The formation of alpha,beta-unsaturated oxathiolanes 2 from alpha,beta-unsaturated carbonyl derivatives was achieved selectively and in high yields using the heterogeneous catalyst APSG(.)HCI. (C) 2002 Elsevier Science Ltd. All rights reserved.
α,β-Unsaturated 1,3-oxathiolanes as masked heterodienes in the thio Diels–Alder reaction with styrene derivatives
The cycloaddition reactions of various alkyl and aryl substituted alpha,beta-unsaturated 1,3-oxathiolanes with styrene derivatives led to dihydrothiapyrans in the presence of TiCl4. Some mechanistic aspects of the cycloaddition are presented. (C) 2003 Elsevier Science Ltd. All rights reserved.