Process for the preparation of 1 5-disubstituted-4-cyano-pyrazoles

Abstract

Abstract REACTING A DERIVATIVE OF A B-KETO-NITRILE WITH A SUBSTITUTED HYDRAZINE OR THE CORRESPONDING ACID SALT THEREOF; I.E. AN ENOL ETHER OR ENAMINE OF B-KETONITRILE SUCH AS (ALKOXY-, ALKYLAMINO- AND PHENYLAMINO-METHYLENE)-(OPTIONALLY HALO, TRIFLUOROMETHYL, ALKYL AND/OR ALKOXY SUBSTITUTED-BENZOYL, AND FUROYL)-ACETONITRILE; WITH (OPTIONALLY HYDROXY AND CYANO SUBSTITUTED-ALKYL; CYCLOALKYL; OPTIONALLY CHLORO, NITRO, ALKYL AND/OR DIALKYLSULFONAMIDO SUBSTITUTED-PHENYL; AND PHENYL-ALKYL)-SUBSTITUTED HYDRAZINE, OR THE CORRESPONDING SALT THEREOF; IN THE PRECENCE OF A CARBONXYLIC ACID AT AN ELEVATED TEMPERATURE, E.G. 40-150*C., OPTIONALLY IN THE PRESENCE OF AN INERT SOLVENT; TO FORM THE CORRESPONDING 1,5-DISUBSTITUTED-4-CYANOPYRAZOLE; I.E. 1-(OPTIONALLY HYDROXY AND CYANO SUBSTITUTED-ALKYL; CYCLOALKYL; OPTIONALLY CHLORO, NITRO, ALKYL AND/OR DIALKYLSULFONAMIDO SUBSTITUTED-PHNEYL; AND PHENYL-ALKYL)-4-CYANO - 5 - (OPTIONALLY HALO, TRIFLUOROMETHYL, ALKYL AND/OR ALKOXY SUBSTITUTED-PHENYL, AND FURYL)PYRAZOLES; SOME OF WHICH ARE KNOWN AND ALL OF WHICH ARE FUNGICIDES AND INTERMEDIATES FOR THE PREPARATION OF CROP PROTECTION AGENTS AND PESTICIDES.

Inventors

• 👤 Hartmut Kiehne
• 👤 Siegfried Petersen

Bibliographic Details