Stereoselective Synthesis of Tetrahydropyrans through Tandem and Organocatalytic Oxa-Michael Reactions: Synthesis of the Tetrahydropyran Cores of ent-(+)-Sorangicin A
作者:Kiyoun Lee、Hyoungsu Kim、Jiyong Hong
DOI:10.1002/ejoc.201101549
日期:2012.2
Tandem and organocatalytic oxa-Michael reactions of α,β-unsaturated aldehydes were explored for the stereoselective synthesis of structurally complex tetrahydropyrans. Thestereoselective synthesis of 2,6-trans-tetrahydropyrans, which are thermodynamically unfavorable, was accomplished through a reagent-controlled, organocatalytic oxa-Michael reaction. A temperature-dependent configurational switch
探索了 α,β-不饱和醛的串联和有机催化 oxa-Michael 反应以立体选择性合成结构复杂的四氢吡喃。热力学上不利的 2,6-反式四氢吡喃的立体选择性合成是通过试剂控制的有机催化 oxa-Michael 反应完成的。温度依赖性配置开关允许从共同的底物制备 2,3-trans-2,6-trans- 和 2,3-cis-2,6-cis-tetrahydropyrans。然后使用该开关合成 ent-(+)-sorangicin A 的 C21-C29 和 C30-C37 片段的前体。