for example, corn starch, or algmic acid; binding agents, for example starch, gelatin or acacia, and lubncating agents, for example magnesium stearate, steaπc acid or talc. The tablets may be uncoated or they may be coated by known techniques to delay disintegration and absoφtion in the gastrointestinal tract and thereby provide a sustained action over a longer period. For example, a time delay matenal such as glyceryl monosterate or glyceryl distearate may be employed. Formulations for oral use may also be presented as hard gelatin capsules wherein the active ingredient is mixed with an inert solid diluent, for example, calcium carbonate, calcium phosphate or kaolin, or as soft gelatin capsules wherein the active ingredient is mixed with water or an oil medium, for example peanut oil, liquid paraffin or olive oil. Aqueous suspensions contain the active materials in admixture with excipients suitable for the manufacture of aqueous suspensions. Such excipients are suspending agents, for example sodium carboxymethylcellulose, methylcellulose, hydropropyl methylcellulose, sodium alginate, polyvinylpyrrolidone, gum tragacanth and gum acacia; dispersing or wetting agents may be a naturally-occurring phosphatide, for example, lecithin, or condensation products of an alkylene oxide with fatty acids, for example polyoxyethylene stearate, or condensation products of ethylene oxide with long chain aliphatic alcohols, for example heptadecaethyleneoxycetanol, or condensation products of ethylene oxide with partial esters denved from fatty acids and a hexitol such as polyoxyethylene sorbitol monooleate, or condensation products of ethylene oxide with partial esters denved from fatty acids and hexitol anhydπdes, for example polyethylene sorbitan monooleate. The aqueous suspensions may also contain one or more preservatives, for example ethyl, or n-propyl p- hydroxybenzoate, one or more colonng agents, one or more flavonng agents, and one or more sweetening agents, such as sucrose or sacchann. Oily suspensions may be formulated by suspending the active ingredients in a vegetable oil, for example arachis oil, olive oil, sesame oil or coconut oil, or in a mineral oil such as liquid paraffin. The oily suspensions may contain a thickening agent, for example beeswax, hard paraffin or cetyl alcohol. Sweetening agents such as those set forth above, and flavoring agents may be added to provide palatable oral preparations. These compositions may be preserved by the addition of an anti-oxidant such as ascorbic acid. Dispersible powders and granules suitable for preparation of an aqueous suspension by the addition of water provide the active ingredient in admixture with a dispersing or wetting agent, suspending agent and one or more preservatives. Suitable dispersing or wetting agents and suspending agents are exemplified by those already mentioned above. Additional excipients, for example sweetening, flavoring and coloring agents, may also be present. Pharmaceutical compositions of the invention may also be in the form of oil-in-water emulsions. The oily phase may be a vegetable oil, for example olive oil or arachis oil, or a mineral oil, for example liquid paraffin or mixtures of these. Suitable emulsifying agents may be naturally-occurring gums, for example gum acacia or gum tragacanth, naturally-occurring phosphatides, for example soy bean, lecithin, and esters or partial esters derived from fatty acids and hexitol, anhydrides, for example sorbitan monoleate, and condensation products of the and partial esters with ethylene oxide, for example polyoxyethylene sorbitan monoleate. The emulsions may also contain sweetening and flavoring agents. Syrups and elixirs may be formulated with sweetening agents, for example glycerol, propylene glycol, sorbitor or sucrose. Such formulations may also contain a demulcent, a preservative and flavoring and coloring agents. The pharmaceutical compositions may be in the form of a sterile injectable aqueous or oleaginous suspension. This suspension may be formulated according to the known art using those suitable