Pyridine → 5-bromo-2-((hydroxyimino)methyl)-N-methyl-6-(N-methylmethylsulfonamido)benzofuran-3-carboxamide

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A mixture of 5-bromo-2-formyl-N-methyl-6-(N-methylmethylsulfonamido)benzofuran-3-carboxamide (700 mg, 1.8 mmol), hydroxylamine hydrochloride (280 mg, 4.05 mmol) and pyridine (284 mg, 3.6 mmol) in DMSO (5 mL) was stirred at room temperature for 2 h. The mixture was diluted with water, then filtered, the residue was crude product of 5-bromo-2-((hydroxyimino)methyl)-N-methyl-6-(N-methylmethylsulfonamido)benzofuran-3-carboxamide (650 mg, yield: 75%). 1H-NMR (DMSO-d6, 400 MHz) δ 12.26 (s, 1H), 8.46 (s, 1H), 8.41 (d, J=4.4 Hz, 1H), 8.18 (s, 1H), 8.06 (s, 1H), 3.20 (s, 3H), 3.19 (s, 3H), 2.83 (d, J=4.4 Hz, 3H). MS (M+H)+: 404/406.

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