Et3N catalyzed direct α-addition cascade isomerization of deconjugated butenolides with α-ketoesters for the synthesis of α,γ-disubstituted butenolide derivatives
作者:Zhe-Yao Huang、Hong Yang、Lin Zhou、Qing-Han Li、Zhi-Gang Zhao
DOI:10.1016/j.tet.2022.132740
日期:2022.4
γ-disubstituted butenolides are widespread occurrences in numerous pharmacologically active molecules. In this paper, a highly efficient method for the synthesis of α,γ-disubstituted butenolide derivatives via a direct α-addition cascade isomerization of deconjugated butenolides with α-ketoesters using Et3N as catalyst, has been successfully developed. A series of α,γ-disubstituted butenolides have been
α,γ-二取代丁烯内酯广泛存在于许多药理活性分子中。本文成功开发了一种以 Et 3 N 为催化剂,通过去共轭丁烯内酯与 α-酮酯直接 α-加成级联异构化合成 α,γ-二取代丁烯内酯衍生物的高效方法。一系列 α,γ-二取代丁烯内酯的产率高达 97%,具有优异的区域选择性(高达 >19/1 rr)。据我们所知,迄今为止,在直接α-加成级联异构化制备α,γ-二取代丁烯内酯中应用去共轭丁烯内酯尚无先例。