Synthesis of 12-fluoro-corticosteroids

Abstract
Methods for the preparation of various 11 (12)-enol derivatives of steroidal 9α-fluoro-11-ketones are described. The reaction of metal enolates with perchloryl fluorides provides a convenient route to α-fluoro-ketones. Factors permitting control of the direction of enolisation of steroidal 11-ketones are defined. The synthesis of 12α- and 12β-monofluoro- and 12,12-difluoro-9α-fluoro-corticoids is reported.

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