Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D275/00—Heterocyclic compounds containing 1,2-thiazole or hydrogenated 1,2-thiazole rings
  • C07D275/04—Heterocyclic compounds containing 1,2-thiazole or hydrogenated 1,2-thiazole rings condensed with carbocyclic rings or ring systems
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P25/00—Drugs for disorders of the nervous system
  • A61P25/18—Antipsychotics, i.e. neuroleptics; Drugs for mania or schizophrenia
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D417/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00
  • C07D417/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing two hetero rings
  • C07D417/12—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing two hetero rings linked by a chain containing hetero atoms as chain links

Definitions

• the present invention relates to a group of piperazine and piperidine derivatives, to processes for their preparation, to pharmaceutical compositions containing them and to their use in therapy, in particular in the treatment of psychotic disorders.
• Receptors for the chemical messenger dopamine are known to be located in the striatum and the limbic brain area and such receptors have been classified as D] and D2 based on receptor binding studies and on the presence or absence of a positive coupling between the receptor and adenylate cyclase activity.
• Activation of the Dj -receptor is associated with stimulation of adenylate cyclase, whereas the D2-receptor mediates dopaminergic effects mat do not involve direct stimulation of this enzyme [see Kebabian & Calne. Nature. , 221 93(1979) and Harrold et al, J. ed. Chem.. 20, 1631(1987)].
• D2-receptor antagonism and antipsychotic activityfsee Seeman. Pharmacol. Rev.. 12, 229(1981), Seeman fit al, Riochem Pharmacol.. , 151(1985). Creese gt al, Science. 192. 481(1976) and Leysen in Clinical Pharmacology in Psvchiatrv: Neuroleptic and Antidepressant Research: Eds Usdin. Dahl, Gram and Lingjaerde. Macmillan: Basingstoke, pp35-52(1982)].
• 5-hydroxy trypta ine occurs widely in the central nervous system and is known to be involved in the control of behavior.
• a number of different 5-HT receptors and receptor sub-types have been identified.
• 5-HT2 receptor antagonism is also desirable in an antipsychotic agent
• blockade of central dopamine Do-receptors may control the positive symptoms of schizophrenia (e.g.
• blockade of 5-1 IT2 receptors may assist in the amelioration of the negative symptoms of schizophrenia (e.g. apathy and social withdrawal). It has also been suggested that blockade of the 5-HT2 receptor results in a reduction of the extrapyra idal side effects which are known to occur in the case of neuroleptic maintenance therapy with many known antipsychotic agents.
• Psychotropic benzisothiazoles and bcnzisoxazoles arc described in US4968792, EP0357134. EP0196132 and EP051 1610. Further anti-psychotic piperidines and piperazines are disclosed in EP0329168. EP0372657. EP0013612 and US5225412.
• a group of novel piperazine and piperidine derivatives has been discovered that are potent antagonists of dopamine D2 receptors and/or 5-ITTo receptors and are therefore useful in the treatment of psychotic disorders.
• the present invention provides a compound of formula (I), a salt, solvate or physiologically functional derivative thereof
• V comprises O or S
• Z comprises C j- alkylene optionally interrupted by -O- or -S(O) n - where n is 0. 1 or 2,
• X comprises N. CR 3 or COR 3 ;
• A comprises CR ⁇ or N
• B comprises oxygen.
• NR ⁇ or S(0) n where n is O. 1 or 2: and
• R comprises hydrogen or one or more halogen, hydroxy. nitro, CN, NR ⁇ A
• solvates in particular hydrates or partial hydrates, and such solvates. including physiologically acceptable solvates, are also included within the scope of the invention.
• alkyl as a group or a part of a group can be a straight or branched chain alkyl group optionally substituted by one or more halogens, hydroxy, nitro.
• CN, N(R 7 b. C j-galkoxy or COR 7 for example, methyl, ethyl, propyl, prop-2-yL butyl, but-2-yl or 2-methylprop-2-yl.
• Alkyl groups are most preferably methyl or ethyl.
• alkylene refers to a straight, branched or C5_gcyclic alkylene group optionally substituted by one or more halogens, hydroxy, nitro. CN. N(R ⁇ )2, C ⁇ alko y or COR°, for example, methylene, ethylene. butylene, pentylene. hexylene. cyclohexylene. or -(CH2) m C3_6cycloalkyl(C__2) m - where m is 0 to 4, in particular where C3_6cycloalkyl is a cyclopropylene group.
• alkenylene refers to a straight, branched or cyclic alkenyl group having from 4 to 8 carbon atoms optionally substituted by one or more halogens, hydroxy. nitro, CN. NfR ⁇ . C ⁇ alkoxy or COR ⁇ . such as. for example, ethenylene. propenylene. butcnylene. pentenylene. hexenylene and the like.
