Process for the preparation of pure stereoisomers of tetrahydrofolic acid esters salts and tetrahydrofolic acid by fractionated crystallization of tetrahydrofolic acid esters salts
申请人:Muller Hans Rudolf
公开号:US06858731B1
公开(公告)日:2005-02-22
A process for preparing and concentrating (6S,αS) or (6S,αR) tetrahydrofolic acid ester salts and (6S,αS) or (6S,αR) tetrahydrofolic acid, characterized by preparing or dissolving equimolar or concentrated mixtures of diastereomers of addition salts of tetrahydrofolic acid esters with aromatic sulphonic acids in organic solvents, followed by crystallizing them at least once, and then if applicable hydrolyzing the crystallizate to produce (6S,αS) or (6S,αR) tetrahydrofolic acid, crystallizing the latter as a free acid or isolating it in the form of a salt.
一种制备和浓缩(6S,αS)或(6S,αR)四氢叶酸酯盐和(6S,αS)或(6S,αR)四氢叶酸的过程,其特征在于,在有机溶剂中制备或溶解四氢叶酸酯的异构体加成盐与芳香磺酸的等摩尔或浓缩混合物,然后至少结晶一次,然后如适用,水解结晶物以产生(6S,αS)或(6S,αR)四氢叶酸,将后者结晶为自由酸或以盐的形式分离。