Sodium Sulfite → Methyl 4-amino-3-chloro-6-(2,5-difluoro-4-iodophenyl)-5-fluoropicolinate

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To a solution of methyl 4-amino-3-chloro-6-(2,5-difluoro-4-(trimethylsilyl)phenyl)-5-fluoropicolinate (0.280 g, 0.720 mmol) in CH2Cl2 (2.88 mL) at 20° C. was added iodine monochloride (0.144 mL, 2.880 mmol). The reaction mixture was stirred at 20° C. overnight. The mixture was then poured into a 10% aqueous solution of Na2SO3, extracted with EtOAc (3×), dried over Na2SO4, filtered and concentrated. The residue was purified by flash column chromatography (SiO2, hexanes/EtOAc gradient) to afford the title compound as a white solid (0.237 g, 0.536 mmol, 74.4%).

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