[F:1][C:2]1[CH:24]=[C:23]([F:25])[CH:22]=[CH:21][C:3]=1[CH2:4][O:5][C:6]1[CH:11]=[CH:10][N:9]([CH2:12][C:13]2[CH:18]=[CH:17][CH:16]=[C:15]([F:19])[CH:14]=2)[C:8](=[O:20])[CH:7]=1.[I:26]N1C(=O)CCC1=O.ClC(Cl)C(O)=O>CC#N>[F:1][C:2]1[CH:24]=[C:23]([F:25])[CH:22]=[CH:21][C:3]=1[CH2:4][O:5][C:6]1[CH:11]=[CH:10][N:9]([CH2:12][C:13]2[CH:18]=[CH:17][CH:16]=[C:15]([F:19])[CH:14]=2)[C:8](=[O:20])[C:7]=1[I:26]To a mixture of 4-(2,4-difluorobenzyloxy)-1-(3-fluorobenzyl)-1H-pyridin-2-one (0.15 g, 0.43 mmol) and N-iodosuccinimide (0.10 g, 0.46 mmol) in CH3CN (3 mL) was added dichloroacetic acid (13 mg, 0.10 mmol), and the reaction mixture was heated to 60° C. for 4 h. The reaction mixture was cooled to room temperature, concentrated under reduced pressure, and the residue was dissolved in methylene chloride. The organic solution was washed with a saturated solution of NaHCO3 and then brine, dried (Na2SO4), filtered and concentrated under reduced pressure. Purification by flash column chromatography (silica, eluent 90:10 methylene chloride/hexanes to 99:1 methylene chloride/methanol) provided 4-(2,4-difluorobenzyloxy)-1-(3-fluorobenzyl)-3-iodo-1H-pyridin-2-one as a white solid (0.15 g, 77%): mp 164-167° C.; 1H NMR (300 MHz, CDCl3) δ 7.65-7.55 (m, 1H), 7.35-7.26 (m, 2H) 7.15-6.80 (m, 5H), 6.05 (d, J=6 Hz, 1H), 5.22 (s, 2H), 5.16 (s, 2H). ESHRMS m/z 472.0033 (M+H C19H14F31NO2 requires 472.0018).
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