Engineering Polymer-Enhanced Bimetallic Cooperative Interactions in the Hydrolytic Kinetic Resolution of Epoxides
作者:Xiaolai Zheng、Christopher W. Jones、Marcus Weck
DOI:10.1002/adsc.200700339
日期:2008.1.25
oligo(ethylene glycol)-based linkers and the catalyst density of poly(styrene)-supported cobalt-salen catalysts, we have elucidated an optimal catalyst flexibility and density of polymeric Co-salen catalysts for the hydrolytic kinetic resolution (HKR) of racemic terminal epoxides that follows a bimetallic cooperative pathway. The optimized polymeric catalyst brings the two cooperative Co-salen units to
通过系统地改变基于低聚乙二醇的连接基的长度和聚苯乙烯负载的钴-salen催化剂的催化剂密度,我们为水解动力学阐明了最佳的催化剂柔韧性和聚合的Co-salen催化剂的密度。双金属协作路径的外消旋末端环氧化物的最大分离度(HKR)。优化的聚合物催化剂可有效地使两个协同共沙仑单元达到良好的接近度,因此与其单体小分子类似物相比,在HKR中显示出显着改善的催化性能。复杂的Co(5b)中,代表最活跃的聚(苯乙烯)迄今已知的-支持HKR催化剂,可以实现的各种环氧化物的分辨率达到≥98%ee值 在6–24小时内,钴含量低至0.01–0.1 mol%。