dispersing or wetting agents and suspending agents which have been mentioned above. The sterile injectable preparation may also be sterile injectable solution or suspension in a non-toxic parentally acceptable diluent or solvent, for example as a solution in 1,3-butanediol. Among the acceptable vehicles and solvents that may be employed are water, Ringer's solution and isotonic sodium chloride solution. In addition, sterile, fixed oils are conventionally employed as a solvent or suspending medium. For this purpose any bland fixed oil may be employed including synthetic mono or diglycerides. In addition, fatty acids such as oleic acid find use in the preparation of injectables. The compounds of general Formula I may also be administered in the form of suppositories for rectal administration of the drug. These compositions can be prepared by mixing the drug with a suitable non-irritating excipient which is solid at ordinary temperatures but liquid at the rectal temperature and will therefore melt in the rectum to release the drug. Such materials are cocoa butter and polyethylene glycols. Compounds of general Formula I may be administered parenterally in a sterile medium. The drug, depending on the vehicle and concentration used, can either be suspended or dissolved in the vehicle. Advantageously, adjuvants such as local anesthetics, preservatives and buffering agents can be dissolved in the vehicle. Dosage levels ofthe order of from about 0.1 mg to about 140 mg per kilogram of body weight per day are useful in the treatment of the above-indicated conditions (about 0.5 mg to about 7 g per patient per day). The amount of active ingredient that may be combined with the carrier materials to produce a single dosage form will vary depending upon the host treated and the particular mode of administration. Dosage unit forms will generally contain between from about 1 mg to about 500 mg of an active ingredient. It will be understood, however, that the specific dose level for any particular patient will depend upon a variety of factors including the activity of the specific compound employed, the age, body weight, general health, sex, diet, time of administration, route of administration, and rate of excretion, drug combination and the severity of the particular disease undergoing therapy. Preparation of N- Alkylamino- 1 -biphenylene-2-carboxamides The compounds of Formula I, and the pharmaceutically acceptable acid addition salts thereof, may be prepared according to the reactions shown below in Scheme 1. Scheme 1 wherein K\, R2, R3, R4, R5, R6, R7 > R8» and X and Y are as defined above for Formula L As shown, a compound of Formula B may be activated by an acitivating agent such as l,r-carbonyldiimidazole (CDI) or the like in a suitable solvent such as tetrahydrofuran at room temperature. The resulting activated species may be subsequently reacted with the required compound of Formula C_ to afford a compound of Formula I as the desired product. Where they are not commercially available, the compounds of Formula B_ may be prepared by literture procedures or procedures analogous to those described in literature. The compounds of Formula C_ are either known or capable of being prepared by various methods known in the art. Example 1 below provides a representative preparation of a compound of Formula Q. A specific example of a preparation of a compound according to the invention is as follows: Those having skill in the art will recognize that the starting matenals may be vaned and additional steps employed to produce compounds encompassed by the present invention, as demonstrated by the following examples. In some cases protection of certain reactive functionalities may be necessary to achieve some of the above transformations. In general the need for such protecting groups will be apparent to those skilled in the art of organic synthesis as well as the conditions necessary to attach and remove such groups. The disclosures in this application of all articles and references, including patents, are incoφorated herein by reference. The