Process for the preparation of 21-halogeno-21-desoxy-17.alpha.-a

Details Process for the preparation of 21-halogeno-21-desoxy-17.alpha.-a Process for the preparation of 21-halogeno-21-desoxy-17.alpha.-a

1975-08-14

1976-11-16

Roberts, Elbert L.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

26023955D, C07J 500

Patent

active

039924220

ABSTRACT:
21-Halogeno-17.alpha.-acyloxy-20-keto-4-pregnenes having physiological properties are prepared by the reaction of a 17.alpha.,21-dihydroxy-20-keto-4-pregnene 17.alpha.,21-orthoester with a halide reagent selected from the group consisting of triarylsilyl halides and tri-lower alkylsilyl halides in an organic solvent, said halide being chloride or bromide. Preferred reagents are tri-lower alkylsilyl halides, particularly trimethylsilyl chloride.

REFERENCES:
patent: 3743636 (1973-07-01), Hartmann et al.
patent: 3755302 (1973-08-01), Ercoli et al.
patent: 3832366 (1974-08-01), Cimarusti

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