Novel substituted diamine derivatives useful as motilin agonists

Abstract

The present invention relates to novel substituted diamine derivatives for the formula wherein R 1 , R 2 , R 3 , R 4 , X 1 , X 2 , X 3 , X 4 , A, Y and n are as described in the specification, pharmaceutical compositions containing them and intermediates used in their manufacture. More particularly, the compounds of the invention are motilin receptor antagonists useful for the treatment of associated conditions and disorders such as gastrointestinal reflux disorders, eating disorders leading to obesity and irritable bowel syndrome.

1 . A compound of formula (I):  
     
       
         
         
             
             
         
       
       wherein:  
       R 1  is selected from the group consisting of hydrogen, aryl, aralkyl, heterocyclyl, diarylalkyl, heterocyclyl-alkyl, and lower alkyl; wherein the alkyl, aryl or heterocyclyl moieties in the foregoing groups may be substituted with one or more substituents independently selected from halogen, hydroxy, nitro, carboxy, cyano, amino, dialkylamino, lower alkoxy, lower alkyl, tri-halomethyl, alkylamino, carboxy and alkoxycarbonyl;  
       R 2  is selected from the group consisting of aryl, aralkyl, cycloalkyl, cycloalkyl-alkyl heterocyclyl, heterocyclyl-alkyl, diarylalkyl, aminoalkyl, tri-halomethyl, arylamino and lower alkyl; wherein the alkyl, aryl, heterocyclyl-alkyl, heterocyclyl, or amino moieties in the foregoing groups may be substituted with one or more substituents independently selected from halogen, hydroxy, nitro, cyano, amino, dialkylamino, lower alkoxy, lower alkyl, tri-halomethyl, alkylamino, phenyl, carboxy, carboxyalkyl and alkoxycarbonyl;  
       X 1 , X 2 , X 3  and X 4  are independently absent or selected from the group consisting of CO and SO 2 ; provided that at least one of X 1  or X 2  and at least one of X 3  or X 4  is CO or SO 2 ;  
       alternatively R 1 , R 2  and X 1  can be taken together (with the amine nitrogen) to form a monocyclic or fused bicyclic or tricyclic secondary amine ring structure; wherein the monocyclic or fused bicyclic or tricyclic secondary amine ring structure may be optionally substituted with one or more substituents independently selected from halogen, oxo, nitro, cyano, amino, alkylamino, dialkylamino, trialkylamino, lower alkoxy, lower alkyl, tri-halomethyl, carboxy, acetyloxy, alkoxycarbonyl, aryl, aralkyl and heterocyclyl;  
       A is selected from the group consisting of lower alkyl, lower alkenyl, cycloalkyl, cycloalkyl-alkyl, alkyl-cycloalkyl, cycloalkenyl, cycloalkenyl-alkyl, alkyl-cycloalkenyl, alkyl-cycloalkyl-alkyl; alkyl-aryl-alkyl, alkyl-aryl, aryl-alkyl and phenyl; where, in each case, the A group may optionally be substituted with one or more substituents selected from R 7 ;  
       where R 7  is selected from alkyl, tri-halomethyl, cycloalkyl, aryl, aralkyl, heterocyclyl, heterocyclyl-alkyl, diarylalkyl, aminoalkyl, or arylamino; wherein the alkyl, aryl, heterocyclyl-alkyl, heterocyclyl, or amino moieties in the foregoing groups may be substituted with one or more substituents independently selected from halogen, hydroxy, nitro, cyano, amino, dialkylamino, lower alkoxy, lower alkyl, tri-halomethyl, alkylamino, phenyl, carboxy and alkoxycarbonyl;  
       provided that A is not -1,3-cyclopentyl-1-ene-alkyl;  
       R 3  is selected from the group consisting of hydrogen, aryl, heterocyclyl, aralkyl, diarylalkyl, heterocyclo-alkyl, tri-halomethyl, alkylamino, arylamino and lower alkyl; wherein the aryl, heterocyclyl, aralkyl, diarylalkyl, heterocyclyl-alkyl, alkylamino, arylamino or lower alkyl group may be substituted with one or more substituents independently selected from halogen, nitro, cyano, amino, dialkylamino, lower alkoxy, lower alkyl, tri-halomethyl, carboxy and alkoxycarbonyl;  
       Y is selected from the group consisting of —O—, —NH—, —S— and —SO 2 —;  
       n is an integer from 0 to 5;  
       R 4  is selected from the group consisting of hydrogen, amino, alkylamino, dialkylamino, N-alkyl-N-aralkyl-amino, trialkylamino, dialkylaminoalkoxyalkyl, heterocyclyl, heterocyclyl-alkyl, oxo-substituted heterocyclyl and lower alkyl substituted heterocyclyl;  
       R 5  is selected from the group consisting of hydrogen, halogen, nitro, cyano, amino, alkylamino, dialkylamino, trialkylamino, lower alkoxy, lower alkyl, tri-halomethyl, carboxy and alkoxycarbonyl;  
       and the pharmaceutically acceptable salts, esters and pro-drug forms thereof.  
     
   
   
       2 . A compound as in  claim 1  wherein R 1  is benzyl, R 2  is benzyl, A is 1,3-cyclohexyl-methyl, X 1  is absent, X 2  is absent, X 3  is absent, X 4  is C(O), R 3  is 4-fluorophenyl, Y is 3-O—, n is 2, R 4  is 1-pyrrolidinyl and R 5  is hydrogen and pharmaceutically acceptable salts, esters and pro-drug forms thereof.  
   
   
       3 . A pharmaceutical composition comprising a pharmaceutically acceptable carrier and a compound of  claim 1 .  
   
   
       4 . A pharmaceutical composition made by mixing a compound of  claim 1  and a pharmaceutically acceptable carrier.  
   
   
       5 . A process for making a pharmaceutical composition comprising mixing a compound of  claim 1  and a pharmaceutically acceptable carrier.