Addition of aromatic thiols to conjugated cycloalkenones, catalyzed by chiral .beta.-hydroxy amines. A mechanistic study of homogeneous catalytic asymmetric synthesis
作者:Henk Hiemstra、Hans Wynberg
DOI:10.1021/ja00392a029
日期:1981.1
Highly Enantioselective Organocatalytic Sulfa-Michael Addition to α,β-Unsaturated Ketones
作者:Nirmal K. Rana、Sermadurai Selvakumar、Vinod K. Singh
DOI:10.1021/jo902634a
日期:2010.3.19
A cinchona alkaloid-derived urea was found to be an efficientorganocatalyst for catalyzing enantioselective conjugate addition between thiols and various α,β-unsaturated ketones to provide opticallyactive sulfides with high chemical yields (up to >99%) and enantiomeric excess (up to >99% ee). The reaction was performed with 0.1 mol % of catalyst in toluene at room temperature. A transition state