Enhanced Cooperativity in Hydrolytic Kinetic Resolution of Epoxides using Poly(styrene) Resin-Supported Dendronized Co-(Salen) Catalysts
作者:Poorva Goyal、Xiaolai Zheng、Marcus Weck
DOI:10.1002/adsc.200800175
日期:2008.8.4
enantioselectivities and isolated yields have been achieved for the hydrolytic kinetic resolution of epoxides using a resin-supported dendronized R,R-(salen)Co catalyst with catalyst loadings as low as 0.04 mol%, the lowest metal loadings of any heterogeneous resin-supported (salen)Co catalyst reported to date. In addition, the supported catalysts can be recycled and reused with comparable enantioselectivities
使用树脂负载的树枝状R,R-(salen)Co催化剂,催化剂负载量低至0.04 mol%,所有非均质树脂负载的最低金属负载量,都可以实现出色的对映选择性和分离的收率,从而实现环氧化物的水解动力学拆分迄今为止报道的(salen)Co催化剂。另外,负载的催化剂可以以相当的对映选择性被回收和再利用。据推测,高催化活性可以归因于柔性连接体和在树脂上支撑(salen)Co部分的树枝状骨架,从而促进了两个金属中心之间的协同作用。这项工作为设计高活性树脂负载型催化剂(通过双金属途径催化转化)开辟了新的机遇。