Vitamin D₂ analogs in which a cyclopropane ring is introduced onto the 24-carbon of the side chain of 1α,25-dihydroxyvitamin D₂ and 1α-hydroxyvitamin D₂. The compounds are characterized by a marked intestinal calcium transport activity while exhibiting much lower activity than 1α,25-dihydroxy-vitamin D₃ in their ability to mobilize calcium from bone. Because of their preferential calcemic activity, these compounds would be useful for the treatment of diseases where bone formation is desired, such as osteoporosis.
在 1α,25-二羟
维生素 D₂ 和 1α- 羟
维生素 D₂ 侧链的 24 碳上引入
环丙烷环的
维生素 D₂ 类似物。这些化合物的特点是具有明显的肠道
钙转运活性,而从骨骼中动员
钙的活性却远低于 1α,25-二羟基
维生素 D₃。由于这些化合物具有优先的降
钙活性,因此可用于治疗希望形成骨质的疾病,如骨质疏松症。