COAP‐Palladium‐catalyzed Asymmetric Linear Allylic Alkylation of Vinyl Benzoxazinanones for Multifunctional 3,3′‐Disubstituted Oxindole Derivatives
作者:Jun-Hao Shen、Sheng-Suo Zhou、Bai-Lin Wang、Wen-Kai Liu、Zheng Wang、Xing-Wang Wang
DOI:10.1002/adsc.202201404
日期:——
developed protocol demonstrates that the COAP ligands could serve as a privileged chiral ligand to construct diverse chiral 3,3-disubstituted oxindole compounds with various quaternary stereogenic centers, such as aza-, thio- or all-carbon quaternary stereogenic centers. The salient features of the method include broad substrate scope, N-protecting group free, base-free, and high regio- and enantioselectivity
据报道,在温和反应条件下,在手性草酰胺-膦配体 (COAP-Bn) 存在下,Pd 催化的乙烯基苯并恶嗪酮与一系列 3-取代羟吲哚的对映选择性线性-烯丙基烷基化反应。一系列具有季立体异构中心和线性芳基氨基侧链的光学活性多功能 3,3'-二取代羟吲哚衍生物分别以 55-98% 的产率和 96-99% ee 的3-(杂)芳基取代羟吲哚获得. 开发的方案表明,COAP 配体可以作为一种特殊的手性配体来构建具有各种季立体异构中心(如氮杂-、硫代)的多种手性 3,3-二取代羟吲哚化合物- 或全碳季立体中心。该方法的显着特点包括广泛的底物范围、无N-保护基、无碱基以及高区域选择性和对映选择性。