Patent ID: 6855827

Claim:
A compound of formula (I′ a ) chosen from the compound of the following formula (I′a): in which: R′ 1 represents: a hydrogen atom, a linear or branched C 1 -C 20 alkyl radical, optionally substituted by 1 or 2 radicals R chosen from a halogen atom, a nitro radical, a cyano radical, a hydroxyl radical, an alkoxy radical, an aryloxy radical, an amino radical, an alkylamino radical, an acylamino radical, a carbamoyl radical, a sulphonamido radical, a sulphamoyl radical, an imido radical, an alkylthio radical, an arylthio radical, an aryl radical, a (C 1 -C 4 )alkoxy-carbonyl radical and an acyl radical; an aryl radical optionally substituted by 1 or 2 radicals R as defined above: a 5- or 6-membered heterocycle containing at least one nitrogen, oxygen, or sulphur atom wherein said heterocycle is optionally substituted by 1 or 2 radicals R as defined above; when R′ 1 denotes a C 1 -C 4 alkyl radical, an aryl radical or a 5- or 6-membered heterocycle, it can be connected to the carbon atom of the pyrazole via an oxygen, nitrogen, or sulphur atom; or R′ 1 can, additionally, denote a halogen atom; an acyl radical; a sulphonyl radical; a sulphinyl radical; a phosphonyl radical; a carbamoyl radical; a sulphamoyl radical; a cyano radical; a siloxy radical, an amino radical; an acylamino radical; an acyloxy radical; a carbamoyloxy radical; a sulphonamide radical; an imide radical; a ureido radical; a sulphamoylamino radical; a (C 1 -C 4 )alkoxy-carbonylamino radical; an aryloxycarbonylamino radical; a (C 1 -C 4 )alkoxy-carbonyl radical; an aryloxycarbonyl radical; a carboxyl radical; or a hydroxyl radical; R′ 2 is a hydrogen atom; a C 1 -C 4 alkyl radical; a C 1 -C 4 monohydroxyalkyl radical; a C 2 -C 4 polyhydroxyalkyl radical, a C 1 -C 4 aminoalkyl radical; a (CH 2 ) p —X—(CH 2 ) g OR′ radical in which p and q are identical or different integers ranging from 1 to 3, R′ represents a hydrogen atom or a methyl radical, and X denotes an oxygen atom or an NR″ group in which R″ represents a hydrogen atom or a methyl radical; a (C 1 -C_)alkoxy(C 2 -C 4 )alkyl radical; or a di(C 1 -C 4 )alkylamino(C 1 -C 4 )alkyl radical; R′ 3 has the same meanings as those indicated above for R′ 1 .