Formic Acid → N-(2-fluoro-4-iodophenyl)formamide

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To a cooled solution (0° C.) of 4-iodo-2 fluoroaniline (3.05 g, 12.9 mmol) in tetrahydrofuran (15 mL) and toluene (15 mL), was slowly added a mixture of acetic anhydride (1.39 mL, 14.7 mmol) and formic acid (0.83 mL, 22.0 mmol). The reaction mixture was stirred at rt overnight, then diluted with ethyl acetate (100 mL) and 1N aqueous HCl (100 mL). The layers were separated, and the organic layer was washed with water and saturated sodium carbonate solution, and dried over sodium sulfate. The solvent was removed under reduced pressure to afford 2-fluoro-4-iodophenylformamide as an off-white solid (3.32 g, 97%). GC-MS ret. time 2.27 min, m/z 265 (M+); 1H NMR (300 MHz, CDCl3) δ: 7.37-7.51 (m, 3H), 8.13 (t, 1H), 8.46 (s, 1H).

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