Reactions of 2-acyl-1,3-dithianes with α,β-unsaturated ketones: simple preparation of cyclohexendione monoacetals

Article abstract of DOI:10.1016/S0040-4039(01)93945-0

2-Acyl-1,3-dithianes undergo efficient Lewis acid-catalysed addition to α,β-unsaturated ketones giving δ-diketones which suffer intramolecular aldol reaction to produce cyclohex-2-en-1,4 dione monoacetals and/or cyclohex-3-en-1,2-dione monoacetals.