• alkvnvlene refers to a straight or branched alkvnyl group having from 4 to 8 carbon atoms, optionally substituted by one or more halogens. hydroxy. nitro. CN " . NfR ' ⁇ . C ⁇ ⁇ alkoxy or CUR O such as. for example, ethynylene, propynvlene. butynylene. pcntynylene. hoxynylene and the like.
• alkoxy refers 10 an -Oalkyl. -Oaikenyl or -Oalkynyl group A- used herein, the term “heteroaryl” refers to a monocyclic or bicyclic fused ring system comprising 5- 10 atoms wherein 1 or more ring atoms are independently selected from nitrogen, oxygen or sulfur.
• Bicyclic heteroaryl groups may have one of the rings with complete or partial saturation.
• aryl refers to phenyl. naphthalenyl optionally substituted by one or more halo, hydroxy, nitro, cyano. trifluoromethyl, lower alkyl, lower alkvlthio or NfRHy,.
• aryloxy and arylC ] .galkylenoxy refer to an -Oaryl and - OC ] .galkylenaryl group respectively wherein “aryl” and “alkyl” are as defined hereinbefore.
• halo refers to fluoro. chloro, bromo and iodo.
• physiologically functional derivative means any physiologically acceptable ester, or salt of such ester, of a compound of formula (I) or a compound which upon administration to the recipient is capable of providing (directly or indirectly) such a compound or an active metabolite or residue thereof.
• physiologically functional derivatives can also be prodrugs of the compounds of the present invention and are considered to be within the scope of the invention.
• the present invention includes all optical isomers of compounds of formula (I) and mixtures thereof including raccmic mixtures.
• the invention also includes all geometric isomers of compounds of formula (I) including mixtures thereof.
• the invention further provides compounds of formula (I) and salts, solvates and physiologically functional derivatives thereof in which the nitrogen atom shown in formula (I) which is adjacent to Z and which is part of the six-membered ring is in its oxidized form as N-oxide.
• the present invention includes compounds of formula ( I) in the form of physiologically acceptable salts thereof.
• Suitable salts arc, in particular, acid addition salts including those formed with both organic and inorganic acids. Such acids will normally be physiologically acceptable although salts of non-physiologically acceptable acids can be of utility in the preparation and purification of the compound in question.
• preferred salts include those formed from hydrochloric, hydrobromic. sulphuric, citric, tartaric, phosphoric, lactic, pyruvic. trifluoroacetic. acetic, succinic. oxalic, fumaric, aleic. oxaloacetic, methanesulphonic.
• Salts of compounds of formula ( I) can be made by reacting the appropriate compound in the form of the free base with the appropriate acid.
• the salt is the hydrochloride salt or dihydrochloride salt.
• the present invention also includes within its scope compounds of formula (I) which are in the form of a salt/solvate( in particular hydrate or partial hydrate).
• Base salts of the compounds of formula (I) are also included within the scope of the invention.
• Suitable base salts include those formed with both organic and inorganic bases. Such bases will normally be physiologically acceptable although salts of non- physiologically acceptable bases can be of utility in the preparation and purification of the compound in question.
• preferred base salts include those formed from alkali metal(e.g., sodium), alkaline earth metal(e.g., magnesium), ammonium and quaternary ammonium.
• Preferred heteroaryl groups are pyridinyl, pyrimidinyl. pyrazinyl, pyrazolyl. pyrrolyl, pyridazinyl. quinolinyl, isoquinolinyl. imidazolyl. bcnzimidazole, furyl, benzofuryl, thienyl. benzthienyl, indazolyl. oxazolyl. thiazolyl. isothiazolyl. isoxazolyl, purinyl, triazinyl.
• indolyl napthiridinyl, quinazolinyl, pyrrolopyridinyl, tetrahydroquinolinyl, indolinyl, quinoxalinyl, triazolyl or thiadiazolyl.
• heteroaryl groups are pyridinyl. pyrrolyl. quinolinyl. imidazolyl, furyl. thienyl. benzthienyl, indolyl, napthiridinyl, quinazolinyl. tetrahydroquinolinyl and indolinyl.
• heteroaryl groups are pyridinyl. quinolinyl. thienyl. benzthienyl. indolyl. tetrahydroquinolinyl and indolinyl
• Y is substituted with N R-A According to a further preferred aspect of the present invention Y is py ⁇ dine. thiophene or benzthiophene optionally substituted with N. R- b-
• R is H or Me
• Y is pyridine.
• thiophene or benzthiophene optionally substituted with.
• R is H and Y is pyridine or thiophene substituted with NH2-
• V is more preferably 0.
• Z is Cj-6 alkylene and is most preferably C4 alkylene;
• B is -S-, NH or -0-. is more preferably -S- or -O- and is most preferably -S-:
• A is CH or N and is most preferably N and R ! is H or F and is most preferably H.
