[CH3:1][C:2]1[CH:6]=[C:5]([CH3:7])[N:4]([C:8]2[CH:16]=[CH:15][C:11]([C:12](O)=[O:13])=[CH:10][CH:9]=2)[N:3]=1.C(Cl)(=O)C([Cl:20])=O>ClCCl.CN(C)C=O>[CH3:1][C:2]1[CH:6]=[C:5]([CH3:7])[N:4]([C:8]2[CH:16]=[CH:15][C:11]([C:12]([Cl:20])=[O:13])=[CH:10][CH:9]=2)[N:3]=1To a suspension of 4-(3,5-dimethylpyrazol-1-yl)benzoic acid (1.34 g) in dichloromethane (25 ml) was added oxalyl chloride (1.0 g) and one drop of dimethylformamide. The mixture was stirred at room temperature for 18 hours and the volatile material was removed under reduced pressure. The residue was dissolved in hexane and filtered through diatomaceous earth. Evaporation of the solvent in vacuo yielded 4-(3,5-dimethylpyrazol-1-yl)benzoyl chloride (0.80 g), which was used without further purification.
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