20(S)-25-hydroxy vitamin D compounds

Details 20(S)-25-hydroxy vitamin D compounds 20(S)-25-hydroxy vitamin D compounds

1997-01-14

1998-11-24

Clardy, S. Mark

Organic compounds -- part of the class 532-570 series

Organic compounds

9,10-seco-cyclopentanohydrophenanthrene ring system or...

C07C40100

Patent

active

058409386

ABSTRACT:
Vitamin D.sub.3 analogs in which the methyl group normally attached to the side chain at carbon 20 has been exchanged with the hydrogen atom to form the 20-epi configuration. The compounds are characterized by a marked intestinal calcium transport activity while exhibiting much higher activity than 1.alpha.,25-dihydroxyvitamin D.sub.3 in their ability to mobilize calcium from bone. Because of their preferential calemic activity, these compounds would be useful for the treatment of diseases such as hypoparathyroidism or where bone formation is desired, such as low bone turn over osteoporosis. This disclosure is also directed toward 20-epi-3,5-cyclovitamin D compounds useful as intermediates in a process for preparing 20-epi-vitamin D.sub.3 analogs.

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