Fused heterocycles, VI: Reactions of 3-arylidenechromanones and -1-thiochromanones with thiourea
摘要:
Reactions of 3-arylidenechromanones (1-4) and -1-thiochromanones (5-8) with thiourea gave thiazines (9-16) under acidic and pyrimidine derivatives (17-21) under alkaline reaction conditions.