Dipeptide derivatives and their production

Abstract From the Canadian patent

Dipeptides represented by the formula: wherein R represents hydrogen, C1-C6 alkyl group C2-C7, cyanoalkyl group, or C3-C10 dialkylaminoalkyl group; R1 represents hydrogen, methyl, isopropyl isobutyl, benzyl or, phenyl; R2 represents C1-C6 alkyl group C7-C14 aralkyl group, glycyl group or glycylglycyl group; R3 represents hydrogen or C1-C6 alkyl group, group R2-N-R3 optionally represents phthalimide piperidino group 4-hydroxy-4-(p-halogenophenyl)-piperidino morpholino or piperazino group substituted by alkyl or phenyl group; A ring represents benzene ring or pyridine ring optionally substituted by halogen and B ring represents halo-benzene ring and its acid accition salt, compounds are …