Process for the preparation of ketimines

Details Process for the preparation of ketimines Process for the preparation of ketimines

C - Chemistry, Metallurgy

07

C

C07C 249/02 (2006.01) C07C 251/20 (2006.01)

Patent

CA 2388816

The present invention relates to a process for the preparation of compounds of formula (1), in which R1, R2 and R3 independently of one another are hydrogen, halogen, trifluoromethyl or C1-C4alkoxy, wherein a compound of formula (2), in which R1, R2 and R3 are as defined in formula (1), is reacted with methylamine in the presence of a non-alcoholic solvent and, if desired, in the presence of a sulfonic acid catalyst to give the compound of formula (2) and, if desired, is subjected to purification by recrystallization.

La présente invention porte sur un procédé de préparation de composés de la formule (1), dans laquelle R¿1?, R¿2? et R¿3? représentent, indépendamment, hydrogène, halogène, trifluorométhyle ou C¿1?-C¿4?alcoxy. Selon cette invention, un composé de la formule (2), dans laquelle R¿1?, R¿2? et R¿3? sont tels que définis dans la formule (1), est mis à réagir avec méthylamine en présence d'un solvant sans alcool et, si souhaité, en présence d'un catalyseur d'acide sulfonique afin d'obtenir le composé de la formule (2) et, si souhaité, est soumis à un processus de purification par recristallisation.

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