Bismuth(III) salt-catalyzed Westphalen and “backbone” rearrangements of 5β,6β-epoxysteroids
作者:Rui M.A. Pinto、Jorge A.R. Salvador、Christophe Le Roux、Rui A. Carvalho、Manuela Ramos Silva、Ana Matos Beja、José A. Paixão
DOI:10.1016/j.steroids.2008.01.006
日期:2008.5
bismuth(III) salts as catalysts for the Westphalen and "backbone" rearrangements of 5 beta,6 beta-epoxysteroids is reported. This method is particularly sensitive to changes on solvent, temperature, stereochemistry of starting epoxysteroid, and its substituent at C17. Depending on the reaction conditions, either Westphalen-type or "backbone" rearranged products were obtained, all being 3 beta-acetoxy-6 beta