Organocatalytic Asymmetric Conjugate Addition and Cascade Acyl Transfer Reaction of α-Nitroketones
作者:Rui-jiong Lu、Yun-yun Yan、Jin-jia Wang、Quan-sheng Du、Shao-zhen Nie、Ming Yan
DOI:10.1021/jo2009752
日期:2011.8.5
Organocatalytic asymmetric conjugate addition of α-nitroketones to β,γ-unsaturated α-keto esters has been developed. A pyrrolidine-based thiourea–tertiary amine was identified as the best catalyst. The reaction was found to proceed via cascade conjugate addition and acyl transfer reaction. A number of α-nitroketones and β,γ-unsaturated α-keto esters were examined in this transformation. 5-Nitro-2-