Piperazine-Substituted Benzothiophenes For Treatment of Mental Disorders

Abstract

The present invention provides a heterocyclic compound represented by the general formula (1): The compound of the present invention has a wide treatment spectrum for mental disorders including central nervous system disorders, no side effects and high safety.

1 - 16 . (canceled) 
     
     
         17 . A method for treating obesity comprising administering a heterocyclic compound represented by the formula (I) or a salt thereof to a human or animal: 
       
         
           
           
               
               
           
         
         wherein ring Q represented by 
       
       
         
           
           
               
               
           
         
         represents 
       
       
         
           
           
               
               
           
         
         wherein 
       
       
         
           
           
               
               
           
         
         represents —NH—CH 2 —, —CH 2 —NH— or —CH═N—; and
 the carbon-carbon bond   between the 3-position and 4-position of the heterocyclic skeleton containing Z and Y represents a single bond or a double bond; 
 
         the ring Q may have at least one substituent selected from the group consisting of a lower alkyl group, a lower alkenyl group, a lower alkynyl group, a hydroxy group, a lower alkoxy group, a halogenated lower alkyl group, an aryl group, an aryl lower alkyl group, an aryl lower alkoxy group, an arylcarbonyl group, a lower alkenyloxy group, a lower alkanoyl group, a lower alkanoyloxy group, a cycloalkyl group, a cycloalkyl lower alkyl group, a halogen atom, a carbamoyl group which may have a lower alkyl group, a carboxy group, a lower alkoxycarbonyl group, an amino group which may have a lower alkanoyl group, a nitro group, a hydroxy lower alkyl group, an amino lower alkyl group which may have a lower alkyl group, a thienyl group, a saturated 3- to 8-membered heteromonocyclic group containing 1 to 2 nitrogen atoms-substituted lower alkyl group and an oxo group; 
         R 2  represents a hydrogen atom or a lower alkyl group; and 
         A represents —O-A 1 - (wherein A 1  represents an alkylene group which may be substituted with a hydroxy group (wherein the one oxygen atom may replace a carbon of the alkylene chain) or a lower alkenylene group) or a lower alkylene group; 
         provided that when A represents a lower alkylene group, the ring Q represents a bicyclic group selected from the group consisting of: 
       
       
         
           
           
               
               
           
         
         wherein the carbon-carbon-bond   represents a single bond or a double bond. 
       
     
     
         18 . The method according to  claim 17 , wherein the heterocyclic compound of the formula (1) is selected from the group consisting of:
 (1) 7-[4-(4-benzo[b]thiophen-4-yl-piperazin-1-yl)butoxy]-1H-quinolin-2-one,   (2) 7-[3-(4-benzo[b]thiophen-4-yl-piperazin-1-yl)propoxy]-1H-quinolin-2-one,   (3) 7-[3-(4-benzo[b]thiophen-4-yl-piperazin-yl)propoxy]-3,4-dihydro-1H-quinolin-2-one,   (4) 7-[4-(4-benzo[b]thiophen-4-yl-piperazin-1-yl)butoxy]-3,4-dihydro-1H-quinolin-2-one,   (5) 7-[4-(4-benzo[b]thiophen-4-yl-piperazin-1-yl)butoxy]-1-methyl-3,4-dihydro-1H-quinolin-2-one and   (6) 6-[3-(4-benzo[b]thiophen-4-yl-piperazin-1-yl)propoxy]-3,4-dihydro-1H-quinolin-2-one;   or a salt thereof.   
     
     
         19 . The method according to  claim 17 , wherein the heterocyclic compound of the formula (1) is selected from the group of:
 (1) 7-[3-(4-benzo[b]thiophen-4-yl-piperazin-1-yl)propoxy]-3,4-dihydro-2H-isoquinolin-1-one   (2) 7-[3-(4-benzo[b]thiophen-4-yl-piperazin-1-yl)propoxy]-2-methyl-3,4-dihydro-2H-isoquinolin-1-one,   (3) 7-[4-(4-benzo[b]thiophen-4-yl-piperazin-1-yl)butoxy]-2-methyl-3,4-dihydro-2H-isoquinolin-1-one,   (4) 7-[4-(4-benzo[b]thiophen-4-yl-piperazin-1-yl)butoxy]-3,4-dihydro-2H-isoquinoline-1-one,   (5) 7-[3-(4-benzo[b]thiophen-4-yl-piperazin-1-yl)propoxy]-2H-isoquinolin-1-one and   (6) 7-[3-(4-benzo(b)thiophen-4-yl-piperazin-1-yl)propoxy]-2-methyl-2H-isoquinolin-1-one;   or a salt thereof.   
     
     
         20 . The method according to  claim 18 , wherein the heterocyclic compound of formula (1) is 7-[4-(4-benzo[b]thiophen-4-yl-piperazin-1-yl)butoxy]-1H-quinolin-2-one.