• Preferred compounds of formula (I) include:
• N-(4-(4-( 1.2-Benzisothiazol-3-yl)- l-piperazinyl)butyl)-4-pyridinecarboxamide t-Butyl -N-(4-(N-(4-(4-( 1.2-benzisothiazol-3-yD- 1 -piperazinyl)butyl )carbamoyl)-3- thienyDcarbamate:
• More preferred compounds of formula (I) include:
• Salts of compounds of formula (I) are preferably the HC1 salts and solvates are preferably hydrates.
• the compounds of formula ( I) show an advantageous profile of pharmacological activity and are useful in the treatment of a number ol " conditions.
• the compounds show, for example anxiolytic, centrally-acting muscle relaxant, and antidepressant activity. They are also useful in the treatment of aggression associated with senile dementia, borderline personality disorders and as a broad-spectrum antiemetic. In particular the compounds are useful in the treatment of psychotic disorders such as schizophrenia.
• Potential antipsychotic activity can be assessed by the ability of a compound to block apomorphine-induced climbing in the mousefsee Ogren et ai, Eur. J. Pharmacol.. 12. 459(1984), Iversen. Science. 188. 1084(1975) and Gudelsky & Moore, J. Neural Transm.. 38. 95(1976)).
• the tendency of a compound to induce catalepsy and its ability to block apomorphine induced stereotypes are behavioural measures which indicate the potential of a compound to induce extrapyramidal side effects.
• the compounds of formula (I) are potent antagonists at dopamine D2 receptors and at 5-HTo receptors and have utility as antipsychotics. This profile of activity has been confirmed by the potency of compounds of formula (I) in the mouse-climbing assay and by good ratios of the dose required for potency in this assay to the dose required for the induction of catalepsy.
• Compounds of formula (I) are also potent agonists at the 5HTj ⁇ receptor. This activity has been associated with anti-depressant and an iolytic effects as well as with a reduction of extrapyramidal side-effects.
• the combination of potent dopamine D2 receptor antagonism and 5-HT2 receptor antagonism with 5-HT 1 receptor agonism which is to be found in compounds of formula (I) is a particularly advantageous profile of activity for an anti-psychotic agent and. in particular, for a drug for use in the treatment of schizophrenia.
• the present invention also provides a method for the treatment or prophylaxis in a mammal, such as a human, of a disorder selected from the following: anxiety, muscle spasm, depression, aggression associated with senile dementia, borderline personality disorders, emesis and psychosis which comprises administering to the mammal an effective treatment amount of a compound of formula (I) or a physiologically acceptable salt, or solvate or physiologically functional derivative thereof.
• a method for the treatment or prophylaxis in a mammal of a psvchotic disorder which comprises administering to the mammal an anti-psychotic effective treatment amount of a compound of formula (I ) or a physiologically acceptable salt or solvate thereof or a physiologically functional derivative or N-oxide thereof.
• the invention provides such a method wherein the psychotic disorder is schizophrenia.
• the presentinvexition provides axompouad of formula . ( 1) or a physiologically acceptable salt or solvate thereof, or a physiologically functional deriative or N-oxide thereof for use in therapy, in particular the therapy or prophylaxis of a psychotic disorder such as schizophrenia.
• the invention also provides the use of a compound of formula (I) or a physiologically acceptable salt or solvate thereof for the manufacture of a medicament for the treatment or prophylaxis of a psychotic disorder such as schizophrenia.
• the present invention provides a pharmaceutical composition comprising a compound of formula (I) or a physiologically acceptable salt or solvate thereof or a physiologically functional derivative or N-oxide thereof together with one or more pharmaceutically acceptable carriers therefor and optionally one or more other therapcutically active ingredients.
• the carrier(s) must be 'acceptable' in the sense of being compatible with the other ingredients of the composition and not deleterious to the recipient thereof.
• compositions include those suitable for oral, parenteral (including subcutaneous, transder al, intradermal. intramuscular and intravenous), rectal and topical (including dermal, buccal and sublingual) administration although the most suitable route can depend upon for example the condition and disorder of the recipient.
• the compositions can conveniently be presented in unit dosage form and can be prepared by any of the methods well known in the art of pharmacy. All methods include the step of bringing into association a compound of the present invention as herein defined or a pharmacologically acceptable salt or solvate thereof ("active ingredient” ) with the carrier which constitutes one or more accessory ingredients.
• compositions are prepared by uniformly and intimately bringing into association the active ingredient with liquid carriers or finely divided solid carriers or both and then, if necessary, shaping the product into the desired composition.
• Compositions of the present invention suitable for oral administration can be presented as discrete units such as capsules, cachets or tablets each containing a predetermined amount of the active ingredient: as a powder or granules; as a solution or a suspension in an aqueous liquid or a non-aqueous liquid: or as an oil-in-water liquid emulsion or a water-in-oil liquid emulsion.
