(3,3)Sigmatropic Ring Expansion of Cyclic Thionocarbonates. VII. On the Formation of 8-Membered Thionocarbonates as the Intermediates.
作者:Shinya HARUSAWA、Sachiko TOMII、Chiaki TAKEHISA、Hirofumi OHISHI、Ryouji YONEDA、Takushi KUEIHARA
DOI:10.1248/cpb.40.2279
日期:——
In order to clarify the reaction mechanism of [3, 3]sigmatropic ring expansion of cyclic thionocarbonates, the 8-membered thionocarbonates (6 and 7) were synthesized by treatment of the corresponding diol monothionocarbonates (5 and 13) with lithium bis(trimethylsilyl)amide. However, reaction of 7 with meta-chloroperbenzoic acid afforded an 8-membered carbonate (14) in a quantitative yield.
为了阐明环状硫碳酸酯的[3, 3]σ迁移环扩张反应机理,通过相应二醇单硫碳酸酯(5和13)与二(三甲基硅基)胺锂处理合成了8元环硫碳酸酯(6和7)。然而,7与间氯过氧苯甲酸反应以定量产率得到了8元环碳酸酯(14)。