Hypocholesterolemic agents. 8. Synthesis of 25-azadihydrolanosterol and derivatives
作者:Raymond E. Counsell、Matthias C. Lu、Fortune Kohen
DOI:10.1021/jm00284a013
日期:1971.2
A low-toxicity method for the separation of lanosterol and dihydrolanosterol from commercial mixtures
作者:Levan K. Kavtaradze、Merilyn Manley-Harris、Brian K. Nicholson
DOI:10.1016/j.steroids.2004.07.003
日期:2004.9
We describe an inexpensive, low-toxicity and high-yielding method for the production of pure lanosterol and dihydrolanosterol from the commercially available mixture. Optimum conditions are presented for the one-pot production of the intermediate 24,25 vicinal diol of lanosterol acetate (via either epoxidation or hydroxyhalogenation) which is readily separated from the unreacted dihydrolanosterol acetate. The lanosterol diol can then be converted to pure (>97%) lanosterol. Hypophosphorous acid was used for both the conversion of the epoxide to the diol, and as a catalyst for the hydroxyhalogenation by N-halosuccinimides of the olefinic bond. (C) 2004 Elsevier Inc. All rights reserved.