• the active ingredient can also be presented as a bolus, electuary or paste.
• a tablet can be made by compression or moulding, optionally with one or more accessory ingredients.
• Compressed tablets can be prepared by compressing in a suitable machine the active ingredient in a free-flowing form such as a powder or granules, optionally mixed with a binder, lubricant, inert diluent, lubricating, surface active or dispersing agent.
• Moulded tablets can be made by moulding in a suitable machine a mixture of the powdered compound moistened with an inert liquid diluent.
• the tablets can optionally be coated or scored and can be formulated so as to provide slow or controlled release of the active ingredient therein.
• compositions for parenteral administration include aqueous and non-aqueous sterile injection solutions which can contain anti-oxidants, buffers, bacteriostats and solutes which render the composition isotonic with the blood of the intended recipient: and aqueous and non-aqueous sterile suspensions which can include suspending agents and thickening agents.
• the compositions can be presented in unit-dose or multi-dose containers, for example sealed ampoules and vials, and can be stored in a freeze-dried (lyophilised) condition requiring only the addition of the sterile liquid carrier, for example, water-for-injection. immediately prior to use.
• Extemporaneous injection solutions and suspensions can be prepared from sterile powders, granules and tablets of the kind previously described.
• compositions for transdermal administration can be delivered by passive diffusion or by electrically assisted transport, for example. iontophcresis
• Compositions for rectal administration can be presented as a suppository with the usual carriers such as cocoa butter or polyethylene glycol.
• compositions for topical administration in the mouth include lozenges comprising, the. active ingredient, in a ilav ⁇ ure basis such, as sucrose and acacia or tragacanth. and pastilles comprising the active ingredient in a basis such as gelatin and glycerin or sucrose and acacia.
• Preferred unit dosage compositions are those containing an effective dose, as hereinbelow recited, or an appropriate fraction thereof, of the active ingredient.
• compositions of this invention can include other agents conventional in the art having regard to the type of composition in question, for example those suitable for oral administration can include flavouring agents.
• the compounds of the invention are preferably used to treat psychotic disorders such as schizophrenia by oral administration or injection (intraparenteral or subcutaneous).
• the precise amount of compound administered to a patient will be the responsibility of the attendant physician. However the dose employed will depend on a number of factors, including the age and sex of the patient, the precise disorder being treated, and its severity. Also the route of administration can vary depending on the condition and its severity.
• the compounds of the invention are typically administered orally or via injection at a dose of from 0.02 to 50.0 mg/kg per day.
• the dose range for adult humans is generally from 1.4 to 3500 mg/day and preferably between 2.8 to 1750mg/day. more preferably 7 to 700mg/day.
• the present invention also provides processes for the preparation of compounds of formula ( I) and physiologically acceptable salts and solvates thereof and physioligically., functional derivatives thereof.
• the compounds of formula (I) can be prepared by any process known in the prior art for the preparation of analogous compounds.
• the groups Z. X. V. A. B, R. R 1 . R 2 . R a , R 2b , R 3 . R 4 . R 5 , RO, R " . R8, R9_ R 1 _ an( j R 1 1 have the meanings ascribed to them in formula (I) unless otherwise stated.
• compounds of formula (I) can be prepared by reaction of a compound of formula (II)
• L is a leaving group, for example, a halogen such as bromine, chlorine or iodine, an alkyl- or arylsulfonyloxy such as methanesulfonyloxy or p-toluenesulfonyloxy, in the presence of an appropriate solvent and base.
• a halogen such as bromine, chlorine or iodine
• an alkyl- or arylsulfonyloxy such as methanesulfonyloxy or p-toluenesulfonyloxy
• Suitable solvents include N.N-dimcthylformamide, acetonitrile. benzene, toluene, xylene etc. and appropriate bases can be chosen from organic bases such as triethvl amine. pyridine etc., alkali metal carbonates or bicarbonates such as sodium carbonate, potassiuim carbonate, sodium bicarbonate, potassium bicarbonate etc.. or alkali metal hydrides such as sodium hydride, potassium hvdride etc.
• W is a suitable anion, such as a halogen, for example, bromine or chlorine, sulphonic acid esters such as mesylate or tosylate and Rl- is -(CH2)4- or -(CH Js-, more particularly -(CH2.4-.
• a complexing agent such as 1.4.7, 10,13.16-hexaoxacyclooctatecane( 18-crown-6) can be included.
• the process can be carried out as described for general process (A) above.
• L is a haiogem .g.. Cl, B ⁇ . OMe or OH. or. :n e case where Y in the compound of formula ⁇ l) is to be subsur iec. at _. ieast one of me DOSI ⁇ O ⁇ .S ortho to the amide or thioamid ⁇ witn an - NHR- gr ⁇ _:.
