Process for the preparation of 24,24-difluoro-1.alpha.,25-dihydr

Details Process for the preparation of 24,24-difluoro-1.alpha.,25-dihydr Process for the preparation of 24,24-difluoro-1.alpha.,25-dihydr

1982-05-17

1983-12-20

Roberts, Elbert L.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

2603972, 2603974, C07J 900

Patent

active

044216904

ABSTRACT:
The present invention relates to a process and intermediates for the preparation of 24,24-difluoro-1.alpha.,25-dihydroxycholecalciferol from the readily-available 1.alpha.,3.beta.-dihydroxyandrost-5-en-17-one which is made by a known microbiological process from 3.beta.-hydroxyandrost-5-en-17-one [R. M. Dodson, A. H. Goldkamp and R. D. Muir, J. Amer. Chem. Soc. 82 4026 (1960)].

REFERENCES:
patent: 4284577 (1981-08-01), Yamada et al.

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