Methods for preparation and use of 1.alpha.,24(S)-dihydroxy vita

Drug – bio-affecting and body treating compositions – Designated organic active ingredient containing – 9,10-seco- cyclopentanohydrophenanthrene ring system doai

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A61K 3159

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057863482

ABSTRACT:
1.alpha.,24(S)-Dihydroxy vitamin D.sub.2 which is useful as an active compound of pharmaceutical compositions for the treatment of disorders of calcium metabolism and for various skin disorders. The invention also includes preparation of synthetic 1.alpha.,24(S)-dihydroxy vitamin D.sub.2 starting from ergosterol which is converted in six steps to 24-hydroxyergosterol. 24-Hydroxyergosterol is irradiated and thermally converted to 24-hydroxy vitamin D.sub.2 which is converted in six steps to 1.alpha.,24(S)-dihydroxy vitamin D.sub.2. The syntheses also produced novel intermediates.

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