C-21 chlorination of 20-oxosteroids using the system MnO2 (excess)–TMSCl or MnO2 (excess)–AcCl in acetic acid medium as well as an example of a Wagner–Meerwein rearrangement of 17α-chloro-20-oxopregna-3β-yl acetate to 17-β-methyl-18-nor-17α-pregn-13-en-3β-yl acetate have been demonstrated.
P. Borah, M. Ahmed and P. Chowdhury, J. Chem. Res. (S), 1998, 236 DOI: 10.1039/A701350G
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