It relates to a process for the purification of Montelukast, or pharmaceutically salts thereof, or solvates thereof, including stereoisomers or mixture thereof which comprises carrying out a specific set of selective solvent extractions of Montelukast or its impurities in a mixture of an organic solvent and water at specific ranges of pH and temperature which depend on the type of impurities to remove. In particular, it comprises at least one wash of an aqueous phase containing crude Montelukast in salt form with an organic solvent, at a pH comprised between 12.0 and 13.5; and optionally one or more washes of the resulting aqueous phase with an organic solvent at a pH comprised between 8.5 and 10.0. Montelukast is recovered by acidification at a pH comprised between 4.5 and 8.0 and solvent extraction, and is isolated either as acid or in salt form.
本发明涉及一种蒙特卢卡斯特的纯化过程,或其药物盐或溶剂化物,包括立体异构体或其混合物的纯化,其中包括在有机溶剂和
水的混合物中,在特定的pH和温度范围内进行蒙特卢卡斯特或其杂质的选择性溶剂萃取的特定集合。特别地,它包括至少一次在pH在12.0至13.5之间的含有粗蒙特卢卡斯特盐形态的
水相中,用有机溶剂进行洗涤;并且可选择地,在pH在8.5至10.0之间的结果
水相中,用有机溶剂进行一次或多次洗涤。蒙特卢卡斯特通过在pH在4.5至8.0之
间酸化和溶剂萃取来回收,并且以酸形式或盐形式进行分离。