Process for the preparation of 1-aryl-5-amino-pyrazoles

Details Process for the preparation of 1-aryl-5-amino-pyrazoles Process for the preparation of 1-aryl-5-amino-pyrazoles

C - Chemistry, Metallurgy

07

D

260/280, 260/315

C07D 231/38 (2006.01) C07D 401/04 (2006.01)

Patent

CA 1313375

ABSTRACT A process for the preparation of a 1-aryl-5- amino-pyrazole of the formula Image in which Ar is in each case optionally substituted phenyl or pyridyl, comprising reacting an arylhydrazine of the formula Ar-NH-NH2 with acrylonitrile of the formula CH2=CH-CN in a first stage in the presence of a diluent at a temperature between about 20°C and 100°C to form the arylhydrazine derivative of the formula Ar-NH-NH-CH2-CH2-CN, and in a second stage contacting such derivative with an Le A 24 464 -U S oxidizing agent in the presence of a base at a temperature between about 0°C and 60°C, thereby to effect oxidation and cyclization. The products are known intermediates for herbicides and insecticides.

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