The present invention relates to a method for the preparation of mirtazapine and tetracyclic analogous compounds having substantial enantiomeric excess of the R or S form. The invention further relates to a novel intermediate and its use for the preparation of mirtazapine having a substantial enantiomeric excess of the R or S form. The method comprising the steps of a: providing a carboxylic acid compound according to Formula I having a substantial enantiomeric excess of the R or S form, b: converting the carboxylic acid group of compound I into a ketone group, producing a ketone compound of Formula II, c: optionally reducing ketone compound II with a mild reduction agent to form the intermediate hydroxy compound of Formula III and d: forming the mirtazapine of Formula IV by reduction of the ketone compound II or of the hydroxy compound III using a strong reduction agent.
本发明涉及一种制备
米氮平和具有R或S形式的显着对映体过量的四环类似化合物的方法。该发明进一步涉及一种新颖的中间体及其用于制备
米氮平具有R或S形式显着对映体过量的用途。该方法包括以下步骤:a:提供符合式I的
羧酸化合物,其具有显着的R或S形式对映体过量,b:将化合物I的羧基转化为酮基,生成符合式II的酮化合物,c:可选择地使用温和还原剂还原酮化合物II,形成符合式III的中间羟基化合物,d:通过使用强还原剂还原酮化合物II或羟基化合物III来形成符合式IV的
米氮平。