Process for the preparation of pure allylamine pharmaceutical terbinafine of formula I
in free base form or acid addition salt form, by distilling crude terbinafine base, preferably by short path distillation, e.g. at a temperature above 100° C. and reduced pressure, e.g. 0.2 mbar, and recovering the purified product in free base or acid addition salt form.
The process is indicated for use in removal of metal or non-metal contaminants, optionally together with salt formation under simultaneous precipitation of pure trans isomer.
Detection of non-metal contaminants such as substance A of formula
preferably is effected by RP HPLC analysis with UV detection.
制备纯
烯丙胺药物特比那
菲(
化学式I)的过程,可得到其自由碱基形式或酸盐加成盐形式,方法是通过蒸馏粗特比那
菲碱基,最好采用短程蒸馏,例如在100℃以上和减压条件下(例如0.2毫巴),并以自由碱基或酸盐加成盐形式回收纯化后的产品。该过程适用于去除
金属或非
金属杂质,可选择与盐形成同时沉淀纯的顺式异构体。检测非
金属杂质,例如化合物A的公式,最好采用RP HPLC分析与紫外线检测。