Iodine-Catalyzed Highly Diastereoselective Synthesis of<i>trans</i>-2,6-Disubstituted-3,4-Dihydropyrans: Application to Concise Construction of C28-C37 Bicyclic Core of (+)-Sorangicin A
作者:Debendra K. Mohapatra、Pragna P. Das、Manas Ranjan Pattanayak、J. S. Yadav
DOI:10.1002/chem.200902999
日期:2010.2.15
A novel iodine‐catalyzed highly diastereoselective synthesis of trans‐2,6‐disubstituted‐3,4‐dihydropyrans have been achieved from δ‐hydroxy α,β‐unsaturated aldehydes by treating with allyltrimethyl silane in THF at room temperature with good to excellent yields. This methodology has been successfully implemented for a concise asymmetric synthesis of C28–C37 dioxabicyclo[3.2.1]octane ring system of
通过在室温下用烯丙基三甲基硅烷在THF中处理,从δ-羟基α,β-不饱和醛中获得了一种新颖的碘催化高非对映选择性合成反式-2,6-二取代-3,4-二氢吡喃的化合物。。该方法已成功地实现了(+)-sorangicin A的C28-C37二恶双环[3.2.1]辛烷环系统的简洁不对称合成,共分8个步骤,总收率为21%。