A method of purifying 1α-hydroxy-20-methyl-2-methylene-19,24,25,26,27-pentanorvitamin D
3
to obtain 1α-hydroxy-20-methyl-2-methylene-19,24,25,26,27-pentanorvitamin D
3
in crystalline form. The method includes the steps of preparing a solvent of either ethyl formate or a mixture of ethyl formate and hexane, dissolving a product containing 1α-hydroxy-20-methyl-2-methylene-19,24,25,26,27-pentanorvitamin D
3
to be purified in the solvent, cooling the solvent and dissolved product below ambient temperature for a sufficient amount of time to form a precipitate of 1α-hydroxy-20-methyl-2-methylene-19,24,25,26,27-pentanorvitamin D
3
crystals, and recovering the 1α-hydroxy-20-methyl-2-methylene-19,24,25,26,27-pentanorvitamin D
3
crystals.
一种纯化1α-羟基-20-甲基-2-亚甲基-19,24,25,26,27-五去甲
维生素D3的方法,以获得结晶形式的1α-羟基-20-甲基-2-亚甲基-19,24,25,26,27-五去甲
维生素D3。该方法包括以下步骤:制备
乙酸乙酯或
乙酸乙酯和己烷混合物的溶剂,将含有待纯化的1α-羟基-20-甲基-2-亚甲基-19,24,25,26,27-五去甲
维生素D3的产物溶解于该溶剂中,将溶剂和溶解的产物冷却至低于环境温度的足够时间,以形成1α-羟基-20-甲基-2-亚甲基-19,24,25,26,27-五去甲
维生素D3晶体的沉淀,并回收1α-羟基-20-甲基-2-亚甲基-19,24,25,26,27-五去甲
维生素D3晶体。