At variance with previous reports, palladium-catalysed reduction of 9α-fluorohydrocortisone 21-acetate (1a) and 1,2-didehydro-9α-fluoro-16α-methylhydrocortisone 21-acetate (2a) yields the 5β-configuration.
E. L. Shapiro, M. J. Gentles, A. T. McPhail and K. D. Onan, J. Chem. Soc., Chem. Commun., 1976, 961 DOI: 10.1039/C39760000961
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