Bicyclic benzamides of 3- or 4-substituted 4-(aminomethyl)-piperidine derivatives

Abstract

The present invention of compounds of formula (I) a stereochemically isomeric form thereof, an N-oxide form thereof or a pharmaceutically acceptable acid addition salt thereof, R 1 and R 2 taken together form a bivalent radical of formula wherein in said bivalent radicals one or two hydrogen atoms may be substituted with C 1-6 alkyl; R 3 is hydrogen or halo; R 4 is hydrogen or C 1-6 alkyl; R 5 is hydrogen or C 1-6 alkyl; L is C 3-6 cycloalkyl, C 5-6 cycloalkanone, C 2-6 alkenyl, or L is a radical of formula -Alk-R 6 —, Alk-X—R 7 , -Alk-Y—C(═O)—R 9 , or -Alk-Y—C(═O)—NR 11 R 12 wherein each Alk is C 1-12 alkanediyl; and R 6 is hydrogen, cyano, C 1-6 alkylsulfonylamino, C 3-6 cycloalkyl, C 5-6 cycloalkanone, or a heterocyclic ringsystem; R 7 is hydrogen, C 1-6 alkyl, hydroxyC 1-6 alkyl, C 3-6 cycloalkyl, or a heterocyclic ringsystem; X is O, S, SO 2 or NR 8 ; said R 8 being hydrogen or C 1-6 alkyl; R 9 is hydrogen, C 1-6 alkyl, C 3-6 cycloalkyl, C 1-6 alkyloxy or hydroxy; Y is NR 10 or a direct bond; said R 10 being hydrogen, or C 1-6 alkyl; R 11 and R 12 each independently are hydrogen, C 1-6 alkyl, C 3-6 cycloalkyl, or R 11 and R 12 combined with the nitrogen atom may form an optionally substituted pyrrolidinyl, piperidinyl, piperazinyl or 4-morpholinyl ring. Processes for preparing said products, formulations comprising said products and their use as a medicine are disclosed, in particular for treating conditions which are related to impairment of gastric emptying.

1 . A compound of formula (I)  
     
       
         
         
             
             
         
       
     
