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.
Blue LED-Promoted Oxathiacetalization of Aldehydes and Ketones
作者:You-Chen Liu、Daggula Mallikarjuna Reddy、Xin-An Chen、Yi-Chen Shieh、Chin-Fa Lee
DOI:10.1002/ejoc.202000218
日期:2020.5.10
A visible‐light‐promoted oxathiacetalization of aldehydes and ketones with 2‐mercaptoethanol and 3‐mercaptopropan‐1‐ol in the presence of eosin Y as catalyst is described leading to the formation of 1,3‐oxathiolanes and 1,3‐oxathianes at ambient temperature and under metal‐free conditions. The solvent is playing vital role in the protection of carbonyl compounds with mercaptoalcohol.