METHOD FOR PREPARING MONTELUKAST SODIUM SALTS

摘要

The present invention provides a method for preparing montelukast sodium salts of chemical formula 1 in the Description. The method of the present invention comprises the steps of: coupling the methanesulfonyl of chemical formula 2 and the compound of chemical formula 3 in the presence of bis(trimethylsilyl)amide alkali metal salts, adding an alkali metal base, and heating and hydrolyzing the resultant material to produce the compound of chemical formula 4; enabling a reaction between the compound of chemical formula 4 and 4-tert-butylcyclohexylamine and refining the resultant to produce the amine salts of chemical formula 5; and converting the amine salts into sodium salts.