Cyclization reactions of 2-(2-chloro-4-nitrophenylsulfonyl)-1-(2-thienyl)ethanone
作者:Ai-Long Fan、Song Cao、Jing-Hua Xu、Zheng Zhang
DOI:10.1002/jhet.5570350237
日期:1998.3
A new sulfonyl group-containing heterocyclic compound 2-(2-chloro-4-nitrophenylsulfonyl)-1-(2-thienyl)ethanone 2 was prepared from the corresponding sulfide 2-(2-chloro-4-nitrophenylthio)-1-(2-thienyl)ethanone 1. Two different cyclization reactions of the compound 2 were discussed. In contrast to the tandem alkylation-cyclization process [1], another cyclic procedure was described. In the presence
由相应的硫化物2-(2-氯-4-硝基苯硫基)-1-(制备了一种新的含磺酰基杂环化合物2-(2-氯-4-硝基苯基磺酰基)-1-(2-噻吩基)乙酮2。 2-噻吩基)乙酮1。讨论了化合物2的两种不同的环化反应。与串联烷基化-环化过程[1]相反,描述了另一种循环过程。在以1,8-二氮杂双环[5.4.0]十一碳-7-烯为碱和二甲基甲酰胺为溶剂的情况下,将化合物2用丙烯酸乙酯或甲基丙烯酸甲酯在50-55°下处理,得到1,4-苯氧沙沙星4,4-二氧化物5或6分别通过 串联迈克尔共轭加成环化过程。