Oxidation of congested thiophene 1,1-dioxides with m-chloroperbenzoic acid. Formation of epoxides vs. ring-contracted thiete 1,1-dioxides
作者:Juzo Nakayama、Hiroaki Kamiyama
DOI:10.1016/s0040-4039(00)60818-3
日期:——
Highly congested thiophene 1,1-dioxides, which carry two bulky substituents at 3- and 4-positions, afford the corresponding epoxides in high yields on oxidation with m-chloroperbenzoic acid in the presence of sodium carbonate, while the oxidation in the absence of sodium carbonate gives the ring-contracted thiete 1,1-dioxides as the principal product.
高度拥塞噻吩1,1-二氧化物,其携带在3-两个大体积的取代基和4-位,得到在氧化高产率与相应的环氧化物米在碳酸钠的存在下氯过苯甲酸,同时在不存在的氧化碳酸钠得到的主要产物是缩环的1,1-二氧化物。