Hector F. DeLuca,Agnieszka Glebocka,James B. Thoden,Hazel M. Holden
申请号：
US13588608
公开号：
US08519169B2
申请日:
2012.08.17
申请国别(地区):
US
年份:
2013
代理人:
摘要：
A method of purifying 1α-hydroxy-20-methyl-2-methylene-19,24,25,26,27-pentanorvitamin D3 to obtain 1α-hydroxy-20-methyl-2-methylene-19,24,25,26,27-pentanorvitamin D3 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 D3 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 D3 crystals, and recovering the 1α-hydroxy-20-methyl-2-methylene-19,24,25,26,27-pentanorvitamin D3 crystals.
