A 1.alpha.-hydroxy vitamin D.sub.3 derivative of the formula: ##STR1## where R.sub.1 is a hydroxyl group, an amino group or the group: OR' (where R' is a lower alkyl group having 1 to 7 carbon atoms that may or may not be substituted by a hydroxyl group, a halogen atom, a cyano group, a lower alkoxy group having 1 to 3 carbon atoms, an amino group, or an acylamino group); R.sub.2 is a hydrogen atom or a hydroxyl group), and a process for preparing the same are disclosed. The compound represented by the formula above has the calcium control action and the ability to induce differentiation in tumor cells and, therefore, are useful as an antitumor agents and a medicine for treating calcium dysbolism-caused diseases.
公开了一种公式为:##STR1##的1.alpha.-羟基
维生素D.sub.3衍
生物,其中R.sub.1是羟基基团,
氨基基团或基团:OR'(其中R'是具有1至7个碳原子的较低烷基基团,可能或可能没有被羟基基团,卤素原子,
氰基,具有1至3个碳原子的较低烷氧基团,
氨基基团或酰胺基团取代); R.sub.2是氢原子或羟基基团。公式上述代表的化合物具有
钙控制作用和诱导肿瘤细胞分化的能力,因此可用作抗肿瘤剂和治疗
钙代谢紊乱引起的疾病的药物。制备方法也被公开。