Novel methods and systems for producing a substantially pure d-threo stereoisomer of methylphenidate or a salt thereof are provided. In particular, methods and systems for producing d-threo-methylphenidate hydrochloride in pure stereoisomeric form from d-threo-ritalinic acid hydrochloride using diazomethane are described. The described methods can be performed on a large scale, and thus provide d-threo methylphenidate or a salt thereof, and particularly the hydrochloride salt of d-threo-methylphenidate, in stereoisomerically pure form and in large quantities from a single batch reaction. Also described are novel compositions of d-threo methylphenidate hydrochloride.
提供了生产甲基苯
丙胺的D-顺式异构体或其盐的纯度较高的新方法和系统。具体而言,描述了使用
重氮甲烷从D-顺式利他酸盐酸盐制备纯顺式异构体的D-顺式甲基苯
丙胺盐酸盐的方法和系统。所述方法可以在大规模上进行,因此可以从单个批次反应中提供D-顺式甲基苯
丙胺或其盐,特别是D-顺式甲基苯
丙胺的盐酸盐,在立体异构纯度和大量方面。还描述了D-顺式甲基苯
丙胺盐酸盐的新组合物。