N-ACYL SYDNONIMINE DERIVATIVES

1,186,878. N-Acylsydnonimines. TAKEDA YAKUHIN KOGYO K.K. 4 July, 1967 [4 July, 1966], No. 30742/67. Heading C2C. N-Acylsydnonimines of the Formula I and their pharmaceutically acceptable salts thereof, where R3 is H or 1-5 C-alkyl; R4 is -NO, an R5CO group derived from a carboxylic acid, a carbamic acid or a carbonic acid, R5 is H or a 1-9 C-radical (including optionally substituted hydrocarbon and heterocyclic radicals), an R6CO group derived from a naturally occurring amino acid or its N-acyl derivatives or an R7SO 2 group derived from a sulphonic acid where R7 is a (1-7 C)-radical (including optionally substituted alkyl and aryl groups, or R1 and R2 taken together with the adjacent N-atom represents morpholino piperolino, a 4-6 C- cyclic imino radical where n is 4, 5 or 6, an N-R-piperazino radical where R is 1-5 C alkyl or the radical are prepared by acylating a compound of the formula