A series of α,β-unsaturated 1,3-oxathiolanes reacted with aliphatic olefins such as norbornene and with various 1,3-dienes in the presence of TiCl4 leading to dihydrothiapyrans, via a cycloaddition-type reaction. The unsaturated oxathiolanes acted as masked heterodienes in this thio Diels–Alderreaction.
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.
Rana; Guin; Banerjee, Journal of the Indian Chemical Society, 2003, vol. 80, # 11, p. 1005 - 1006
作者:Rana、Guin、Banerjee、Roy
DOI:——
日期:——
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.