     a stereochemically isomeric form thereof, an N-oxide form thereof or a pharmaceutically acceptable acid or base addition salt thereof, wherein 
 R 1  and R 2  taken together form a bivalent radical of formula  
   —O—CH 2 —O—  (a-1),  —O—CH 2 —CH 2 —  (a-2),  —O—CH 2 —CH 2 —O—  (a-3),  —O—CH 2 —CH 2 —CH 2 —  (a-4),  —O—CH 2 —CH 2 —CH 2 —O—(a-5),  —O—CH 2 —CH 2 —CH 2 —CH 2 —  (a-6),  
 wherein in said bivalent radicals one or two hydrogen atoms may be substituted with C 1 -6alkyl,  
 R 3  is hydrogen or halo;  
 R 4  is hydrogen or C 1-6 alkyl;  
 R 5  is hydrogen or C 1-6 alkyl;  
 L is C 3-6 cycloalkyl, C 5-6 cycloalkanone, or C 2-6 alkenyl, or L is a radical of formula  
   -Alk—R 6    (b-1),  -Alk-X—R 7    (b-2),  -Alk-Y—C(═O)—R 9    (b-3), or  -Alk-Y—C(═O)—NR 11 R 12    (b-4),  
 wherein each Alk is C 1-12 alkanediyl; and  
 R 6  is hydrogen, hydroxy, cyano, C 1-6 alkylsulfonylamino, C 3-6 cycloalkyl, C 5-6 cycloalkanone, or Het 1 ;  
 R 7  is hydrogen, C 1-6 alkyl, hydroxyC 1-6 alkyl, C 3-6 cycloalkyl, or Het 2 ;  
 X is O, S, SO 2  or NR 8 ; said R 8  being hydrogen or C 1-6 alkyl;  
 R 9  is hydrogen, C 1-6 alkyl, C 3-6 cycloalkyl, C 1-6 alkyloxy or hydroxy;  
 Y is NR 10  or a direct bond; said R 10  being hydrogen or C 1-6 alkyl;  
 R 11  and R 12  each independently are hydrogen, C 1-6 alkyl, C 3-6 cycloalkyl, or 
 R 11  and R 12  combined with the nitrogen atom bearing R 11  and R 12  may form a pyrrolidinyl or piperidinyl ring both being optionally substituted with C 1-6 alkyl, amino or mono or di(C 1-6 alkyl)amino, or said R 11  and R 12  combined with the nitrogen bearing R 11  and R 12  may form a piperazinyl or 4-morpholinyl radical both being optionally substituted with C 1-6 alkyl; and  
 Het 1  and Het 2  each independently are selected from furan; furan substituted with C 1-6 alkyl or halo; tetrahydrofuran; a tetrahydrofuran substituted with C 1-6 alkyl; a dioxolane; a dioxolane substituted with C 1-6 alkyl, a dioxane; a dioxane substituted with C 1-6 alkyl; tetrahydropyran; a tetrahydropyran substituted with C 1-6 alkyl; pyrrolidinyl; pyrrolidinyl substituted with one or two substituents each independently selected from halo, hydroxy, cyano, or C 1-6 alkyl; pyridinyl; pyridinyl substituted with one or two substituents each independently selected from halo, hydroxy, cyano, C 1-6 alkyl; pyrimidinyl; pyrimidinyl substituted with one or two substituents each independently selected from halo, hydroxy, cyano, C 1-6 alkyl, C 1-6 alkyloxy, amino and mono and di(C 1-6 alkyl)amino; pyridazinyl; pyridazinyl substituted with one or two substituents each independently selected from hydroxy, C 1-6 alkyloxy, C 1-6 alkyl or halo; pyrazinyl; pyrazinyl substituted with one ore two substituents each independently selected from halo, hydroxy, cyano, C 1-6 alkyl, C 1-6 alkyloxy, amino, mono- and di(C 1-6 alkyl)amino and C 1-6 alkyloxycarbonyl;  
 Het 1  can also be a radical of formula  
                     
 Het 1  and Het 2  each independently can also be selected from the radicals of formula  
                     
 R 13  and R 14  each independently are hydrogen or C 1-4 alkyl; and wherein the —OR 4  radical is situated at any position of the central piperidine moiety other than the 4 position.  
 
 
   
   
       2 . A compound as claimed in claims  1  wherein the —OR 4  radical is situated at the 3-position of the central piperidine moiety having the trans configuration.  
   
   
       3 . (canceled)  
   
   
       4 . A compound as claimed in  claim 1  wherein L is C 3-6 cycloalkyl or C 2-6 alkenyl; or L is a radical of formula (b-1), wherein each Alk is C 1-6 alkanediyl, and R 6  is hydrogen, hydroxy, cyano, amino, C 1-6 alkylsulfonylamino, C 3-6 cycloalkyl or Het 1 , wherein Het 1  is tetrahydrofuran; dioxolane; dioxolane substituted with C 1-6 alkyl; tetrahydropyran; pyridazinyl substituted with one or more substituents selected from hydroxy, halo and C 1-6 alkyl; or a radical of formula (c-1), (c-3) or (c-4) wherein R 13  is C 1 -4 alkyl; or L is a radical of formula (b-2), wherein Alk is C 1-6 alkanediyl, X is O, and R 7  is C 1-6 alkyl or hydroxyC 1-6 alkyl; or L is a radical of formula (b-2), wherein Alk is C 1-6 alkanediyl, R 7  is Het 2  wherein Het 2  is pyrazinyl substituted with C 1-6 alkyl, and X is NR 8  wherein R 8  is hydrogen or C 1-6 alkyl; or L is a radical of formula (b-3) wherein Y is a direct bond, and R 9  is C 1-6 alkyl, hydroxy or C 1-6 alkyloxy; or L is a radical of formula (b-4) wherein Y is a direct bond, and R 11  and R 12  are C 1-6 alkyl, or R 11  and R 12  combined with the nitrogen atom bearing R 11  and R 12  form pyrrolidinyl.  
   