invention is illustrated further by the following examples which are not to be construed as limiting the invention in scope or spirit to the specific procedures described in them. These examples illustrate the presently preferred methods for preparing the compounds ofthe invention. Example I 1 -(2-MethoxyphenylV4- 14-fN-f 1 -biphenylene-2-carboxamido ' )l butyl ) piperazine L l-(2-methoxyphenyl)-4-(4-aminobutvDpiperazine Powdered potassium carbonate (22 g) was added to a solution of l-(2- methoxyphenyl)piperazine (14 g, 0.073 mmol) and N-(4-bromobutyl)phthalimide (20 g, 0.070 mmol) in 200 mL of dimethylformamide and the resulting mixture was stirred and heated at 80 °C for 28 h. After cooling to room temperature the mixture was partitioned between water (500 ml) and diethyl ether (500 ml). The organic layer was further washed with two 200 mL portions of water, dried (Na 2 SO 4 ) and concentrated. The resulting white solid was recrystallized from isopropanol to give 12 g of white crystals. The solid material was placed in hydrazine hydrate (150 mL) and heated to reflux under a nitrogen atmosphere. After 3 h the reaction was cooled and poured partitioned between water (400 mL) and diethyl ether (200 mL). Potassium carbonate (60 g) was added to the water layer and the resulting solution was extracted with methylene chloride (200 ml). The combined organic extracts were dried (Na 2 SO 4 ) and concentrated to give l-(2-methoxyphenyl)-4-(4-aminobutyl)piperazine as a pale yellow oil (8.7 g). 2. l-(2-methoxyphenyl)-4-(4-(N-(l-biphenylene- 2-carboxamidott butvnpiperazine A mixture of biphenylene-2 -carboxylic acid (100 mg, 0.58 mmol) and carbonyl diimidazole (68 mg) in 10 ml of anhydrous tetrahydrofuran was stirred for 8h. A solution of - (2-methoxyphenyl)-4-(4-aminobutyl)piperazine (152 mg) in 1 ml of tetrahydrofuran (1 ml) was added and the resulting mixture was stirred for 30 min. The reaction mixture was partitioned between ethyl acetate and water. The organic layer was washed with water, dried (Na 2 S0 4 ) and concentrated to give l-(2-methoxyphenyl)-4-(4-(N-(l-biphenylene-2- carboxamido)) butyl)piperazine (100 mg). Example 2 The following compounds are prepared essentially according to the procedures set forth above. (a) l-(2,3-Dimethylphenyl)-4-{4-[N-(l-biphenylene-2- carboxamido)]butyl} piperazine dihydrochloride (Compound 2, m.p. 229-231 °C). (b) 1 -( 1 -Napthyl)-4- {4-[N-( 1 -biphenylene-2-carboxamido)]butyl}piperazine dihydrochloride (Compound 3, m.p. 223-225 °C dec). (c) 1 -( 1 -Isoquinolyl)-4- {4-[N-( 1 -biphenylene-2-carboxamido)]buty 1 } piperazine dihydrochloride (Compound 4). (d) 1 -( 1 -( 1 ,2-Dihydroindenyl)-4- {4-[N-( 1 -biphenylene-2- carboxamido)]butyl}piperazine dihydrochloride (Compound 5, m.p. 244-246 °C). (e) l-(8-Quinolinyl)-4-{4-[N-(l-biphenylene-2-carboxamido)]butyl}piperazine dihydrochloride (m.p. 204-207 °C). (f) 1 -(2-Chloropheny l)-4- { 4- [N-( 1 -biphenylene-2-carboxamido)]buty 1 } piperazine (m.p. 139-141 °C). (g) 1 -(2,3-Dichlorophenyl)-4- {4-[N-( 1 -biphenylene-2- carboxamido)]butyl} piperazine (m.p. 162-164 °C). (h) l-(2,6-Dimethylρhenyl)-4-{4-[N-(l-biρhenylene-2- carboxamido)]butyl } piperazine dihydrochloride. (i) 1 -(2,6-Dichlorophenyl)-4- {4-[N-( 1 -biphenylene-2- carboxamido)]butyl}piperazine. (j) I -(2-Methyl-3-chlorophenyl)-4- {4-[N-( 1 -biphenylene-2-carboxamido)]butyl } - piperazine. (k) 1 -(2-Methylphenyl)-4- {4-[N-( 1 -biphenylene-2- carboxamido)]pentyl} piperazine dihydrochloride (m.p. 221-223 °C). The invention and the manner and process of making and using it, are now described in such full, clear, concise and exact terms as to enable any person skilled in the art to which it pertains, to make and use the same. It is to be understood that the foregoing describes preferred embodiments of the present invention and that modifications may be made therein without departing from the spirit or scope of the present invention as set forth in the claims. To particularly point out and distinctly claim the subject matter regarded as invention, the following claims conclude this specification.

