Stereoselective Access to Fully Substituted Aldehyde‐Derived Silyl Enol Ethers by Iridium‐Catalyzed Alkene Isomerization
作者:Itai Massad、Heiko Sommer、Ilan Marek
DOI:10.1002/anie.202005058
日期:2020.9
An in situ generated cationic Ir‐catalyst isomerizes simple allylic silyl ethers into valuable, fully substituted aldehyde‐derived silyl enol ethers. Importantly, by judicious choice of substrate, either of the two possible stereoisomers of a given enolate derivative is accessible with complete stereoselectivity. One‐pot isomerization‐aldol and isomerization‐allylation processes illustrate the synthetic
原位生成的阳离子Ir催化剂将简单的烯丙基甲硅烷基醚异构化为有价值的,完全取代的醛衍生的甲硅烷基烯醇醚。重要的是,通过明智地选择底物,可以完全立体选择性地获得给定的烯醇衍生物的两种可能的立体异构体中的任何一种。一锅异构化-醛醇缩合和异构化-烯丙基化过程说明了该方法的综合效用。