Chemoselective Rh-Catalyzed Allylic Alkylations of Chelated Enolates using Dienylcarbonates
作者:Saskia Hähn、Uli Kazmaier
DOI:10.1002/ejoc.201100350
日期:2011.7.14
catalyst not only for highly regio- but also chemoselective allylic alkylations of chelated enolates. In contrast to Pd-catalyzed reactions, the Rh-catalyzed version shows also a high degree of regioretention and proceeds without isomerization. Allylic substrates with competitive allylic subunits react selectively at the sterically least hindered allylic position, in comparison to Ru-catalyzed processes
威尔金森的催化剂 RhCl(PPh3)3 被发现是一种优异的催化剂,不仅适用于高度区域性的,而且也适用于螯合烯醇化物的化学选择性烯丙基烷基化。与 Pd 催化的反应相反,Rh 催化的反应也显示出高度的区域保留,并且在没有异构化的情况下进行。与 Ru 催化过程相比,具有竞争性烯丙基亚基的烯丙基底物在空间位阻最小的烯丙基位置选择性地反应。