Enantioselective Total Synthesis of Cerorubenic Acid-III via Type II [5+2] Cycloaddition Reaction
作者:Xin Liu、Junyang Liu、Jianlei Wu、Chuang-Chuang Li
DOI:10.1021/acs.joc.1c00185
日期:2021.8.20
The first enantioselective total synthesis of cerorubenic acid-III is described in detail. Different strategies and attempts, based on a type II [5+2] cycloaddition reaction, leading to the bicyclo[4.4.1] ring system with a strained bridgehead double bond, are depicted. Furthermore, sodium naphthalenide was found to be efficient in the chemoselective reduction of 8-oxabicyclo[3.2.1]octene, with three
详细描述了第一个对映选择性全合成蜡红烯酸-III。描述了不同的策略和尝试,基于 II 型 [5+2] 环加成反应,导致双环 [4.4.1] 环系统具有应变桥头双键。此外,发现萘钠在化学选择性还原 8-氧杂双环 [3.2.1] 辛烯方面是有效的,在一次操作中完成了三个转化。应用了一种不寻常的 S N 1 环化反应来构建具有合成挑战性的乙烯基环丙烷部分。该策略能够在 19 步中全合成 Cerorubenic acid-III。