Method for preparing 17.alpha.-ester 21-halo pregnanes

Details Method for preparing 17.alpha.-ester 21-halo pregnanes Method for preparing 17.alpha.-ester 21-halo pregnanes

C - Chemistry, Metallurgy

07

J

260/80

C07J 7/00 (2006.01) C07J 71/00 (2006.01)

Patent

CA 1044225

Abstract of the Disclosure A method for preparing 17.alpha.-ester-21-halo pregnanes, which com- prises reacting 17.alpha.,21-cyclic orthoesters of 17.alpha.,21-dihydroxy pregnanes with a halo compound in the presence of an organic polar solvent, enables the simultaneous halogenation at 21 position and esterification at 17.alpha.-position of said 17.alpha.,21-cyclic orthoesters to proceed at one step in a short time without any unfavorable side-reactions.

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