[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([O:8][CH3:9])=[CH:4][C:3]=1[C:10]1[CH:15]=[CH:14][CH:13]=[C:12]([F:16])[CH:11]=1.CC(O)=O.S(=O)(=O)(O)O.C1C(=O)N([I:33])C(=O)C1>C(Cl)Cl>[Cl:1][C:2]1[CH:7]=[C:6]([I:33])[C:5]([O:8][CH3:9])=[CH:4][C:3]=1[C:10]1[CH:15]=[CH:14][CH:13]=[C:12]([F:16])[CH:11]=1
A round-bottom flask was charged with 2-chloro-3′-fluoro-5-methoxy-1,1′-biphenyl (1.288 g, 5.44 mmol), DCM (8.00 ml), AcOH (8.00 ml), and sulfuric acid (0.160 ml, 2.99 mmol) to give a clear solution. n-Iodosuccinimide (1.224 g, 5.44 mmol) was added in one portion to give a maroon-colored solution. After 7 h, the mixture was diluted with DCM, washed with water, washed with saturated aq. sodium thiosulfate, dried over sodium sulfate, filtered, and concentrated. The residue was purified by chromatography on silica gel (40-g Redi-Sep Gold column, 25-g silica gel column, 0-5% EtOAc/Heptane) give 2-chloro-3′-fluoro-4-iodo-5-methoxy-1,1′-biphenyl (1.68 g, 4.63 mmol, 85% yield) as a clear oil. m/z (ESI) 362.0 (M+H)+.
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