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)
研究了在硫-Michael加成反应中产生的瞬时烯醇化物的对映选择性质子化。考察了各种α-取代丙烯酸衍生物和硫醇作为底物。α-苄基丙烯酰亚胺在化学产率和对映选择性方面给出了最佳结果(产率高达93%,对映选择性高达92% ee)。