Synthesis of (±)-gallocatechin and (±)-epigallocatechin gallates by electrophilic cycloarylation is reported. The precursors for cyclization were prepared by reagent-controlled stereo-selective opening of epoxide with phenol. Activation of the S-oxidized S,O-acetal enabled electrophilic cycloarylation to stereoselectively provide the acylated catechins.
报道了通过亲电环芳基化反应合成(±)-没食子
儿茶素和(±)-表
没食子儿茶素没食子酸酯。用于环化的前体是通过试剂控制的
酚与
酚的立体选择性开环而制得的。在激活小号-oxidized小号,Ø -acetal启用电子cycloarylation立体选择性地提供酰化的
儿茶素。