The present invention relates to a method of enantioselective addition to enones, including: reacting R
3
(CH
2
)
p
CH═CR
5
C(═O)Y(CH
2
)
q
R
4
with R
6
ZnR
7
in the presence of a compound represented by the following formula (I) and a transition metal catalyst,
in which Y, p, q, R
1
, R
2
, R
3
, R
4
, R
5
, R
6
and R
7
are defined the same as the specification. Accordingly, the present invention can perform asymmetric conjugate addition in high yields and enantioselectivity.
Enantioselective copper-catalyzed 1,4-additions of dialkylzincs to enones were carried out in the presence of 1 mol % of Cu(OTf)(2) and 2.5 mol % of an N,N,P-ligand possessing a tert-butyl group at the adjacent position of the nitrogen of pyridine to afford the corresponding 1,4-adducts in up to 98% ee. (C) 2012 Elsevier Ltd. All rights reserved.
Enantioselective copper(II)-catalyzed conjugate addition of diethylzinc to β-substituted enones utilizing BINOL-based phosphoramidite ligands
作者:Wenxian Zhao、Tao Wang、Ruijuan Zhao、Huanping Xie、Lantao Liu
DOI:10.1016/j.tetasy.2016.01.016
日期:2016.3
A family of new chiral phosphoramidite ligands based on 3,3'-disubstituted (S)-BINOL have been successfully synthesized. The chiral phosphoramidite ligands were subsequently applied to the copper(II)-catalyzed enantioselective addition of diethylzinc to beta-substituted enones, giving the desired chiral adducts with enantioselectivities of up to 93% ee and high yields (up to 88%). (C) 2016 Elsevier Ltd. All rights reserved.
Enantioselective conjugate addition of dialkylzincs to α,β-unsaturated enones catalyzed by Ni(acac)2 and (+)-(1S,2R)-7,7-dimethyl-1-morpholinoisonorborneol
作者:Chih-Hao Tseng、Yu-Ming Hung、Biing-Jiun Uang
DOI:10.1016/j.tetasy.2012.01.010
日期:2012.1
A mixture of chiral ligand 4 [(+)-MINBOL] and Ni(acac)(2) (12.5 and 0.5 mol % respectively) is able to successfully catalyze the enantioselective conjugate 1,4-addition of dialkylzinc to alpha,beta-unsaturated enones in propionitrile to give the corresponding chiral Michael adducts in good yields and with high enantioselectivities (up to 93% ee). (C) 2012 Elsevier Ltd. All rights reserved.