Stereospecific methods for the preparation of 5α,6α- and 5β,6β-epoxyandrostane-4,17-dione are described. A Favorskii-type ring contraction of the 5β,6β-epoxide affords a rapid route to A-nor-steroids.
J. R. Hanson, D. Raines and H. Wadsworth, J. Chem. Soc., Perkin Trans. 1, 1978, 743 DOI: 10.1039/P19780000743
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