PROCESS FOR PREPARING QUINAZOLONE DERIVATIVES

摘要

Title compds. (I; A = -CH=CH-, -CH=N-, -S-; R1 = H, lower alkyl or alkoxy, amino, acetylamino, benzene, cyano, tetrazol-5-yl, substituted carboxy; R2 = cyano, tetrazol-5-yl, substituted carboxy) useful as antiallergic agent, were prepd. by reaction of II(X = halogen) and III, oxidation of IV and conversion Q and R of V(Q = R1, carboxy, methyl) to R1 and R2.