Preparation of n-substituted 3-hydroxypyrazoles

Details Preparation of n-substituted 3-hydroxypyrazoles Preparation of n-substituted 3-hydroxypyrazoles

C - Chemistry, Metallurgy

07

D

C07D 231/20 (2006.01) C07D 231/22 (2006.01) C07D 401/04 (2006.01) C07D 403/04 (2006.01)

Patent

CA 2223634

A process for producing N-substituted 3-hydroxypyrazoles of formula (I) in which R1 is optionally substituted alkyl, aryl or heteroaryl, and R2, R3 are hydrogen, cyano, halogen and optionally substituted alkyl, aryl or heteroaryl, by the oxidation of a corresponding pyrazolidin-3-one.

L'invention concerne le procédé de production de 3-hydroxypyrazoles à substitution N de la formule (I) où R<1> représente alkyle, aryle ou hétéro-aryle éventuellement substitués; et où R<2>, R<3> représentent hydrogène, cyano, halogène ou bien alkyle, aryle ou hétéro-aryle éventuellement substitués, obtenus par oxydation d'un pyrazolidin-3-one correspondant.

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