The preparation of 6β,7β-dihydroxy-3α,5-cycloandrostan-17-one and 2β,17β-diacetoxy-6α-hydroxy-3α,5-cycloandrostane and their reaction with hydrobromic acid in acetic acid is described. They both afford the corresponding 4-methylestratriene accompanied by, in the case of the former, an anthrasteroid and in the case of the latter. 17β-acetoxy-5α-androst-2-en-6-one and the related 2- and 3-bromo-6-ones.
J. R. Hanson and S. G. Knights, J. Chem. Soc., Perkin Trans. 1, 1980, 1306 DOI: 10.1039/P19800001306
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