Tetrahedron Letters,Vo1.24,No.30,pp 3155-3158,1983 0040-4039/83 $3.00 + .OO Printed in Great Britain ... A IJCVEL SYidTHESIS OF 5-ACYLAMINOBENZIX.DAZOLE-2-CARBAMATES : INTRAMOLECULAR REGIOSELECTIVE ADDITION TO WINONE-IMIDES.1 ... S. Rajappa*, R. Sreenivasan and AV Rane CIBA-GEIGY Research Centre, Goregaon, Bombay 400 063, India. ... Abstract : Oxidation of N',i\I" -biscarbomethoxy-&(4-acylamino) phenylguanidines ...