[EN] METHOD FOR THE PREPARATION OF MONTELUKAST ACID IN IONIC LIQUID MEDIUM<br/>[FR] PROCÉDÉ DE FABRICATION D'ACIDE MONTÉLUKAST DANS UN MILIEU LIQUIDE IONIQUE
申请人:HANMI PHARM IND CO LTD
公开号:WO2009048236A1
公开(公告)日:2009-04-16
The present invention relates to a method for preparing Montelukast acid or its sodium salt by reacting a thiol compound with a Montelukast intermediate in the presence of a base in a medium comprising an ionic liquid compound. In accordance with the inventive method, highly pure Montelukast acid or its sodium salt, which is advantageously used as a raw material in the preparation of Montelukast, a leukotriene antagonist, can be easily prepared in a high yield.