The invention provides a method for the preparation of enantiomerically pure mirtazapine, said method comprising a step of ring closure of a compound of formula (II) wherein X is a leaving group, said step comprising treatment with an acid, whereby mirlazapine with enantiomeric excess is formed by the ring closure of the compound of formula (II) with enantiomeric excess by treatment with a suitable acid in the absence of a solvent or a suitable combination of an acid and an organic solvent.
本发明提供了一种制备对映纯的
米氮平的方法,该方法包括以下步骤:将公式(II)化合物中的X离去基进行环闭合处理,处理过程包括使用酸进行处理,通过在无溶剂或在酸和有机溶剂的适当组合下处理公式(II)化合物,从而形成对映纯的
米氮平。