[F:1][C:2]1[CH:10]=[C:9]([F:11])[C:8]([F:12])=[CH:7][C:3]=1[C:4]([OH:6])=O.C(Cl)(=O)C(Cl)=O.[NH2:19][C:20]1[C:21](=[O:33])[N:22]([C:26]2[CH:31]=[CH:30][C:29]([F:32])=[CH:28][CH:27]=2)[CH:23]=[CH:24][CH:25]=1>ClCCl.CN(C=O)C>[F:1][C:2]1[CH:10]=[C:9]([F:11])[C:8]([F:12])=[CH:7][C:3]=1[C:4]([NH:19][C:20]1[C:21](=[O:33])[N:22]([C:26]2[CH:31]=[CH:30][C:29]([F:32])=[CH:28][CH:27]=2)[CH:23]=[CH:24][CH:25]=1)=[O:6]
To a solution of 2,4,5-trifluorobenzoic acid (Aldrich, 704 mg, 4.0 mmol) in dichloromethane (20 mL), was added oxalyl chloride (Aldrich, 0.70 mL, 8.0 mmol) dropwise, followed by two drops of DMF. The reaction mixture was stirred at room temperature for 2 h, and concentrated in vacuo. Toluene (20 mL) was added and the reaction mixture was evaporated in vacuo to remove the excess oxalyl chloride. The residue was dissolved in dichloromethane (20 mL). Half of this acid chloride solution was added to a mixture of 3-amino-1-(4-fluorophenyl)pyridin-2(1H)-one (306 mg, 1.5 mmol) in dichloromethane (5 mL) and TEA (0.5 mL, Aldrich) at 0° C. The reaction mixture was stirred at room temperature for 1 h. The precipitate that formed was collected by filtration, and washed with methanol, to afford the desired product (363 mg, 67% yield) as a solid. MS(ESI+) m/z 363.25 (M+H)+.
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