Heterocyclic lactam compounds

Abstract

A compound of the formula ##STR1## and pharmaceutically acceptable salts thereof, in which A is --N.dbd.N--NH--, --X--C(R.sub.2).dbd.N--, --N.dbd.C(R.sub.2)--X--, --X--C(R.sub.2)--CH(R.sub.2).dbd.N-- or --N.dbd.C(R.sub.2)--CH(R.sub.2)--X--, wherein X is sulphur, oxygen or nitrogen and R.sub.2 is provided that where two R.sub.2 -groups are present in the A group one of the R.sub.2 groups is hydrogen, amino, substituted amino, C.sub.1-6 alkyl, substituted acylamino or one of the following groups: ##STR2## wherein R.sub.a is hydrogen, amino, substituted amino, C.sub.1-6 alkoxy, heterocyclic five membered ring or --NHCOR', wherein R' is C.sub.1-6 alkyl, aryl or heterocyclic five membered ring, R.sub.b is hydrogen, C.sub.1-6 alkoxy, C.sub.1-6 alkylthio or hydroxy, R.sub.c is hydrogen, C.sub.1-6 alkyl or oxygen and R.sub.d is C.sub.1-6 alkyl or oxygen, R.sub.e is hydrogen, hydroxy or C.sub.1-6 alkoxy, R.sub.f is C.sub.1-6 alkyl, provided that where two R.sub.2 -groups are present in the A group, one of the R.sub.2 groups is hydrogen; B is --(CH.sub.2).sub.m --C(R.sub.3 R.sub.4)--(CH.sub.2).sub.n --, --C(R.sub.3).dbd.CH--, --CH.dbd.C(R.sub.3)--, --O--[C(R.sub.3 R.sub.4)].sub.n --, --[C(R.sub.3 R.sub.4)].sub.n --O--, --S--[C(R.sub.3 R.sub.4)].sub.n -- or --[C(R.sub.3 R.sub.4)].sub.n --S-- wherein R.sub.3 and R.sub.4, which can be independently the same or different, are hydrogen, C1-.sub.6 alkyl, aryl (preferably phenyl) or pyridyl and m and n are independently zero or 1; D is either oxygen or sulphur; the two R-groups are indepenently hydrogen, C.sub.1-6 alkoxy, C.sub.1-6 alkyl, amino, acylamino or substituted acylamino, nitro, halogen, cyano, aldehyde, carboxy, carbamoyl; R.sub.1 is a hydrogen or C.sub.1-6 alkyl or R and R.sub.1 form together a fused 6-membered heterocyclic ring. The compound is effective in the treatment of congestive heart failure.