Highly Enantioselective Organocatalytic Sulfa-Michael Addition to α,β-Unsaturated Ketones
Nirmal K. Rana, Sermadurai Selvakumar and Vinod K. Singh*
*Department of Chemistry, Indian Institute of Technology, Kanpur, India 208 016, Email: vinodksiitk.ac.in
N. K. Rana, S. Selvakumar, V. K. Singh, J. Org. Chem., 2010, 75, 2089-2091.
A cinchona alkaloid-derived urea is an efficient organocatalyst for catalyzing enantioselective conjugate addition between thiols and various α,β-unsaturated ketones to provide optically active sulfides with high chemical yields and enantiomeric excess. The reaction was performed with 0.1 mol % of catalyst in toluene at room temperature.
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β-sulfido carbonyl compounds, aryl sulfides, organocatalysis