Fused polycyclic nitrogen-containing heterocycles 15.* 1,3-Bis(4-hydroxy-4-methoxycarbonyl-3,5-diphenylthiazolidin-2-ylideneamino)-benzene in the synthesis of thiazolo[3,4-a]quinoxalines

摘要

Reactions of methyl chloro(phenyl)pyruvate with 1,3-bis(phenylthioureido)benzene easily afforded 1,3-bis(4-hydroxy-4-methoxycarbonyl-3,5-diphenylthiazolidin-2-ylideneamino)ben-zene.Reactions of the latter with 1,2-phenylenediamines gave various derivatives of thiazo-lo[3,4-a]quinoxalines,including their bisanalogs.