24-Dehydrovitamin D3 derivatives, protected against metabolic conversions at the 25-position, of the formula
wherein R1 is a member selected from the group consisting of hydrogen and hydroxy; R2 is a member selected from the group consisting of hydrogen, hydroxy and fluoro, and wherein R, is not hydroxy when R2 is fluoro, their preparation, pharmaceutical compositions, methods of promoting intestinal calcium transport and treating rickets, osteomalacia, and osteoporosis, including steroid induced osteoporosis, senile osteoporosis and post-menopausal osteoporosis, intermediates and their preparation are dis- dosed,
24-脱氢
维生素 D3 衍
生物,防止在 25 位发生代谢转化,其式为 其中 R1 是选自由氢和羟基组成的组的成员;R2 是选自由氢、羟基和
氟组成的组的成员,其中当 R2 为
氟时,R, 不是羟基;其制备方法、药物组合物、促进肠道
钙转运和治疗佝偻病、骨软化症和骨质疏松症(包括类
固醇诱发的骨质疏松症、老年性骨质疏松症和绝经后骨质疏松症)的方法、中间体及其制备方法均已停药、