A method of isolation of Montelukast of formula I from reaction mixtures, comprising conversion of the crude sub-stance to well-crystallizing salts with primary amines in the environment of at least one organic solvent and acetonitrile, followed by re-crystallization of these salts with simultaneous removal of chemical impurities and use of the chemically pure salts of Montelukast with primary amines for direct transformation to the pharmaceutically useful amorphous form of Montelukast sodium of formula II.
一种从反应混合物中分离Montelukast I式化合物的方法,包括将粗品转化为与初级胺形成良好结晶的盐,其中环境包括至少一种有机溶剂和
乙腈,随后再结晶这些盐,并同时去除
化学杂质,使用与初级胺形成的
化学纯的Montelukast盐直接转化为Montelukast II式
钠的药用非晶态形式。