| 摘要 |
The invention provides new 24, 26, and/or 27 homologated vitamin D2 compounds, such as 26,27-dihomo-1 alpha -hydroxyvitamin D2, 26,27-dihomo-1 alpha -hydroxy-24-epivitamin D2, 26,27-dihomo-1 alpha ,25-dihydroxy-24-epi-vitamin D2 and certain hydroxy-protected derivatives thereof. The new epi compounds in particular exhibit a distinctive activity pattern comprising high potency in stimulating intestinal calcium transport and little or no activity in inducing bone calcium mobilization or the differentiation of undifferentiated cells in culture, thereby evincing utility in the treatment of diseases characterized by loss of bone mass. In contrast, the natural form exhibits no activity in either mobilizing calcium from bone or stimulating intestinal calcium transport. A process for preparing such compounds is also disclosed.
|
