Hydrazine sulphate: a cheap and efficient catalyst for the regioselective ring-opening of epoxides. A metal-free procedure for the preparation of β-alkoxy alcohols
作者:Alcino J.L. Leitão、Jorge A.R. Salvador、Rui M.A. Pinto、M. Luísa Sá e Melo
DOI:10.1016/j.tetlet.2007.12.121
日期:2008.3
An efficient and general procedure for the regioselective ring opening of epoxides with alcohols to afford the corresponding beta-alkoxy alcohols, using hydrazine sulphate as catalyst, is described. This new metal-free process was found to be highly versatile allowing the use of primary, secondary and tertiary alcohols as nucleophiles and a large variety of epoxides, including 5 alpha,6 alpha-, 5 beta,6 beta- and 2 alpha,3 alpha-epoxysteroids, as substrates. (c) 2008 Elsevier Ltd. All rights reserved.