The invention relates to a process for the diastereoisomeric resolution of 5-methyltetrahydrofolic acid; it discloses also a crystalline amine salt of 5-methyltetrahydrofolic acid and is further directed to a process for the transformation of the single diastereoisomers of the 5-methyltetrahydrofolic amine salts obtained by the process of the invention into the corresponding free acid or into an alkaline earth metal salt. The invention provides a simple, economically advantageous and efficient process and allows to obtain stable and pure (6R) and ( 6S) -diastereoisomers of 5-methyltetrahydrofolic acid in a good yield and diastereoisomeric purity.
本发明涉及一种对
5-甲基四氢叶酸进行对映异构体分离的方法;还揭示了
5-甲基四氢叶酸的晶态胺盐,并进一步针对本发明所得的
5-甲基四氢叶酸胺盐的单一对映异构体进行转化成相应的
游离酸或碱土
金属盐的方法。本发明提供了一种简单、经济优势和高效的方法,并允许以良好的产率和对映异构体纯度获得稳定和纯净的(6R)和(6S)-
5-甲基四氢叶酸对映异构体。