PROCESS FOR PREPARING HETEROCYDIC DERIVATIVES

摘要

A process for manufg. heterocyclic derivs. (I) used for effective antihistamines and antacids are described. Guanidine derivs (I; X = S or NH; Y = O or S; m = 0-4; n = 1-4; R1 = H, halo, C1-6 alkyl; R2 = H, C1-10 alkyl, C1-6 alkaloyl; A = 3,4-dioxocyclobutene-1,2 diol; B = C1-6 alkoxy) are prepd. by reacting compd. III and compd. IV.