A process for preparation of montelukast or a salt thereof is provided, the process including reacting a late intermediate compound which is 2-[1-[1-R-3-[2-(7 chloro quinolin-2-yl) vinyl [phenyl]-3-[2-methoxy carbonyl phenyl] propyl sulfonyl methyl] cyclo propyl] acetic acid or a salt thereof with methyl magnesium chloride or methyl magnesium bromide in an organic solvent. In one embodiment, the process includes reacting an earlier intermediate compound which is methyl 2-(3-R-(3-(2-(7-chloro 2-quinolinyl)-ethenyl)-3 hydroxy propyl) benzoate with methane sulfonyl chloride or toluene sulfonyl chloride to obtain a mesylated or tosylated derivative of the earlier intermediate compound; followed by a reaction of the mesylated or tosylated derivative with 1-mercapto methyl cyclopropane acetic acid in a polar solvent in a presence of a base to obtain the late intermediate compound.
提供一种用于制备蒙特鲁卡斯特或其盐的过程,该过程包括在有机溶剂中将2-[1-[1-R-3-[2-(7
氯喹啉-2-基)
乙烯[苯基]-3-[2-甲氧羰基苯基]丙磺酰甲基]环丙基]
醋酸或其盐与甲基
镁氯化物或
溴化物反应。在一个实施例中,该过程包括将较早的中间体化合物(甲基2-(3-R-(3-(2-(
7-氯喹啉基)-
乙烯基)-3-羟基丙基)
苯甲酸酯)与甲
磺酰氯或甲
苯磺酰氯反应,以获得较早中间体化合物的甲磺酰化或
甲苯磺酰化衍
生物;然后将甲磺酰化或
甲苯磺酰化衍
生物与1-巯基甲基
环丙基乙酸在极性溶剂中在碱的存在下反应,以获得晚期中间体化合物。