Process for the preparation of leukotriene antagonists

C - Chemistry – Metallurgy – 07 – D

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C07D 215/18 (2006.01) C07C 323/53 (2006.01) C07D 215/14 (2006.01)

Patent

CA 2179407

The present invention relates to a process for the preparation of a compound of formula (I) or a sodium salt thereof, wherein HET is 7-chloroquinolin-2-yl or 6,7-difluoroquinolin-2-yl, which comprises: reacting the dilithium dianion of 1-(mercapto- methyl)cyclopropaneacetic acid with a compound of formula (II), wherein HET is as defined above and L is arylsulfonyl or alkylsulfonyl. The invention further provides the di- cyclohexylamine salt of a compound of formula (I), an intermediate falling within (II) and a 1- (Mercaptomethyl)cyclopropaneacetic acid intermediate.

La présente invention concerne un procédé de fabrication d'un composé conforme à la formule générale (I) ou l'un de ses sels de sodium. HET représente 7-chloroquinoline-2-yl ou 6,7-difluoroquinoline-2-yl. Ce procédé consiste à faire réagir du dilithium dianon d'acide 1-(mercapto-méthyl)cyclopanéacétique avec un composé conforme à la formule générale (II). HET est défini ci-dessus, et L représente arylsulfonyle ou alkylsulfonyle. L'invention concerne également le sel dicyclohexamine d'un composé conforme à la formule générale (II), un intermédiaire représenté par la formule (II) et un intermédiaire d'acide 1-(mercaptométhyl)cyclopanéacétique.

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