A highly enantioselective cyanation of imines (up to >99 % ee) has been developed using well-designed C2-symmetric hydrogen bonding catalysts. This catalytic system is distinguished by its lowcatalystloading (S/C up to 1000), high efficiency, extremely broad substrate scope, scalability and mild reaction conditions.
使用精心设计的 C 2对称氢键催化剂开发了亚胺的高度对映选择性氰化(高达 >99 % ee)。该催化体系的特点是催化剂负载量低(S/C高达1000)、效率高、底物范围极广、可扩展性和反应条件温和。
Enantioselective Strecker-type reaction of phosphinoyl ketimines catalyzed by a chiral Zr-bipyridyldiol catalyst
作者:Yi-Jing Chen、Chinpiao Chen
DOI:10.1016/j.tetasy.2008.09.011
日期:2008.9
An enantioselective Strecker reaction of N-diphenylphosphinoyl ketimines with TMSCN employing a chiral zirconium complex formed from chiral bipyridyl diol 1 as catalyst is described. The catalytic efficiency of chiral ligand 1 with other Lewis acids was also explored. Higher yields (50-85%) with moderate to good enantioselectivities (30-80%) were achieved for a variety of N-diphenylphosphinoyl ketimines. (C) 2008 Elsevier Ltd. All rights reserved.