The Highly Stereoselective Michael Reaction of α,β-Unsaturated Ketones with Silyl Enol Ethers of Thioesters Catalyzed by Trityl Salts. A Facile Stereoselective Synthesis of 5-Oxocarboxylic Acid Ester Derivatives

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Abstract
In the presence of a catalytic amount of trityl salts, silyl enol ethers of thioesters stereoselectively react with α,β-unsaturated ketones to afford the Michael adducts in high yields. 5-Oxocarboxylic acid ester derivatives, useful synthetic precursors of various naturally occurring compounds, are stereoselectively obtained by this procedure.

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