Dicyclohexylamine salt of formula (IIa) or a pharmaceutically acceptable solvate thereof, including a hydrate, and its process for preparation. Process for the preparation of montelukast of formula (I) or a pharmaceutically acceptable salt thereof, or a pharmaceutically acceptable solvate thereof, including a hydrate, comprising the conversion of a salt of formula (IIa) into its form of free acid, followed by reaction with a compound of formula (III) CH3MgX, wherein X is halogen, in a suitable solvent, optionally in the presence of a Lewis acid.
公式(IIa)的
二环己胺盐或其药用可接受的溶剂结晶体,包括
水合物,以及其制备方法。一种制备公式(I)的蒙特卢卡斯特或其药用可接受的盐,或其药用可接受的溶剂结晶体,包括
水合物的方法,包括将公式(IIa)的盐转化为其
游离酸形式,然后与公式(III)CH3MgX的化合物反应,其中X为卤素,在合适的溶剂中,可选地在Lewis酸的存在下进行。