• Suitable solvents include N.N-dimethylformamide. acetonitriie. dichloromethane. benzene, toluene, tetrahydrofuran. xylene etc. and appropriate bases can be chosen from organic bases such as triethvl amine. pyridine etc.. aikaii metal carbonates or bicarbo ⁇ ates such as sodium carbonate, potassiuim carbonate, sodium bicarbonate, potassium bicarbonate etc.. or alkali metal hydrides such as sodium hydride, potassium hydride etc. Additionally, catalysts or coupling reagents such as trimethylaluminum. isoburylchloroformate or 1 ,3-dicyclohexyicarbodiimide ⁇ ' DCC) can also be included.
• Compounds of formula (I) in which Z is C2-8 a lky'e ⁇ e can be prepared by reduction of a compound of formula (I) in which Z is C2-8alkenylene or C2-8alkynylene.
• Reduction can be achieved by catalytic hydrogenation with hydrogen in the presence of a suitable catalyst such as palladium, platinum, nickel, rhodium etc. in an appropriate solvent such as ethanol, tetrahydrofuran. methanol. ether, ethyl acetate, benzene, toluene, hexane etc.
• Compounds of formula (I) which are optionally substituted by one or more hydroxy can be prepared from the corresponding methoxy derivatives by known methods.
• a Lewis acid such as boron tribromide or aluminium trichloride in a solvent such as dichlormethane at room temperature
• C ' ompounds of formula (1 ) which are optionally substituted by one or more N(R b or NRN(R ⁇ b can be prepared by hydrolysis of the corresponding alkoxycarbonylamino derivatives by known methods. for example. by treatment of a ( tert-butoxycarbonyl )-amino derivative with an acid such as tritluroacetic acid, and a t-butyl cation scavenger. such. as anisole or thiophenol in a solvent such as chloroform at room temperature f Lundt. B.F. Int. Prept. Protein Res. J_2, 258( 1978)].
• Compounds of formula ( I) which are optionally substituted by one or more H2 can also be prepared by reduction of the corresponding nitro derivatives by known methods.
• a catalyst e.g., platinum, palladium, raney nickelfQrg. Synth.. 49, 1 16( 1969), J.Med.Chem.. 16, 1043( 1973); J.Org.Chem.. 38. 60( 1973)].
• an acid chloride such as acetyl chloride or ethyl chloroformate
• an organic base such as triethylamine in a solvent such as dichloromethane
• Compounds of formula (I) where R is C ] _6 alkyl can be prepared by alkylation of the corresponding secondary amide by known methodsf for example, by treatment with a base such as sodium hydride in a suitable solvent such as dimethylformamide. followed by treatment with an alkylating agent such as methyl iodide).
• Compounds of formula (I) where the nitrogen is oxidized to the N-oxide can be prepared by oxidation of compounds of formula ( I) with an oxidizing reagent such as m-chloroperoxybenzoic acid in an appropriate solvent such as dichloromethane.
• L is a leaving group such as for example a halogen such as bromine chlorine or iodine, an alkyl or an arylsulfonyloxy such as methanesulfonyloxy or p-toluenesulfonyloxy.
• a halogen such as bromine chlorine or iodine
• an alkyl or an arylsulfonyloxy such as methanesulfonyloxy or p-toluenesulfonyloxy.
• the compound of formula (XII) can in turn be prepared by condensation of a compound of formula ( IX) w ith an a i no alcohol of formula (XIII) H,N- ⁇ OH
• Suitable solvents include N.N-dimethylformamide, acetonitrile. benzene, toluene, xylene etc. and appropriate bases can be chosen from organic bases such as triethyl amine, pyridine etc.. alkali metal carbonates or bicarbonates such as sodium carbonate, potassium carbonate, sodium bicarbonate, potassium bicarbonate etc.. or alkali metal hydrides such as sodium hydride, potassium hydride etc.
• the requisite aminobenzo[b]thiophenes can be prepared by treatment of appropriately substituted 2-f uorobenzonitrile with the anion of methyl thioglvcolate followed by decarbomethoxylation of the resulting benzo[b]thiophene:
• compounds of formula (IXa) can be prepared by the treatment of the approp ⁇ ate 2-amino-substituted acids with phosgene or a phosgene substitute (e.g. trichloromethvl chlorotormate) in an appropriate solvent such as benzene or dioxane [J.Het.Chem. 1 , 565(1975); J.Amer.Che .Soc. 72, 48S7.( 1950): J.Org.Che . ⁇ , 2070( 1976)].
• phosgene or a phosgene substitute e.g. trichloromethvl chlorotormate
• the compounds of formula (IXa) where V represents oxygen can also be prepared by treatment of the appropriately substituted anhydrides of formula (XIX) with azidotri ethylsilane in an appropriate solvent such as chloroform.
