The Total Synthesis of (−)-7-Deoxyloganin via <i>N</i>-Heterocyclic Carbene Catalyzed Rearrangement of α,β-Unsaturated Enol Esters
作者:Lisa Candish、David W. Lupton
DOI:10.1021/ol101983h
日期:2010.11.5
The diastereoselective N-heterocyclic carbene (NHC) catalyzed rearrangement of α,β-unsaturated enol ester (S)-2b has been used to assemble dihydropyranone (S)-3b, a material embodying the bicyclic core of the iridoid family of natural products. Elaboration of this intermediate, by chemoselective reduction followed by stereoselective β-glycosylation, has allowed the total synthesis of (−)-7-deoxyloganin
α,β-不饱和烯醇酯(S)-2b的非对映选择性N-杂环卡宾(NHC)催化的重排已用于组装二氢吡喃酮(S)-3b,该材料体现了天然产品虹彩家族的双环核。通过化学选择性还原,然后进行立体选择性β-糖基化来精制该中间体,已经可以在随后的四个步骤中完成(-)-7-脱氧loganin(1)的总合成。