Redox-configurable ambidextrous catalysis: structural and mechanistic insight
作者:Shahab Mortezaei、Noelle R. Catarineu、Xueyou Duan、Chunhua Hu、James W. Canary
DOI:10.1039/c5sc02144h
日期:——
A helically chiral copper complex is used as a switchable asymmetric catalyst capable of delivering either enantiomer of a Michael addition reaction.
一个螺旋手性铜配合物被用作可切换的不对称催化剂,能够提供Michael加成反应的任一对映体。
ASYMMETRIC CATALYSTS
申请人:Canary James
公开号:US20150112066A1
公开(公告)日:2015-04-23
The present invention relates to asymmetric catalysts, including redox-reconfigurable asymmetric catalysts. Methods of producing compounds having one or more stereocenters using the asymmetric catalysts of the present invention are also disclosed.
A Redox-Reconfigurable, Ambidextrous Asymmetric Catalyst
作者:Shahab Mortezaei、Noelle R. Catarineu、James W. Canary
DOI:10.1021/ja302283s
日期:2012.5.16
A redox-reconfigurable catalyst derived from L-methionine and incorporating catalytic urea groups has been synthesized. This copper complex catalyzes the enantioselective addition of diethyl malonate to trans-beta-nitrostyrene. Either enantiomer of the product can be predetermined by selection of the oxidation state of the copper ion. Enantiomeric excesses of up to 72% (S) and 70% (R) were obtained in acetonitrile. The ability of the catalyst to invert enantiomeric preference was reproduced with several different solvents and bases. Facile interconversion between the Cu2+ and Cu+ redox states allowed easy access to both active helical forms of the complex and, therefore, dial-in enantioselectivity.