• the corresponding thio derivatives of the formula (IXa) where V represents sulphur can be prepared by treatment of the corresponding oxo derivative with phosphorus pentasuifide in refluxing xvlenes.
• P is a protecting group, for example trifluoroacetate. by removal of the protecting group by known methods, for example aqueous potassium carbonate.
• Compounds of formula (Xc) wherein R C
• Compounds of formula (Xa) can be prepared by coupling compounds of formula(X) with cyanoacetic acid in the presense of a suitable coupling reagent such as 1.3- dicyclohexyicarbodiimide(DCC) in an appropriate solvent such as N.N'- dimethylform amide.
• a suitable coupling reagent such as 1.3- dicyclohexyicarbodiimide(DCC) in an appropriate solvent such as N.N'- dimethylform amide.
• Antagonism of apomorphine (5mg/kg s.c.) - induced climbing in the mouse is a measure of dopamine receptor antagonism in the mesolimbic brain region and in turn reflects potential antipsychotic activity.
• the active ingredient is mixed with the lactose and starch and granulated with a solution of the polyvinylpyrrolidone in water.
• the resultant granules are dried, mixed with magnesium stearate and compressed to give tablets.
• the salt of a compound according to the invention is dissolved in sterile water for injection.
• Active ingredient 0.20g Sterile, pyrogen-free phosphate buffer (pH9.0) to I Oml
• the active ingredient as a salt is dissolved in most of the phosphate buffer at
• Capsule Composition I can be prepared by admixing the ingredients and filling two-part hard gelatin capsules with the resulting mixture.
• Capsules can be prepared by melting the Macrogel 4000 BP, dispersing the active ingredient in the melt, and filling two-part hard gelatin capsules therewith.
• Capsule Composition III Controlled release capsule
• the controlled-release capsule composition can be prepared by extruding mixed ingredients (a) to (c) using an extruder, then spheronising and drying the extrudate.
• the dried pellets arc coated with ethyl cellulose (d) as a controlled-release membrane and tilled into two-part hard gelatin capsules.
• the sodium benzoate is dissolved in a portion of the purified water and the sorbitol solution added.
• the active ingredient is added and dissolved.
• the resulting solution is mixed with the glycerol and then made up to the required volume with the purified water.
• the active ingredient is used as a powder wherein at least 90% of the particles are of 63mm diameter or less.
• Witepsol H 15 is meleted in a steam-jacketed pan at 45 °C maximum.
• the active ingredient is sifted through a 200mm sieve and added to the molten base with mixing, using a Silverson fitted with a cutting head, until a smooth dispersion is achieved. Maintaining the mixture at 45 C. the remaining Witepsol HI 5 is added to the suspension which is stirred to ensure a homogenous mix.
• the entire suspension is then passed through a 250mm stainless steel screen and. with continuous stirring, allowed to cool to 40 C. At a temperature o 38-40 °C. 2.02g aliquots of the mixture arc filled into suitable plastic moulds and the suppositories allowed to cool to room temperature.
• compositions suitable for transdermal administration can be presented as discrete patches adapted to remain in intimate contact with the epidermis of the recipient for a prolonged period of time.
• patches suitably contain the active compound 1 ) in an optionally buffered, aqueous solution or 2) dissolved in an adhesive or 3) dispersed in a polymer.
• a suitable concentration of the active compound is about 1% to 20%. preferably about 3% to 15%.
• the active compound must be delivered from the patch by iontophoresis as generally described in Pharmaceutical Research. 3(6). 318(1986).
• Thin-layer chromatography was performed with Analtech silica gel FG TLC plates (250 mm). H NMR and J C NMR were determined with superconducting, FT NMR spectrometers operating at 200, 300, and 500 MHz. Chemical shifts are expressed in ppm downfield from internal trimethylsilane. Significant H NMR data are reported in order: multiplicity (s, singlet; d. doublet; t, triplet; q, quartet: m, multiplet), number of protons, and coupling constants in Hz. Elemental analyses were performed by either Atlantic Microlab. Inc.. Norcross Georgia, or Galbraith Laboratories. Inc.. noxville. Tennessee.
• N-(4-Bromobutyl)phthalimide (3.50 g, 0.0124 mol), 3-( 1-piperaziny 1.-1.2- benzisothiazole (2.72 g, 0.0124 mol, 1.0 eq), triethylamine (2.24 mL. 0.0161 mol. 1.3 eq ) and acetonitrile ( 15.0 mL) were added to a 100-mL, round-bottomed flask. The cloudy orange solution was heated under N2 at retlux for 17 h. The mixture was allowed to cool to room temperature and diluted with dichloromethane.
