It comprises a preparation process of Montelukast from a new intermediate compound of formula (VI), which is previously prepared by reaction of the corresponding sulfonate with 1-(mercaptomethyl)cyclopropyl)methanol. Compound (VI) is reacted with a Grignard reactant to convert the ester group into a tertiary alcohol, followed by conversion of the primary alcohol into a sulfonate, substitution of the sulfonate group by a cyano group, and finally transforming the cyano compound to the carboxilic acid compound by a hydrolysis reaction to afford Montelukast. Montelukast can also be prepared by a hydrolysis reaction of the corresponding amide. It also comprises new intermediate compounds useful in such preparation process.
本发明涉及一种从公式(VI)的新中间化合物制备蒙特卢卡斯特的制备过程,该中间化合物是通过将相应的
磺酸盐与1-(巯基甲基)
环丙基甲醇反应而预先制备的。化合物(VI)与
格氏试剂反应,将酯基转化为
三级醇,然后将一级醇转化为
磺酸盐,用
氰基取代
磺酸基,最后通过
水解反应将
氰基化合物转化为
羧酸化合物,从而得到蒙特卢卡斯特。蒙特卢卡斯特也可以通过相应酰胺的
水解反应制备。本发明还包括在这种制备过程中有用的新中间化合物。