Synthesis of partially saturated N-substituted 4H-3,1-benzothiazine-2(1H)-thiones
摘要:
Acid-catalyzed reaction of 2-arylidenecyclohexanones 1 with N-substituted dithiocarbamic acids 2 gave open-chain addition products 3 and 4. Dehydration of 3 and 4 afforded only one of the three possible isomeric N-substituted 4H-3,1-benzothiazine-2(1H)-thiones 5 and 6.