• Nicotinovl chloride hydrochloride (Aldrich Chemical Company) ( 1.1 g, 6.1 mmol) was added portion-wise to an ice-cold, stirred solution of 3-(4-(4-aminobutyl)-l - piperazinyl)-1.2-benzisothiazole ( 1 .8 g. 6.0 mmol) and triethylamine (2.5 mL. 17.9 mmol. 3.0 eq) in dichloromethane (25.0 mL). The resulting suspension was allowed to stir at 0 °C for 0.5 h and at room temperature for 2 h.
• the cloudy reaction mixture was diluted with dichloromethane (25.0 mL) and washed with saturated NaHCOs (2 X 50 mL). The organic layer was separated, dried over Na2SO4, filtered, and concentrated with a rotary evaporator to give an off-white foam.
• the crude material was dissolved in isopropanol (20.0 mL), chilled with an ice water bath and treated dropwise with HCl (6.0 ml of a I N solution in ether) with swirling. The mixture was diluted with ether (40.0 mL ) and the resulting off-white solid was filtered and washed with ether (3 X 10 mL).
• This compound was prepared, according to the method described in Example ( 1 (c)), by employing isonicotinoyl chloride hydrochloride (Aldrich Chemical Company) ( 1.1 g, 6.1 mmol). 3-(4-(4-aminobutyl)- l-piperazinyl)-1.2-benzisothiazole (Example 1 (b)) ( 1.8 g. 6.0 mmol) and triethylamine (2.5 mL, 17.9 mmol, 3.0 eq ) in dichloromethane (25.0 mL).
• isonicotinoyl chloride hydrochloride Aldrich Chemical Company
• 3-(4-(4-aminobutyl)- l-piperazinyl)-1.2-benzisothiazole (Example 1 (b)) ( 1.8 g. 6.0 mmol) and triethylamine (2.5 mL, 17.9 mmol, 3.0 eq ) in dichlorome
• Picolinic acid ( 1.2 g. 9.7 mmol ) (Aldrich Chemical Company) and potassium hydroxide (0.56 g. 10.0 mmol ) were dissolved in distilled water (25.0 mL). The water was removed with a rotary evaporator and the resulting white solid residue was treated with benzene (25.0 mL). The solution was concentrated and dried under high vacuum. The resulting potassium salt was suspended in benzene ( 15.0 mL) and cooled in an ice water bath. Oxalyl chloride ( 1 .0 mL. 1 1.5 mmol) was added dropwise to this cooled solution. The reaction mixture was allowed to warm to room temperature and gradually to warm to a gentle reflux.
• a 2 1 mixture of 3- and 6-azaisatoic anhydride was obtained from 2.3- pyridinedicarboxylic anhydride (Aldrich Chemical Company) ( 1 1.4 g, 76 mmol), azidotrimethylsilane (Aldrich Chemical Company) (1 1.4 mL. 86 mmol. 1.1 eq). and chloroform (50.0 mL) according to the method described by D. J. Le Court and D. J. Dewsbury, Synthesis. 1 1. 972(1982).
• hydrochloride salts of each isomer were prepared independently by dissolving the free amine in dichloromethane (20.0 mL), filtering, and treating the filtrate with HCl (1 equiv. of a IN solution in ether). The solutions were diluted with ethyl acetate and allowed to stir at room temperature for 1 h. The resulting white crystals were collected by filtration and dried in a vacuum oven to give the corresponding hydrochloride salts.
• Example 4 2-Amino- ⁇ '-(4-(4-(1.2-benzisothiazol-3-yl)-l-piperazinyl)butyl)-3- pyridinecarboxamidc hydrochloride.
• Example 7 4-Amino- ⁇ ' -(4-(4-(1.2-benzisothiazol-3-yl)-l-piperazinyl)butyl)-3- pyridinecarboxamide dihydrochloride. mp: 122-130 °C (effervesces).
• Methyl-4-aminothiophene-3-carboxylate hydrochloride (6.57 g, 33.9 mmol) (Maybridge Chemical Company), 1 ,4-dioxane (25 mL) and 5% Na2C03 (25 mL) were combined in a 500 mL. round-bottomed flask, and the mixture was cooled in an ice-water bath. A solution of di-tert-butvl dicarbonate ( 18.6 g. 85.2 mmol. 2.51 eq) (Aldrich Chemical Company) in 1.4-dioxane (25 mL) was slowly added to the reaction mixture. The ice-water bath was removed and the reaction mixture was allowed to warm to room temperature for 18 h.
• the organic layer was separated and the aqueous layer was extracted with dichloromethane. The organic layers were combined, washed with saturated NaCl, dried over MgS ⁇ 4, filtered and concentrated to give an orange oil.
• the free base was partially purified by flash chromatography with dichloromethane followed by dichloromethane : methanol (96 : 4) as eluant to give a cloudy orange oil. The oil was dissolved in dichloromethane. filtered and concentrated to give a less cloudy orange oil. The crude free base was dissolved in ethyl acetate, filtered and concentrated to give 2.73 g (86%) of the free base as a clear orange oil.
