Aminoketene dithioacetals react with α,β-unsaturated ketones to give δ-diketones which undergo Robinson annelation to provide monoacetals of cyclohex-2-ene-1,4-diones in up to quantitative yields.
P. C. B. Page and M. B. van Niel, J. Chem. Soc., Chem. Commun., 1987, 43 DOI: 10.1039/C39870000043
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