Asymmetric Conjugate Alkenylation of Enones Catalyzed by Chiral Diols
摘要:
Reaction of dimethyl alkenylboronates with alpha,beta-unsaturated ketones in the presence of catalytic amounts of 3,3'-disubstituted binaphthols provides conjugate alkenylation products in good yields and with generally high (similar to 99:1 er) stereoselectivities.
Asymmetric 1,4-addition of alkenylzirconium reagents to α,β-unsaturated ketones catalyzed by chiral rhodium complexes
作者:Shuichi Oi、Takashi Sato、Yoshio Inoue
DOI:10.1016/j.tetlet.2004.04.171
日期:2004.6
Highly enantioselective 1,4-addition of alkenylzirconocene chlorides to alpha-enones Was found to be catalyzed by a chiral rhodium complex generated from [Rh(cod)(MeCN)(2)]BF4 and (S)-BINAP. The reaction can be applied to either cyclic or acyclic enones and the optical yield was LIP to 99% ee. The reaction mechanism would involve the transmetalation between the alkenylzirconocene chloride and the rhodium complex to give the alkenylrhodium species as a key intermediate. (C) 2004 Elsevier Ltd. All rights reserved.
Asymmetric Conjugate Alkenylation of Enones Catalyzed by Chiral Diols
作者:T. Robert Wu、J. Michael Chong
DOI:10.1021/ja0713734
日期:2007.4.1
Reaction of dimethyl alkenylboronates with alpha,beta-unsaturated ketones in the presence of catalytic amounts of 3,3'-disubstituted binaphthols provides conjugate alkenylation products in good yields and with generally high (similar to 99:1 er) stereoselectivities.