Copper-Catalyzed Enantioselective Henry Reaction of β,γ-Unsaturated α-Ketoesters with Nitromethane in Water
作者:Yanan Li、Yekai Huang、Yang Gui、Jianan Sun、Jindong Li、Zhenggen Zha、Zhiyong Wang
DOI:10.1021/acs.orglett.7b03299
日期:2017.12.1
A highly enantioselective Henry reaction of β,γ-unsaturated α-ketoesters with nitromethane in water by virtue of chiral copper complexes has been developed. A series of unsaturated β-nitro-α-hydroxy esters bearing tetrasubstituted carbon stereocenters were obtained exclusively with high yields and excellent enantioselectivities. This method could avoid tedious anaerobic anhydrous manipulation and reduce
Asymmetric Construction of Highly Functionalized Cyclobutanones Bearing Three Contiguous Stereogenic Centers by an Amino Acid Salt-Catalyzed Desymmetrization Reaction
作者:Jingjie Wu、Fengda Bao、Xiaoxia Ye、Jun Jiang、Juan Li
DOI:10.1055/s-0040-1719931
日期:2022.10
We report an aminoacid salt-catalyzed direct desymmetrization of 3-substituted cyclobutanones through a directaldolreaction under mild reaction conditions. The developed method provides an array of highly functionalized cyclobutanones bearing three contiguous stereogenic centers in high yields and stereoselectivities with varied functional-group compatibility. Furthermore, the obtained adducts can
An asymmetric Michael addition of diphenylphosphine to (beta,gamma-unsaturated alpha-keto esters was developed using a P-stereogenic pincer-Pd complex as a catalyst. The corresponding hydrophosphination products were obtained in good yields (up to 94%) and with moderate to good enantioselectivities (up to 93% ee) under the optimum reaction conditions. (C) 2015 Elsevier Ltd. All rights reserved.