Efficient routes to epimerically-pure side-chain derivatives of lanosterol☆
作者:Levan K. Kavtaradze、Merilyn Manley-Harris、Brian K. Nicholson
DOI:10.1016/j.steroids.2003.12.004
日期:2004.4
A technically simple route is described to individual epimers of side-chain derivatives of lanosterol (3beta-hydroxy-5alpha-lanosta-8,24-diene). Epimerically pure 24,25-epoxy-, 24,25-dihydroxy- and 24-bromo-25-hydroxy-lanosterol have been prepared in good yield from commercial (50-60%) lanosterol. Hypophosphorous acid was used as a catalyst for the cohalogenation of the Delta24(25) bond and also for