作者:Sandip A. Pujari、Parthasarathy Gowrisankar、Krishna P. Kaliappan
DOI:10.1002/asia.201100429
日期:2011.11.4
A formal total synthesis of palmerolide A has been accomplished by assembling three fragments by means of successive Julia–Kocienski olefination, Yamaguchi esterification, and ring‐closing metathesis (RCM). Our initial efforts to combine the first two fragments through a Julia–Kocienski reaction between a secondary sulfone and a ketone were not successful; nevertheless, it was feasible between a primary
棕榈油内酯A的正式总合成是通过依次进行Julia-Kocienski烯烃化,Yamaguchi酯化和闭环复分解(RCM)组装三个片段来完成的。我们最初的尝试是通过仲砜和酮之间的Julia-Kocienski反应将前两个片段结合在一起,但没有成功。然而,在伯砜和醛之间是可行的。然后用第三片段进行山口酯化,为RCM反应奠定基础。RCM最初的失败之处是与烯烃相邻的PMB-醚以及裂解PMB-醚的困难促使我们改变了保护基的选择,继而为棕榈油内酯A的大环核心铺平了道路。