The reactions of diketene with S, S-dimethyl-N-2-pyridinylsulfilimine (IVa) and N-2-benzothiazolyl-S, S-dimethylsulfilimine (IVb) gave 2-(2-dimethylsulfuranylideneaceto-acetamido) pyridine (VIa) and 2-(2-dimethylsulfuranylideneacetoacetamido) benzothiazole (VIb), respectively. However, the reaction of diketene with S, S-dimethyl-N-(4-nitrophenyl) sulfilimine (IVc) and N-2-benzoxazolyl-S, S-dimethylsulfilimine (IVd) gave 3-acetyl-4-hydroxy-6-methyl-1-(4-nitrophenyl)-2-pyridone (VIIc) and 3-acetyl-1-(2-benzoxazolyl)-4-hydroxy-6-methyl-2-pyridone (VIId), respectively. On the other hand, the reaction of diphenylketene with sulfilimines (IVa, IVb, and IVd) gave the corresponding 1, 3-cyclization products (VIII, IX, and X).
双烯酮与S,S-二甲基-N-2-
吡啶基
硫亚胺(IVa)和N-2-
苯并噻唑基-S,S-
二甲基硫亚胺(IVb)反应得到2-(2-二甲基亚磺基乙酰乙酰
氨基)
吡啶(VIa)和2分别为-(2-二甲基亚磺基乙酰乙酰
氨基)
苯并噻唑(VIb)。然而,
双乙烯酮与S,S-二甲基-N-(4-
硝基苯基)
硫亚胺(IVc)和N-2-
苯并恶唑基-S,S-
二甲基硫亚胺(IVd)反应得到3-乙酰基-
4-羟基-6-分别为甲基-1-(4-
硝基苯基)-2-
吡啶酮(VIIc)和3-乙酰基-1-(2-
苯并恶唑基)-
4-羟基-6-甲基-2-
吡啶酮(VIId)。另一方面,二苯基
乙烯酮与
硫亚胺(IVa、IVb和IVd)的反应得到相应的1, 3-环化产物(VIII、IX和X)。