The 6α-acetoxy-, 6β-acetoxy-, and 6-oxo-5α-hydroxy-4,4-dimethyl-steroids (9), (10), and (11) undergo Westphalen-type rearrangement to give the corresponding 5β-methyl-Δ9-compounds. The 6-deoxy-5α-hydroxy-4,4-dimethyl-compound (12) gives the Δ5-compound.
J. G. Ll. Jones and B. A. Marples, J. Chem. Soc. C, 1970, 2273 DOI: 10.1039/J39700002273
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