Pyrazole derivatives and process for the production thereof

Details Pyrazole derivatives and process for the production thereof Pyrazole derivatives and process for the production thereof

C - Chemistry, Metallurgy

07

D

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

Patent

CA 2494130

The present invention provides pyrazole derivatives useful as production intermediates for isoxazoline derivatives having an excellent herbicidal effect and selectivity between crops and weeds as well as processes for producing the same. The pyrazole derivatives or pharmaceutically acceptable salts thereof which are inventive compounds are represented by the general formula [I] or a salt thereof: (see formula I) wherein R1 represents a C1 to C6 alkyl group, R2 represents a C1 to C3 haloalkyl group, R3 represents a hydrogen atom, a C1 to C3 alkyl group which may be substituted with one or more substituents selected from the following substituent group .alpha., or a formyl group, R4 represents a hydrogen atom or a C1 to C3 haloalkyl group, provided that R4 represents a C1 to C3 haloalkyl group in the case that R3 is a hydrogen or a formyl group, and R4 is a hydrogen group or a C1 to C3 haloalkyl group in the case that R3 is a C1 to C3 alkyl group which may be substituted with one or more substituents selected from the following substituent group .alpha..

La présente invention concerne des dérivés du pyrazole pouvant être utilisés comme intermédiaires dans la production de dérivés d'isoxazoline présentant une excellente activité herbicide et une excellente sélectivité plantes-mauvaises herbes et concerne également un procédé de production de ces dérivés. Cette invention concerne en outre les dérivés du pyrazole représentés par la formule générale (I) ou des sels pharmacologiquement acceptables de ces dérivés. Dans cette formule, R?1¿ désigne alkyle C¿1-6? ; R?2¿ désigne haloalkyle C¿1-3? ; R?3¿ désigne hydrogène, alkyle C¿1-3? pouvant avoir un ou plusieurs substituants sélectionnés à partir du groupe .alpha. de substituants, ou formyle ; et R?4¿ désigne hydrogène ou haloalkyle C¿1-3? (à condition que lorsque R?3¿ désigne hydrogène ou formyle, R?4¿ désigne haloalkyle C¿1-3? et lorsque R?3¿ désigne alkyle C¿1-3? pouvant avoir un ou plusieurs substituants sélectionnés à partir du groupe .alpha. de substituants, R?4¿ désigne hydrogène ou haloalkyle C¿1-3?).

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