The present invention is directed to an improved process for the preparation of methylphenidate, stereoisomer, mixture of stereoisomers and pharmaceutically acceptable salts thereof, more particularly, the sulfate and hydrochloride salts of methylphenidate, di-threo-methylphenidate and dexmethylphenidate. Methods of removing or reducing the amount of impurities from the above described process are also disclosed.
本发明涉及一种改进的甲基苯
丙胺、立体异构体、立体异构体混合物及其药学上可接受的盐的制备方法,更具体地说,是甲基苯
丙胺、二-反-甲基苯
丙胺和右旋甲基苯
丙胺的
硫酸盐和盐酸盐的制备方法。本发明还揭示了从上述过程中去除或减少杂质的方法。