α-Alkoxycarbonylketene dithioacetals (1) were smoothly reduced by the higher order cyanocuprate Me2Cu(CN)Li2 at –20 °C to the corresponding vinyl sulphides (2) in high yields, with high stereoselectivity and generality.
M. Hojo and S. Tanimoto, J. Chem. Soc., Chem. Commun., 1990, 1284 DOI: 10.1039/C39900001284
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