Isoindole compounds of the formula (I) ##STR1## wherein R.sub.1 represents hydrogen; C.sub.1 -C.sub.6 alkyl; benzyl optionally substituted with halogen, hydroxy, C.sub.1 -C.sub.6 alkoxy, methylenedioxy; C.sub.2 -C.sub.8 aliphatic acyl; benzoyl optionally substituted with halogen, hydroxy, C.sub.1 -C.sub.6 alkoxy, C.sub.2 -C.sub.6 alkanoyl, C.sub.2 -C.sub.6 alkanoyloxy, C.sub.1 -C.sub.4 alkyl, trifluoromethyl, methylenedioxy;R.sub.2 -R.sub.3 are selected independently from hydrogen; halogen; C.sub.1 -C.sub.4 alkyl; trifluoromethyl; hydroxy; nitro; amino; mono or di C.sub.1 -C.sub.4 alkylamino; cyano; C.sub.1 -C.sub.6 alkoxy; C.sub.2 -C.sub.6 alkoxycarbonyl;Y is ethylene, or a straight or branched alkylene chain containing from 3 to 6 carbon atoms, and the salts thereof of pharmaceutically acceptable acids. The compounds possess antianginal activity and are used in the preparation of medicaments for antianginal therapy.