Addition of phthalimidesulfenyl chloride (1) to diaryl- or alkyl(aryl) acetylenes affords (E)-ß-chlorovinylsulfenamides 3. These species react with aluminum trichloride and other Lewis acids to give benzo-[b]thiophenes 6 through an intramolecular electrophilic substitution. The reaction is very simple and seems insensitive to the nature of substituents at the double bond of vinylsulfenamides 3. Following the same strategy the thienothiophene 11 and the condensed thiopyran 12 were also prepared.
将邻苯二甲
酰亚胺基亚
磺酰氯(1)加到二芳基或烷基(芳基)
乙炔上会产生 (E)-ß-chlorovinylsulfenamides 3。这些物质与
三氯化铝和其他
路易斯酸反应,通过分子内亲电取代生成苯并[b]
噻吩 6。该反应非常简单,而且似乎对
乙烯基亚磺酰胺 3 双键上取代基的性质不敏感。按照同样的策略,还制备出了
噻吩 11 和缩合
噻喃 12。