S,S′-Diethyl dithiomalonate 1 undergoes concomitant alkylation reaction and Michael addition with ω-iodo-α,β-unsaturated ketones; the dithiomalonate group present in the cyclization products can be easily reduced by Raney nickel to the ethanol level.
H. Liu and Y. Han, J. Chem. Soc., Chem. Commun., 1991, 1484 DOI: 10.1039/C39910001484
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