The synthesis of 21-acetoxy-17α-hydroxy-16β-methylpregna-1,4,9(11)-triene from 9α-hydroxyandrost-4-ene-3,17-dione via a 17-cyanohydrin and a 17-oxazoline is described.
N. I. Carruthers, D. R. Andrews, S. Garshasb and R. A. Giusto, J. Chem. Soc., Perkin Trans. 1, 1992, 1195 DOI: 10.1039/P19920001195
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