[CH3:1][C:2]1[NH:3][N:4]([C:8]2[CH:13]=[CH:12][C:11]([CH3:14])=[CH:10][CH:9]=2)[C:5](=[O:7])[CH:6]=1.[F:15][C:16]([F:24])([F:23])[C:17](=[O:22])[C:18]([O:20][CH3:21])=[O:19]>C(Cl)(Cl)Cl>[CH3:21][O:20][C:18](=[O:19])[C:17]([OH:22])([C:16]([F:24])([F:23])[F:15])[C:6]1[C:5](=[O:7])[N:4]([C:8]2[CH:13]=[CH:12][C:11]([CH3:14])=[CH:10][CH:9]=2)[NH:3][C:2]=1[CH3:1]To a chloroform solution (5 ml) of 3-methyl-1-(4-methylphenyl)-5-pyrazolone (94 mg, 0.5 mmol), methyl trifluoropyruvate (78 mg, 0.5 mmol) was added at room temperature and the mixture was stirred at 80° C. for 2 hours. After removing the solvent under reduced pressure, the title compound was obtained as a pale yellow solid (172 mg).
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