反应详情

EP 480717 discloses a process for preparing montelukast sodium by reacting 2-(2-(2-(3(S)-(3-(2-(7-chloro-2-quinolinyl)-ethenyl)phenyl)-3-(methanesulfonyloxy)propyl)phenyl)-2-propoxy)tetra hydro pyran with Methyl 1-(acetylthiomethyl)cyclopropane acetate in presence of hydrazine, cesium carbonate in acetonitrile as solvent to get methyl ester of Montelukast in pyran protected form, which is further reacted with pyridinium p-toluene sulfonate, sodium hydroxide in a mixture of methanol and tetrahydrofuran as a solvent to afford Montelukast sodium of Formula (I).