作者:Chih‐Ming Chen、Hui‐Yi Shiao、Biing‐Jiun Uang、Hsing‐Pang Hsieh
DOI:10.1002/anie.201809130
日期:2018.11.19
The first total synthesis of isopalhinine A, as well as unified syntheses of palhinine A and palhinine D, were successfully accomplished by means of a biomimetic strategy that proceeds through a bioinspired 5/6/6/9 tetracyclic intermediate, which mimics the amino ketone form of palhinine D. An early‐stage direct SN2 cyclization to construct the nine‐membered azonane ring minimized the transannular
通过仿生策略成功完成了异palhinine A的第一个全合成,以及palhinine A和palhinine D的统一合成,该策略通过仿生氨基酮形式的受生物启发的5/6/6/9四环中间体进行早期直接S N 2环化以构建九元氮杂环丁烷环使跨环应变减至最小,否则异环烷骨架的扭曲性质会增加跨环应变。然后,对位邻位的非对映选择性Diels-Alder反应使用九元环作为空间屏蔽基团的苯醌可提供功能化的6/6/9三环骨架,并一步一步在C3,C7,C12和C15位置建立所需的立体化学。硫醇介导的酰基自由基环化作用使该受生物启发的中间体带有三个不同的含氧官能团,从中可以通过两个或三个附加步骤完成全部三个合成过程。