(20R,25S)-2-Methylene-19,26-Dinor-1alpha,25-Dihydroxyvitamin D3 in Crystalline Form
申请人:DeLuca Hector F.
公开号:US20120083614A1
公开(公告)日:2012-04-05
A method of purifying (20R,25S)-2-methylene-19,26-dinor-1α,25-dihydroxyvitamin D
3
to obtain (20R,25S)-2-methylene-19,26-dinor-1α,25-dihydroxyvitamin D
3
in crystalline form. The method includes the steps of preparing a solvent of methanol and water, dissolving a product containing (20R,25S)-2-methylene-19,26-dinor-1α,25-dihydroxyvitamin 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 (20R,25S)-2-methylene-19,26-dinor-1α,25-dihydroxyvitamin D
3
crystals, and recovering the (20R,25S)-2-methylene-19,26-dinor-1α,25-dihydroxyvitamin D
3
crystals.