申请人:Xu Jiankang
公开号:US20110098502A1
公开(公告)日:2011-04-28
The present invention relates to a process for resolving S-3-(Aminomethyl)-5-methylhexanoic acid, which adopts benzoyl-L-glutamic acid, 4-methyl benzoyl-L-glutamic acid, benzene sulfonyl-L-glutamic acid or 4-methyl benzene sulfonyl-L-glutamic acid as a resolution agent to make a first resolution to racemic 3-aminomethyl-5-methylhexanoic acid, and adopts the resolution agent same to that of the first resolution to make a second resolution to the first resolution product to obtain the second resolution product, thus the resolution salt product is obtained, and further hydrolyzed by an acid, the resolution agent is extracted to be separated, the pH is adjusted to be neutral, the product S-3-(Aminomethyl)-5-methylhexanoic acid, i.e. the pregabalin, is then precipitated by distillation, therefore the present invention has the characteristics of polluting the environment slightly, high efficiency and stability, simpleness and practicality, producing product with high purity and a low sproduction cost, and is suitable for large-scale production.
本发明涉及一种用苯甲酰-L-谷氨酸、4-甲基苯甲酰-L-谷氨酸、苯磺酰-L-谷氨酸或4-甲基苯磺酰-L-谷氨酸作为分辨剂对拉氨酸的S-3-(氨甲基)-5-甲基己酸进行分辨的方法,对外消旋的3-氨甲基-5-甲基己酸进行第一次分辨,然后采用与第一次分辨相同的分辨剂对第一次分辨产物进行第二次分辨,得到第二次分辨产物,从而得到分辨盐产物,进一步通过酸水解,提取分辨剂进行分离,将pH值调节至中性,然后通过蒸馏使得S-3-(氨甲基)-5-甲基己酸即盐酸普瑞巴林沉淀,因此本发明具有污染环境轻微、高效稳定、简单实用、生产纯度高、生产成本低等特点,适用于大规模生产。