17β-Acetoxy-androstane derivatives containing two potential sites of unsaturation in rings A and B undergo rearrangement to anthrasteroids on treatment with acetyl bromide and hydrogen bromide generated in situ from acetyl bromide and propan-2-ol.
J. Libman and Y. Mazur, J. Chem. Soc. D, 1971, 730 DOI: 10.1039/C29710000730
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