The Trityl Cation Mediated Michael Reaction of Ethylthioketene Dithioacetals with Silyl Enol Ethers

Abstract

Abstract In the presence of trityl tetrafluoroborate, 2-(2-ethylthioalkylidene)-1,3-dithiolanes smoothly react with silyl enol ethers at low temperature to afford the corresponding oxoketene dithioacetal adducts in good yields. This reaction is formally equivalent to the Michael reaction between ketone enolates and α,β-unsaturated esters.