Efficient Construction of Highly Substituted and Stereodefined cis-Fused Lactones
作者:Zobida Elkhayat、Imad Safir、Zoila Gandara、Pascal Retailleau、Siméon Arseniyadis
DOI:10.1002/ejoc.201000556
日期:2010.9
ene-acetals to spontaneously generate 6α-hydroxy-bis-acetals that could serve as precursors for a Cannizzaro-type rearrangement, yielding bis-angularly substituted cis-fused lactones. Both the oxidizing reagent, m-CPBA or NaBO 3 , and the substitution pattern can be important in determining the course of the epoxidation/ring-opening sequence, with NaBO 3 being the ideal electrophilic oxidant for the
本文描述的方法涉及环状烯-缩醛的环氧化反应,以自发生成 6α-羟基-双-缩醛,可作为 Cannizzaro 型重排的前体,产生双角取代的顺式稠合内酯。氧化剂,m-CPBA 或 NaBO 3 ,以及取代模式在确定环氧化/开环顺序的过程中都很重要,NaBO 3 是环氧化/自发开环/环的理想亲电氧化剂-系统交换序列。