Enantioselective Addition of Secondary Phosphines to Methacrylonitrile: Catalysis and Mechanism
作者:Aaron D. Sadow、Antonio Togni
DOI:10.1021/ja0555163
日期:2005.12.1
(Pigiphos)nickel(II)-catalyzed reaction of secondary phosphines and methacrylonitrile gives chiral 2-cyanopropylphosphines in good yield and high enantiomeric excess (ee's up to 94%; (R)-(S)-Pigiphos = bis[(R)-1-[(S)-2-(diphenylphosphino)ferrocenyl]ethyl}cyclohexylphos phine). We propose a mechanism involving coordination of methacrylonitrile to the dicationic nickel catalyst followed by 1,4-addition of