Preparation of 1-(het)aryl-3-hydroxypyrazoles

Details Preparation of 1-(het)aryl-3-hydroxypyrazoles Preparation of 1-(het)aryl-3-hydroxypyrazoles

C - Chemistry, Metallurgy

07

D

C07D 231/22 (2006.01) C07D 401/04 (2006.01) C07D 403/04 (2006.01) C07D 405/04 (2006.01) C07D 409/04 (2006.01) C07D 413/04 (2006.01) C07D 417/04 (2006.01)

Patent

CA 2147725

A process for preparing 1-(het)aryl-3-hydroxypyrazoles of the formula I Image I where R is an unsubst. or subst. aromatic or heteroaromatic radical, n is 0, 1 or 2 and R' is a group which is stable under the reaction conditions, from propiolic acid esters of the formula II R'-CC-CO2R1 II where R1 is an alkyl, cycloalkyl or aryl group, and (het)arylhy- drazines of the formula III R-NH-NH2 III in a solvent in the presence of a base, which comprises first mixing II and III with one another in a solvent and then treating this mixture with the base at from 0°C to 60°C is described.

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