Synthesis of Enantiomerically Pure Dihydrofurans and Dihydropyrans from Common Precursors Using RCM and Tandem RCM-Isomerization
作者:Bernd Schmidt、Anne Biernat
DOI:10.1055/s-2007-985606
日期:2007.9
Starting from glyceraldehyde, structurally and stereo-chemically diverse dihydrofurans and dihydropyrans with a 1,2-dihydroxyethylene side chain can be accessed in few steps via allyl metal addition, O-allylation and ring-closing metathesis (RCM) or tandem RCM-isomerization, respectively. The synthesis of di-hydrofurans requires a selective double-bond isomerization on the homoallylic alcohol stage
从甘油醛开始,可以通过烯丙基金属加成、O-烯丙基化和闭环复分解 (RCM) 或串联 RCM 异构化,通过几个步骤获得结构和立体化学上不同的二氢呋喃和具有 1,2-二羟基乙烯侧链的二氢吡喃,分别。在 O-烯丙基化和 RCM 或 RCM 异构化之前,二氢呋喃的合成需要在高烯丙醇阶段进行选择性双键异构化。