Lewis acid mediated addition of 2-acyl-1,3-dithianes to α,β-unsaturated ketones: Synthesis of cyclohexenedione mono-dithioacetals

Article abstract of DOI:10.1016/S0040-4020(01)80563-9

2-Acyl-1,3-dithianes undergo Lewis acid-mediated conjugate addition to α,β-unsaturated ketones to provide 1,5-diketones which suffer base-catalyzed intramolecular aldol reaction to produce monodithioacetals of cyclohex-2-en-1,4-diones and cyclohex-3-en-1,