Patent ID: 8227492

Claim:
A compound of formula (I) wherein ‘A’ represents an optionally substituted heterocyclic group; ‘B’ represents either a bond or B represents a radical of following formula R 2 represents (C 1 -C 10 )alkyl, (C 3 -C 10 )cycloalkyl groups, wherein the (C 1 -C 10 )alkyl chain further optionally contains from 1-3 heteroatoms selected from NR a R b , O, S or the groups carbonyl or iminocarbonyl; wherein either of R a R b if present, is independently selected from H, (C 1 -C 3 )alkyl groups; provided that the chain forms other than S—S, S—O, or O—O bond; R 1 represents hydrogen, cyano or the groups selected from optionally substituted (C 1 -C 10 )alkyl groups wherein the alkyl group may optionally contain from 1-3 heteroatoms selected from NR a R b , O, S or the groups carbonyl or iminocarbonyl; wherein either of RaRb if present, is independently selected from H, (C 1 -C 3 )alkyl groups; provided that the chain forms other than S—S, S—O, or O—O bond; or R 1 represents optionally substituted groups selected from (C 3 -C 10 )cycloalkyl, halo(C 1 -C 6 )alkyl, (C 1 -C 6 )heteroaryl, (C 1 -C 6 )aryl, aralkyl, heterocycle, heteroarylalkyl, heterocyclylalkyl, acyl, aminoalkyl, hydroxyalkyl, alkoxyalkyl, aryloxyalkyl, aralkoxyalkyl, aminocarbonyl, alkoxycarbonyl, cycloalkylcarbonyl, heterocyclylcarbonyl, arylcarbonyl, aminosulfonyl and alkylsulfonyl derivatives; or R 1 represents the following groups, where, R 6 and R 7 are independently selected from hydrogen, (C 1 -C 6 )alkyl; alternatively, R 6 and R 7 may cyclise to form a 5-7 membered heterocyclic ring; R 3 , R 4 and R 5 may be same or different and at each occurrence independently represents hydrogen, hydroxyl, halo, thio, amino, nitro, or substituted or unsubstituted groups selected from (C 1 -C 6 )alkyl, (C 1 -C 6 )cycloalkyl, halo(C 1 -C 6 )alkyl, (C 1 -C 6 )alkoxy, heterocycleoxy, halo(C 1 -C 6 )alkoxy, alkylamino, aminoalkyl, mono, di or trisubstituted amino, hydroxyalkyl, alkoxyalkyl, alkylsulfonyl, alkylsulfonylamino, aminocarbonyl, and aminosulfonyl derivatives; n represents integers from 1-4.