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.
这涉及一种用于纯化蒙特鲁卡斯特或其药用盐或溶剂结晶体的过程,包括立体异构体或其混合物,其包括在特定范围的pH和温度下,在有机溶剂和
水的混合物中进行特定的选择性溶剂萃取蒙特鲁卡斯特或其杂质的一套步骤,这取决于要去除的杂质类型。具体而言,它包括至少用一个有机溶剂对含有盐形式的粗蒙特鲁卡斯特的
水相进行洗涤,其pH值介于12.0和13.5之间;并且可选地,用一个或多个有机溶剂对结果
水相进行洗涤,其pH值介于8.5和10.0之间。蒙特鲁卡斯特通过在pH值介于4.5和8.0之间的酸化和溶剂萃取中回收,并以酸或盐形式隔离。