1100021-00-8Relevant articles and documents
METHOD FOR ISOLATION AND PURIFICATION OF MONTELUKAST
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Page/Page column 7, (2010/11/03)
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.