• Example 1 (b) Example 1 (b) and anhydrous chloroform (20 mL) were added to a 100-mL. round- bottomed flask and stirred under N : 2- A solution of trimethylaluminum (4.6 mL. 9.2 mmol. 1.03 eq) (Aldrich Chemical Company. 2.0 M in toluene) was slowly added to the reaction mixture and the pale yellow solution was stirred under N2 for 20 min. Another portion of trimethylaluminum (4.6 mL, 9.2 mmol, 1.03 eq) was added to the reaction mixture. A solution of methyl 3-aminobenzo[b]thiophene-2-carboxylate ( 1.86 g. 8.98 mmol.
• the free base was purified by flash chromatography with a gradient eluant of dichloromethane ( 100-95%): methanol (0-5%) to give 1.14 g (27%) of the free base as an orange oil.
• the free base 1.05 g (2.25 mmol) was dissolved in ethyl acetate and 2.25 mL of 1 N ethereal HCl ( 1.0 eq) was added.
• the hydrochloride salt was recrystallized from ethanol / water to give 0.82 g ( 18%) of the title compound as a beige solid, mp: 242-244 ⁇ A.
• I-I NMR (DMSO-d6) ⁇ 1.58 (m. 2). 1.76 (m. 2).
• Example Kb cyanoacetic acid (0.76 g, 8.93 mmol, 1.16 eq) (Aldrich Chemical Company) and N,N-dimethylformamide (20 mL) were added to a 250-mL. round- bottomed flask, and stirred under N2- A solution of 1.3-dicyclohexylcarbodiimide ( 1.86 g, 9.01 mmol, 1.17 eq) (Aldrich Chemical Company) in N. N-dimethylformamide (5 mL) was added dropwise to the reaction mixture. 1 -Hydroxybenzotriazole hydrate ( 1.24 g. 9.18 mmol.
• reaction mixture was cooled in an ice-water bath and stirred under N - A solution of 1.3-dicyclohexylcarbodiimide (1.37 g. 6.64 mmol. 1 .10 eq) (Aldrich Chemical Company) in anhydrous N. N-dimethylformamide ( 12 mL) was added dropwise to the reaction mixture. The ice- water bath was removed and the reaction mixture was stirred at room temperature. for. 20 h. The suspension was concentrated in vacua and the crude product was partitioned between ethyl acetate and saturated NaHC03. The layers were separated and the aqueous layer was extracted with ethyl acetate. The organic layers were combined. dried over M2SO4.
• This compound was prepared according to the method described for Example 13(a) by employing 1.2.3.4-tetrahydro-8-quinolinecarboxylic acid ( 1.06 g. 5.98 mmol), 1 -hydroxybenzotriazole hydrate (0.90 g, 6.66 mmol, 1.1 eq) (Aldrich Chemical Company). 1.3-dicyclohexylcarbodiimide ( 1.47 g, 7.12 mmol, l -2 eq) (Aldrich Chemical Company). 3-(4-(4-aminobutyl)-l-piperazinyl)-l ,2-benzisothiazole (1.82 g, 6.27 mmol.
• the aqueous layer was separated, the pH was adjusted to 6-7 by the addition of IN HCl and the solution was extracted with chloroform. The pH of the aqueous layer was adjusted to 4-5 by the addition of IN HCl and extracted with an additional portion of chloroform. The organic layers were dried over MgSO4. filtered and concentrated to give a gold-tan solid.
• the crude product was triturated with benzene:isooctane (3:1) to give 0.54 g (57%) of the title compound as a tan solid, mp: 164-166 °C. [lit. (Welstead, W.J., et al.. J. Med. Chem. 1979, 22, 1074) mp: 164-168 °C].
• Example 13(a) This compound was prepared according to the method described for Example 13(a) by employing indoline-7-carboxylic acid (0.86 g, 5.27 mmol), 3-(4-(4-aminobutyl)-l- piperazinyl)- 1.2-benzisothiazole ( 1.60 g, 5.51 mmol, 1 .05 eq) (Example 1(b)), 1 -hydroxybenzotriazole hydrate (0.78 g. 5.77 mmol, 1.10 eq) (Aldrich Chemical Company). 1.3-dicyclohexylcarbodiimide ( 1.35 g. 6.54 mmol.
• This compound was prepared according to the method described for Example 13(a) by employing l f/-indole-7-carboxylic acid (1.32 g, 8.19 mmol), 3-(4-(4-aminobutyl)- l - piperazinyl)- 1.2-benzisothiazole (2.47 g, 8.51 mmol. 1.04 eq) (Example Kb)), 1-hydroxybenzotriazole hydrate ( 1.20 . 8.88 mmol. 1.08 eq) (Aldrich Chemical Company). 1.3-dicyclohexylcarbodiimide ( 1.87 g. 9.06 mmol.

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