Potassium tri(R,S-s-butyl)borohydride reduces 3-oxo-steroids of the 5α- and 5β-series to the axial alcohol under conditions in which the 17-and 20-ketone groups remain unaffected.
G. Göndös and J. C. Orr, J. Chem. Soc., Chem. Commun., 1982, 1239 DOI: 10.1039/C39820001239
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