Constructing Quaternary Stereogenic Centers Using Tertiary Organocuprates and Tertiary Radicals. Total Synthesis of <i>trans</i>-Clerodane Natural Products
作者:Daniel S. Müller、Nicholas L. Untiedt、André P. Dieskau、Gregory L. Lackner、Larry E. Overman
DOI:10.1021/ja512527s
日期:2015.1.21
A new concise construction of trans-clerodane diterpenoids is reported in which oxacyclic and trans-hydronaphthalene fragments are coupled, and the critical C9-quaternary carbon stereocenter formed stereoselectively, by 1,6-addition of a tertiary cuprate or a tertiary carbon radical to β-vinylbutenolide. This strategy is specifically illustrated by total syntheses of (-)-solidagolactone (4), (-)-16-hydroxycleroda-3
报道了一种新的反式克罗丹二萜类化合物的简明结构,其中氧杂环和反式氢化萘片段偶联,并且通过叔铜酸盐或叔碳自由基的 1,6-加成立体选择性地形成了关键的 C9-季碳立体中心-乙烯基丁烯内酯。该策略通过 (-)-solidagolactone (4)、(-)-16-hydroxycleroda-3,13-dien-15,16-olide (5, PL3) 和 (-)-annonene 的全合成得到具体说明。 6).