Methods for preparation and use of 1.alpha., 24(S) -dihydroxy vitamin D2
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United States of America Patent
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Nov 7, 2000
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app pub date -
Dec 14, 1998
filing date -
Aug 28, 1992
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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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