Process for production of 5-alkoxy-4-hydroxymethylpyrazole...

C - Chemistry – Metallurgy – 07 – D

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C07D 231/20 (2006.01)

Patent

CA 2642308

Disclosed is a process for production of a 5-alkoxy-4-hydroxymethylpyrazole compound with good efficiency in a simple manner. A process for production of a 5-alkoxy-4-hydroxymethylpyrazole compound represented by the general formula (3): (3) [wherein R1 represents a substituent such as an alkyl group and an aryl group which may have a substituent; R2 represents an electron-withdrawing group; and R3 represents a substituent such as an alkyl group which may have a substituent] comprises the step of reacting a pyrazole compound represented by the general formula (1): (1) [wherein R1 and R2 are as defined above] with a compound represented by the general formula (2): L-R3 (2) [wherein L represents a leaving group; and R3 is as defined above] in the presence of a base and formaldehyde.

La présente invention concerne un procédé de production d'un composé 5-alcoxy-4-hydroxyméthylpyrazole avec un bon rendement de façon simple. Un procédé de production d'un composant 5-alcoxy-4-hydroxyméthylpyrazole représenté par la formule générale (3) : (3) [dans laquelle R1 représente un substituant tel qu'un groupe alkyle et un groupe aryle qui peuvent avoir un substituant; R2 représente un groupe attracteur d'électrons; et R3 représente un substituant tel qu'un groupe alkyle qui peut avoir un substituant] comprend l'étape consistant à faire réagir un composé pyrazole représenté par la formule générale (1) : (1) [dans laquelle R1 et R2 sont tels que définis ci-dessus] avec un composé représenté par la formule générale (2) : L-R3 (2) [dans laquelle L représente un groupe partant; et R3 est tel que défini ci-dessus] en présence d'une base et de formaldéhyde.

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