Title:Amine-Squaramide Catalyzed Asymmetric Michael Addition of Cyclic
Diketones and β,γ-unsaturated α-keto Esters
Volume: 19
Issue: 11
Author(s): Zhi-Jing Liu, Zhi-Wei Ma*, Xiao-Pei Chen, Chuan-Chuan Wang, Jun-Tao Liu and Jing-Chao Tao
Affiliation:
- Faculty of Science, Henan University of Animal Husbandry and Economy, Zhengzhou 450046, P.R. China
Keywords:
Michael addition, organocatalysis, tertiary amine-squaramide, cyclic diketone, βγ-unsaturated α-ketoesters, isosteviol derivative.
Abstract: A novel tertiary amine squaramide has been successfully developed and applied to catalyze
the asymmetric Michael addition between cyclic diketones and β,γ-unsaturated α-ketoesters. The catalyst
system performed well with a low catalyst loading of 1 mol% under mild reaction conditions. A
series of synthetically and pharmaceutically useful chiral bicyclic compounds were obtained with both
high yields (up to 97%) and excellent enantioselectivities (up to 97% ee).