Process for the preparation of a leukotriene antagonist and intermediates thereof
申请人:ESTEVE QUIMICA, S.A.
公开号:EP1783117A1
公开(公告)日:2007-05-09
It comprises a preparation process of Montelukast from an intermediate compound of formula (V), which is previously prepared by reaction of the corresponding sulfonate with 1-(mercaptomethyl)cyclopropyl)methanol. Compound (V) 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 intermediate compounds useful in such preparation process.