Treatment of oximes of 17-keto steroids with refluxing acetic anhydride and pyridine, and acid hydrolysis of the resulting enamides, constitutes an efficient route to 13-epi-17-keto-steroids; this observation is evidence that the former reaction proceeds by a freeradical pathway.
R. B. Boar, F. K. Jetuah, J. F. McGhie, M. S. Robinson and D. H. R. Barton, J. Chem. Soc., Chem. Commun., 1975, 748 DOI: 10.1039/C39750000748
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