Synthesis of chiral 4-hydroxy-2,3-unsaturated carbonyl compounds from 3,4-epoxy alcohols by oxidation: application in the formal synthesis of macrosphelide A
摘要:
An interesting transformation during the oxidation of 3,4-epoxy alcohols 1a-d, derived from the corresponding homoallylic alcohols, led to the formation of 4-hydroxy-2,3-unsaturated carbonyls 2a-d in very good yields. One of these products 2c was transformed into the functionalised carboxylic acid 5, an advanced stage intermediate from which the total synthesis of macrosphelide A has been reported. (C) 2003 Elsevier Ltd. All rights reserved.
Studies on radical cyclization of 2,3-epoxy alcohols containing a β-(alkoxy)acrylate moiety using Cp2TiCl
作者:Tushar Kanti Chakraborty、Rajarshi Samanta、Krishnan Ravikumar
DOI:10.1016/j.tetlet.2007.06.139
日期:2007.9
Radical-mediated opening of chiral 2,3-epoxy alcohols, containing suitably positioned beta-(alkoxy)acrylate moieties, using Cp2TiCl triggered intramolecular cyclization to give tetrahydrofuran and tetrahydropyran moieties. (C) 2007 Elsevier Ltd. All rights reserved.