Methods of preparing a fenfluramine active pharmaceutical ingredient are provided. Aspects of the method include (a) hydrolyzing a 2-(3-(trifluoromethyl)phenyl)acetonitrile composition to produce a 2-(3-(trifluoromethyl)phenyl)acetic acid composition; (b) reacting the 2-(3-(trifluoromethyl)phenyl)acetic acid composition with acetic anhydride and a catalyst to produce a 1-(3-(trifluoromethyl)phenyl)propan-2-one composition; and (c) reductively aminating the 1-(3-(trifluoromethyl)phenyl)propan-2-one composition with ethylamine using a borohydride reducing agent to produce a fenfluramine composition. Also provided are compositions and pharmaceutical ingredients prepared according to the subject methods including a pharmaceutically acceptable salt of fenfluramine and having less than 0.2% by weight in total of trifluoromethyl regioisomers.
提供了制备
芬氟拉明活性药物成分的方法。该方法的各个方面包括:(a) 将 2-(3-(三
氟甲基)苯基)
乙腈组合物
水解,生成 2-(3-(三
氟甲基)苯基)
乙酸组合物;(b) 将 2-(3-(三
氟甲基)苯基)
乙酸组合物与
乙酸酐和催化剂反应,生成 1-(3-(三
氟甲基)苯基)丙-2-酮组合物;(c) 使用
硼氢化还原剂将 1-(3-(三
氟甲基)苯基)丙-2-酮组合物与
乙胺还原胺化,生成
芬氟拉明组合物。还提供了根据所述主题方法制备的组合物和药物成分,包括
芬氟拉明的药学上可接受的盐,其三
氟甲基雷公藤异构体的总重量小于 0.2%。