Process for the production of pyrazoles

Details Process for the production of pyrazoles Process for the production of pyrazoles

C - Chemistry, Metallurgy

07

D

C07D 231/14 (2006.01)

Patent

CA 2687176

A process for the production of a compound of formula (I), which comprises a) reacting a compound of formula (II), wherein R1 and R2 are both independently C1-C6 alkyl, with methylhydrazine in the presence of water and a water-immiscible organic solvent being inert in saponification reactions, to form a compound of formula (III) wherein R1 is as defined for formula (II) and b) saponifying that compound in sit.upsilon. leading to the formation of the compound of formula (I) by b1) adding a base to form the anion of the compound of formula (I) and then adding an; acid to form the compound of formula (I); or b2) adding an acid to form the compound of formula (I).

L'invention porte sur un procédé de fabrication d'un composé de formule (I), qui consiste : a) à faire réagir un composé de formule (II), dans laquelle R1 et R2 représentent tous deux indépendamment l'alkyle en C1-C6, avec de la méthylhydrazine en présence d'eau et d'un solvant organique non miscible à l'eau qui est inerte dans des réactions de saponification, afin de former un composé de formule (III) dans laquelle R1 est tel que défini pour la formule (II), et b) à saponifier ce composé in situ, conduisant à la fabrication du composé de formule (I) par b1) l'addition d'une base afin de former l'anion du composé de formule (I), puis l'addition d'un acide afin de former le composé de formule (I) ; ou b2) l'addition d'un acide afin de former le composé de formule (I).

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