1.alpha.,24(s)-dihydroxy vitamin d2, its formation and use

Details 1.alpha.,24(s)-dihydroxy vitamin d2, its formation and use 1.alpha.,24(s)-dihydroxy vitamin d2, its formation and use

C - Chemistry, Metallurgy

07

C

C07C 401/00 (2006.01) A23K 1/165 (2006.01) A61K 31/59 (2006.01) C07J 9/00 (2006.01) C07J 71/00 (2006.01)

Patent

CA 2121689

1.alpha.,24(S)-Dihydroxy vitamin D2 which is useful as an active compound of pharmaceutical compositions for the treat-ment of disorders of calcium metabolism and for various skin disorders. The invention also includes preparation of sym-thetic 1.alpha.,24(S)-dihydroxy vitamin D2 starting from ergosterol which is converted in six steps to 24-hydroxyergosterol. 24-Hy-droxyergosterol is irradiated and thermally converted to 24-hydroxy vitamin D2 which is converted in six steps to 1.alpha.,24(S)-dihydroxy vitamin D2. The syntheses also produce novel intermediates.

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