作者:Jing-chun Han、Fuzhuo Li、Chuang-chuang Li
DOI:10.1021/ja5084927
日期:2014.10.1
been developed for the concise and asymmetric synthesis of seven humulanolides in 5-7 steps without the need for protecting groups. Notably, the challenging 11-membered ring and bridged butenolide moieties in asteriscunolide D and 6,7,9,10-tetrahydroasteriscunolide were introduced in one step using a ring-opening/ring-closing metathesis cascade reaction. Asteriscunolide D was used as a versatile synthetic
已开发出一种新方法,无需保护基团即可在 5-7 步中简洁且不对称地合成七种葎草酸内酯。值得注意的是,使用开环/闭环复分解级联反应一步引入了星形内酯 D 和 6,7,9,10-四氢星形内酯中具有挑战性的 11 元环和桥连丁烯内酯部分。Asteriscunolide D 被用作通用合成前体,通过光致异构化反应制备 asteriscunolides AC,通过独特的跨环迈克尔反应制备 asteriscanolide,以及通过跨环 Morita-Baylis-Hillman 型反应制备 6,7,9,10-tetradehydroasteriscanolide。非对映选择性地引入了独特的双环[6.3.0]十一烷核。