   
       5 . A compound as claimed in  claim 1  wherein L is butyl; propyl substituted with methoxy, methylcarbonyl or 2-methyl-1,3-dioxolane; ethyl substituted with 4-methyl-2-pyridazinone or tetrahydropyranyl; or methyl substituted with tetrahydrofuranyl or tetrahydropyranyl.  
   
   
       6 . A compound as claimed in  claim 1  wherein the compound is 
 (trans)-(−)-4-amino-5-chloro-2,3-dihydro-N-[[3-hydroxy-1-(3-methoxypropyl)-4-piperidinyllmethyl]-2,2-dimethyl-7-benzofurancarboxamide; a pharmaceutically acceptable acid addition salt or an N-oxide form thereof.    
   
   
       7 . A pharmaceutical composition comprising a pharmaceutically acceptable carrier and a therapeutically active amount of a compound according to  claim 1 .  
   
   
       8 . (canceled)  
   
   
       9 . (canceled)  
   
   
       10 . A compound of formula (III)  
     
       
         
         
             
             
         
       
       a pharmaceutically acceptable acid addition salt thereof or a stereochemically isomeric form thereof, wherein R 1 , R 2 , R 3 , R 4  and R 5  are as defined in  claim 1  for compounds of formula (I) and wherein the —OR 4  radical is situated at any position of the central piperidine moiety other than the 4 position.  
     
   
   
       11 . A process for preparing a compound of formula (I) wherein 
 a) an intermediate of formula (II) is N-alkylated with an intermediate of formula (III) in a reaction-inert solvent and, optionally in the presence of a suitable base,                          b) an appropriate ketone or aldehyde intermediate of formula L′=O (IV), said L′=O being a compound of formula L-H, wherein two geminal hydrogen atoms in the C 1-12 alkanediyl moiety are replaced by ═O, is reacted with an intermediate of formula (III);                          c) an intermediate of formula (V) is reacted with an carboxylic acid derivative of formula (VI) or a reactive functional derivative thereof;                          d) an intermediate of formula (VII), wherein X is bromo or iodo, is carbonylated in the presence of an intermediate of formula (V) in a reaction-inert solvent in the presence of a suitable catalyst and a tertiary amine, and at a temperature ranging between room temperature and the reflux temperature of the reaction mixture;                          wherein in the above reaction schemes the radicals L, R 1 , R 2 , R 3 , R 4  and R 5  are as defined in  claim 1  and wherein the —OR 4  radical is situated at any position of the central piperidine moiety other than the 4 position, and W is an appropriate leaving group;    e) or, compounds of formula (I) are converted into each other following art-known transformation reactions; or if desired; a compound of formula (I) is converted into a pharmaceutically acceptable acid addition salt, or conversely, an acid addition salt of a compound of formula (I) is converted into a free base form with alkali; and, if desired, preparing stereochemically isomeric forms thereof.    
   
   
       12 . A process for preparing a compound of formula (III) wherein 
 a) an intermediate of formula (VIII), wherein PG is an appropriate protective group, is reacted with an acid of formula (VI), or an appropriate reactive functional derivative thereof, in a reaction-inert solvent and subsequent deprotection of the protecting group PG yielding compounds of formula (III);                          wherein in the above reaction schemes the radicals L, R 1 , R 2 , R 3 , R 4  and R 5  are as defined in  claim 1  and wherein the —OR 4  radical is situated at any position of the central piperidine moiety other than the 4 position, and W is an appropriate leaving group;    b) or, compounds of formula (III) are converted into each other following art-known transformation reactions; or if desired; a compound of formula (III) is converted into an acid addition salt, or conversely, an acid addition salt of a compound of formula (III) is converted into a free base form with alkali; and, if desired, preparing stereochemically isomeric forms thereof.    
   
   
       13 . A method of treating conditions involving a decreased gastrointestinal motility comprising administering to a subject in need thereof an effective amount of a compound according to  claim 1.