Method for producing n-substituted 3-hydroxypyrazoles

Details Method for producing n-substituted 3-hydroxypyrazoles Method for producing n-substituted 3-hydroxypyrazoles

C - Chemistry, Metallurgy

07

D

C07D 231/20 (2006.01) C07D 231/22 (2006.01)

Patent

CA 2275253

The invention relates to a method for producing n-substituted 3-hydroxypyrazoles of formula (I), wherein R1 stands for optionally substituted alkyl, alkenyl, alkinyl, cycloalkyl, aryl or heteroaryl and R2 and R3 mean hydrogen, cyano, halogen and optionally substituted alkyl, alkenyl, alkinyl, cycloalkyl, aryl or heteroaryl, by oxidizing a corresponding pyrazolidin-3-ons.

L'invention concerne un procédé pour la préparation de 3-hydroxypyrazols N-substitués de la formule (I), dans laquelle R<1> désigne alkyle, alcényle, alcinyle, cycloalkyle, aryle ou bien hétéroaryle éventuellement substitué, et R<2>, R<3> représentent hydrogène, cyano, halogène et alkyle, alcényle, alcinyle, cycloalkyle, aryle ou bien hétéroaryle éventuellement substitué, par oxydation d'une pyrazolidin-3-one correspondante.

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