Organocatalytic asymmetric conjugate addition of cyclic 1,3-dicarbonyl compounds to β,γ-unsaturated α-ketoesters
作者:Jin-jia Wang、Jin-hua Lao、Zhi-peng Hu、Rui-Jiong Lu、Shao-zhen Nie、Quan-sheng Du、Ming Yan
DOI:10.3998/ark.5550190.0011.922
日期:——
The conjugateaddition of cyclic1,3-dicarbonylcompounds to β,γ-unsaturated α-keto-esters was studied using a series of chiral bifunctional organocatalysts. Takemoto’s catalyst was found to be most efficient for this transformation. Excellent yields and good enantioselectivities were achieved for a variety of β,γ-unsaturated α-keto-esters and cyclic1,3-dicarbonylcompounds. A bifunctional catalytic
Amine-Squaramide Catalyzed Asymmetric Michael Addition of Cyclic
Diketones and β,γ-unsaturated α-keto Esters
作者:Zhi-Wei Ma、Zhi-Jing Liu、Xiao-Pei Chen、Chuan-Chuan Wang、Jun-Tao Liu、Jing-Chao Tao
DOI:10.2174/1570178619666220314152530
日期:2022.11
applied to catalyze the asymmetric Michaeladdition 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).