Enantioselective Protonation in the Sulfa-Michael Addition Using Chiral Squaramides as Hydrogen-Bonding Organocatalysts
作者:Fener Chen、Le Dai、Hongjun Yang、Jingze Niu
DOI:10.1055/s-0031-1290113
日期:2012.1
An enantioselective protonation of transient enolate generated in sulfa-Michael addition was investigated. Various α-substituted acrylic derivatives and thiols were examined as substrates. α-Benzyl acrylimide gave the best results in terms of chemical yield and enantioselectivity (up to 93% yield and 92% ee)