Claims: What is claimed is: 1. A compound of the formula: or the pharmaceutically acceptable acid addition salts thereof wherein: Ri, R 2 , R 3 , R4, Rs, R 6 , and R 7 are the same or different and represent hydrogen, halogen, hydroxy, amino, aminosulfonyl, alkylaminosulfonyl, diaUcylaminosulfonyl, cyano, nitro, trifluoromethyl, trifluoromethoxy, alkyl or alkoxy; Rg is hydrogen or lower alkyl; X represents an aUcylene group of 2 to 6 carbon atoms optionally substituted with one or more alkyl groups having from 1 to 4 carbon atoms; Y represents a group ofthe formula: R 9 — N Z— W R-to where R 9 and Rio independently represent alkyl; Z is N, CH or COH; and W is phenyl or 1- or 2- naphthyl each of which is optionally substituted with up to five substituents independently selected from hydrogen, halogen, alkyl, alkoxy, thioalkoxy, hydroxy, amino, alkylamino or dialkylamino; 1 -( 1 ,2,3 ,4-tetrahydro)napthy 1 or 1 -( 1 ,2-dihydro)indenyl; 2-, 3-, or 4-pyridinyl; 2-, 4-, or 5-pyrimidinyl optionally substituted with halogen; 1-, 3-, or 8-isoquinolinyl; 7 -benzofuranyl; or 7-benzothienyl. A compound ofthe formula: wherein Rs is hydrogen or lower alkyl; X represents an aUcylene group of 2 to 6 carbon atoms optionally substituted with one or more alkyl groups having from 1 to 4 carbon atoms; R 9 and Rι 0 independently represent alkyl; Z is N, CH or COH; and W is phenyl or 1- or 2- naphthyl each of which is optionally substituted with up to five substituents independently selected from hydrogen, halogen, alkyl, alkoxy, thioalkoxy, hydroxy, amino, alkylamino or dialkylamino; 1 -( 1 ,2,3 ,4-tetrahydro)napthyl or 1 -( 1 ,2-dihydro)indenyl; 2-, 3-, or 4-pyridinyl; 2-, 4-, or 5-p-yτimidinyl optionally substituted with halogen; 1-, 3-, or 8-isoquinolinyl; 7 -benzofuranyl; or 7-benzothienyl. 3. A compound according to Claim 2, wherein R8 is hydrogen and X is alkylene of 3-5 carbon atoms. A compound ofthe formula: wherein Rs is hydrogen or lower alkyl; X represents an aUcylene group of 2 to 6 carbon atoms optionally substituted with one or more alkyl groups having from 1 to 4 carbon atoms; Z is N, CH or COH; and W is phenyl or 1- or 2- naphthyl each of which is optionally substituted with up to five substituents independently selected from hydrogen, halogen, alkyl, alkoxy, thioalkoxy, hydroxy, amino, alkylamino or dialkylamino; l-(l,2,3,4-tetrahydro)naρthyl or l-(l,2-dihydro)indenyl; 2-, 3-, or 4-pyridinyl; 2-, 4-, or 5-pyriιnidinyl optionally substituted with halogen; 1-, 3-, or 8-isoquinolinyl; 7 -benzofuranyl; or 7-benzothienyl. 5. A compound according to Claim 4, wherein Z is nitrogen, Rs is hydrogen and X is alkylene of 3-5 carbon atoms. 6. A compound according to Claim 4, wherein Z is nitrogen, Rs is hydrogen, X is alkylene of 3-5 carbon atoms, and W is dihydroindenyl, quinolinyl, isoquinolinyl, phenyl or naphthyl, each of which is optionally substituted with up to three groups independently selected from halogen, Ci-Cό alkyl, C1-C4 alkoxy, and hydroxy. 