Process for preparing n-alkyl ammonium acetonitrile compounds

Details Process for preparing n-alkyl ammonium acetonitrile compounds Process for preparing n-alkyl ammonium acetonitrile compounds

C - Chemistry, Metallurgy

07

D

C07D 265/12 (2006.01) C07D 211/26 (2006.01) C07D 211/34 (2006.01) C07D 295/12 (2006.01) C07D 295/14 (2006.01) C07D 295/15 (2006.01) C11D 3/39 (2006.01)

Patent

CA 2273087

A process for the preparation of a compound having the structure of Formula (I) wherein A, R1, R2, R3, Y and Z are as defined in the disclosure. The process includes reacting a heterocyclic amine with a monoaldehyde or a dialdehyde in a pH range of from about 8 to 14 and then quaternizing the so- reacted heterocyclic amine with an alkylating agent at a pH of not less than about 2. The use of a pH control substantially prevents formation of an undesirable protonated intermediate.

Cette invention concerne un procédé de préparation d'un composé dont la structure correspond à la formule (I) où A, R¿1?, R¿2?, R¿3?, Y et Z sont tels que définis dans la description. Ce procédé consiste à faire réagir une amine hétérocyclique avec un monaldéhyde ou un dialdéhyde dans un pH allant environ de 8 à 14. Après réaction de l'amine hétérocyclique, on procède à sa quaternisation à l'aide d'un agent d'alcoylation à un pH au moins égal à 2. Le réglage du pH permet d'éviter dans une grande mesure la formation d'un produit intermédiaire protoné et indésirable.

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