摘要:
Disclosed are methods of purifying (20R) and (20S) analogs of 2-methylene-19- nor-22-dimethyl-1α,25-dihydroxyvitamin D 3 to obtain the (20R) and (20S) analogs in crystalline form. The method includes the steps of preparing a solvent of either diethyl ether or a mixture of 2-propanol and hexane, dissolving a product containing the (20R) and (20S) analog 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 crystals, and recovering the crystals.
摘要:
Disclosed are methods of purifying the compound (20R)-19-nor-24- difluoro-1α,25-dihydroxyvitamin D 3 to obtain the compound in crystalline form. The methods typically include the steps of dissolving a product containing the compound in a solvent comprising hexane and 2-propanol, cooling the solvent and dissolved product below ambient temperature for a sufficient amount of time to form a precipitate of crystals, and recovering the crystals.
摘要:
Disclosed are methods of purifying the compound (20R>2-methylene-19-nor-24- difluoro-1α,25-dihydroxy vitamin D3 to obtain the compound in crystalline form. The methods typically include the steps of dissolving a product containing the compound in a solvent comprising hexane and 2-propanol, cooling the solvent and dissolved product below ambient temperature for a sufficient amount of time to form a precipitate of crystals, and recovering the crystals. Formula (I).