Patent ID: 7462632

Claim:
A process for the preparation of a compound of formula: wherein: R 1 represents a hydrogen or halogen atom or a (C 1 -C 4 )alkyl group; R 2 , R 3 , R 4 , R 5 , R 6 and R 7 each independently represent, a hydrogen or halogen atom or a (C 1 -C 4 )alkyl, (C 1 -C 4 )alkoxy or trifluoromethyl group; and of its salts, characterized in that: a pentane derivative of formula: X—(CH 2 ) 5 —X′ (II) in which X and X′ each independently represent a halogen atom or a YSO 2 O— group in which Y represents a (C 1 -C 4 )alkyl group, a (C 1 -C 4 )perfluoroalkyl group, an unsubstituted phenyl group or a phenyl group substituted by a methyl, chloro or nitro group, is reacted with a pyrazole-3-carbohydrazide derivative of formula: in which R 1 , R 2 , R 3 , R 4 , R 5 , R 6 and R 7 are as defined above for (I), in the presence of a base, in a solvent and at a temperature between ambient temperature and the reflux temperature of the solvent.