The present invention provides a method for preparing a novel class of vitamin D compounds in which the C-25 or equivalent position has a double bond. In addition, the side chain is optionally extended by one or two methylene or methyne groups. The compounds prepared by the method of the present invention are of value as prodrugs for active 1&agr;, 24-dihydroxylated vitamin D compounds.
本发明提供了一种新型
维生素 D 类化合物的制备方法,该化合物的 C-25 或同等位置具有双键。此外,侧链可选择由一个或两个亚甲基或甲基基团延伸。本发明方法制备的化合物具有作为活性 1&agr;,24-二羟基
维生素 D 化合物原药的价值。