Method of manufacturing sertindole

C - Chemistry – Metallurgy – 07 – D

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C07D 401/14 (2006.01) C07C 227/08 (2006.01) C07C 227/18 (2006.01) C07C 229/20 (2006.01) C07D 401/04 (2006.01) C07C 229/58 (2006.01)

Patent

CA 2288334

A process of manufacturing sertindole comprising preparation of N-(4- fluorophenyl)-N-(2-carboxy-4-chlorophenyl)glycine, by reacting an alkalimetal salt of 2,5-dichlorobenzoic acid with an alkalimetal salt of N-(4-fluorophenyl)glycine in an aqueous, alkaline environment in the presence of a copper catalyst; cyclisation of N-(4- fluorophenyl)-N-(2-carboxy-4-chlorophenyl)glycine to the corresponding 3-acetoxy-indole; reduction of the 3-acetoxy-indole and subsequent elimination of H2O thereby obtaining 5-chloro-1-(4-fluorophenyl)indole which is reacted with 4-piperidone in a mixture of an acetic acid and concentrated HCl; reduction of the resulting 5-chloro-1-(4-fluorophenyl)-3- (1,2,3,6-tetrahydropyridin-4-yl)indole and reaction of this compound with 1-(2-chloroethyl)-2-imidazolidinon in order to obtain sertindole. Alternatively, 5-chloro-1-(4-fluorophenyl)-3-(1,2,3,6-tetrahydropyridin-4-yl)indole is first reacted with 1-(2-chloroethyl)-2-imidazolidinon followed by reduction thereby obtaining sertindole. This process uses reactants and solvents that are suitable and allowed in large scale manufacture. Furthermore good total yields are obtained.

Selon un procédé permettant de fabriquer du sertindole, on prépare la N-(4-fluorophényl)-N-(2-carboxy-4-chlorophényl)glycine en faisant réagir un sel d'un métal alcalin de l'acide 2,5-dichlorobenzoïque avec un sel d'un métal alcalin de la N-(4-fluorophényl)glycine dans un environnement alcalin aqueux, en présence d'un catalyseur à base de cuivre; on cyclise la N-(4-fluorophényl)-N-(2-carboxy-4-chlorophényl)glycine de façon à obtenir le 3-acétoxy-indole correspondant; on réduit le 3-acétoxy-indole et on élimine H2O, de façon à obtenir le 5-chloro-1-(4-fluorophényl)indole, que l'on fait réagir avec la 4-pipéridone dans un mélange d'acide acétique et de HCl concentré; on réduit le 5-chloro-1-(4-fluorophényl)-3-(1,2,3,6-tétrahydropyridine-4-yl)indole obtenu et on fait réagir ce composé avec la 1-(2-chloro-éthyl)-2-imidazolidinone afin d'obtenir le sertindole. On peut aussi faire réagir d'abord le 5-chloro-1-(4-fluorophényl)-3-(1,2,3,6-tétrahydropyridine-4-yl)indole avec la 1-(2-chloro-éthyl)-2-imidazolidinone, puis réduire, de façon à obtenir le sertindole. Ce procédé utilise des réactifs et des solvants adaptés et autorisés pour une fabrication à grande échelle, et permet d'obtenir des rendements élevés.

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