7. A compound ofthe formula wherein Rg is hydrogen or lower alkyl; X represents an aUcylene group of 2 to 6 carbon atoms optionally substituted with one or more alkyl groups having from 1 to 4 carbon atoms; and W is phenyl or 1- or 2- naphthyl each of which is optionally substituted with up to five substituents independently selected from hydrogen, halogen, alkyl, alkoxy, thioalkoxy, hydroxy, amino, alkylamino or dialkylamino; l-(l,2,3,4-tetrahydro)napthyl or l-(l,2-dihydro)indenyl; 2-, 3-, or 4-pyridinyl; 2-, 4-, or 5-pyrimidinyl optionally substituted with halogen; 1-, 3-, or 8-isoquinolinyl; 7-benzofuranyl; or 7-benzothienyl. 8. A compound according to Claim 7, wherein Rs is hydrogen and X is aUcylene of 3-5 carbon atoms. 9. A compound according to Claim 7, wherein Rs is hydrogen, and X is butylene. 10. A compound according to Claim 7, wherein Rg is hydrogen, X is aUcylene of 3-5 carbon atoms, and W is dihydroindenyl, quinolinyl, isoquinolinyl, phenyl or naphthyl, each of which is optionally substituted with up to three groups independently selected from halogen, C l -Ce alkyl, C l -C4 alkoxy, and hydroxy. 11. A compound according to Claim 10, wherein X is butylene. 12. A compound according to Claim 1, which is l-(2-methoxyphenyl)-4-{4-[N-(l- biphenylene-2-carboxamido)]butyl} piperazine. 13. A compound according to Claim 1, which is l-(2,3-dimethylphenyl)-4-{4-[N- ( 1 -biphenylene-2-carboxamido)]butyl} piperazine dihydrochloride. 14. A compound according to Claim 1, which is l-(l-napthyl)-4-{4-[N-(l- biphenylene-2-carboxamido)]butyl} piperazine dihydrochloride. 15. A compound according to Claim I, which is l-(l-isoquinolyl)-4-{4-[N-(l- bipheny lene-2-carboxamido)]butyl } piperazine dihydrochloride. 16. A compound according to Claim 1, which is l-{l-(l,2-dihydroindenyl)-4-[4- (N-( 1 -bipheny lene-2-carboxamido) ]butyl } piperazine dihydrochloride. 17. A compound according to Claim 1, which is l-(8-quinolinyl)-4-{4-[N-(l- biphenylene-2-carboxamido)]butyl } piperazine. 18. A compound according to Claim 1, which is l-(2-chlorophenyl)-4-{4-[N-(l- biphenylene-2-carboxamido)]butyl}piperazine. 19. A compound according to Claim 1, which is l-(2,3-dichlorophenyl)-4-{4-[N- (l-biphenylene-2-carboxamido)]butyl}piperazine. 20. A compound according to Claim 1, which is l-(2,6-dimethylphenyl)-4-{4-[N- ( 1 -biphenylene-2-carboxamido)]butyl}piρerazine dihydrochloride. 21. A compound according to Claim 1, which is l-(2,6-dichlorophenyl)-4-{4-[N- ( 1 -biphenylene-2-carboxamido)]butyl } piperazine. 22. A compound according to Claim 1, which is l-(2-methyl-3-chlorophenyl)-4- {4-[N-( 1 -biphenylene-2-carboxamido)]butyl} piperazine. 23. A compound according to Claim 1, which is l-(2-methylphenyl)-4-{4-[N-(l- bipheny lene-2-carboxamido)]pentyl } piperazine dihydrochloride.

Inventors: CHEN XI, YUAN JUN, CHEN, XI, YUAN, JUN
Applicants: CHEN XI, NEUROGEN CORP, YUAN JUN, CHEN, XI, NEUROGEN CORPORATION, YUAN, JUN
Application year: 1997
Main classification: C07D295
IPC codes: A61K31, A61P25, A61P43, C07D213, C07D215, C07D217, C07D239, C07D295, C07D333