Highly efficient methods for synthesis of levomethadone hydrochloride or dextromethadone hydrochloride are provided starting from D-alanine, or L-alanine, respectively, with retention of configuration. Methods for treating a subject are provided comprising administering a composition comprising an effective amount of levomethadone hydrochloride having not more than 10 ppm dextromethadone.
提供了高效的方法,从
D-丙氨酸或
L-丙氨酸开始合成左
甲烷麻黄定盐酸盐或右
甲烷麻黄定盐酸盐,保持构型。提供了治疗主体的方法,包括给予含有效量左
甲烷麻黄定盐酸盐的组合物,其中右
甲烷麻黄定盐酸盐的含量不超过10 ppm。