Hydroxylamine → 4-amino-3-chloro-6-(4-chloro-2-fluoro-3-methoxyphenyl)-N-hydroxypicolinamide

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A 50% aq solution of hydroxylamine (4.4 mL, 72 mmol, 50 equiv) was added to a stirred suspension of methyl 4-amino-3-chloro-6-(4-chloro-2-fluoro-3-methoxyphenyl)picolinate (500 mg, 1.4 mmol, 1.0 equiv) in 1,2-dimethoxyethane (1.0 mL) at 23° C. The resulting white suspension was stirred at 23° C. for 4 days (d). The reaction mixture was concentrated by rotary evaporation to afford a white powder (500 mg, 99%): mp 166-169° C.; 1H NMR (300 MHz, DMSO-d6) δ 9.19 (br s, 1H), 7.68 (t, J=8 Hz, 1H), 7.42 (m, 1H), 7.20 (m, 1H), 6.73 (br s, 2H), 6.53 (br s, 1H), 3.93 (s, 3H); IR (neat film) 3322 (m), 2941 (w), 2878 (w), 1653 (s), 1632 (s) cm−1; ESIMS m/z 346.2 ([M+H]+).

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