作者:Aarón Gutiérrez Collar、Cristina Trujillo、Bruce Lockett‐Walters、Brendan Twamley、Stephen J. Connon
DOI:10.1002/chem.201901028
日期:2019.5.28
An anion‐binding approach to the problem of preparing enantioenriched γ‐lactams from enolisable anhydrides and imines is reported. A simple bisurea catalyst promotes the cycloaddition between α‐aryl succinic anhydrides and either PMP‐ or benzhydryl‐protected aldimines to provide γ‐lactams with two contiguous stereocentres (one quaternary) with complete diastereocontrol and high to excellent enantioselectivity
据报道,采用阴离子结合方法可从可水解的酸酐和亚胺制备对映体富集的γ-内酰胺的问题。一种简单的Bisurea催化剂可促进α-芳基琥珀酸酐与PMP或苯甲酰基保护的醛亚胺之间的环加成反应,从而为γ-内酰胺提供两个连续的立体中心(一个季铵盐),并具有完全的非对映体控制,并首次实现了高至优异的对映选择性。DFT研究提供了对催化剂作用方式和观察到的立体控制的起源的见解。