Acetyl chloride → Methyl 4-amino-6-(4-chloro-2-fluoro-3-methoxyphenyl)-3-methoxypicolinate

Participants

Reaction Conditions

Reaction Steps

Methyl 4-acetamido-6-(4-chloro-2-fluoro-3-methoxyphenyl)-3-methoxypicolinate (209 mg, 0.55 mmol) was dissolved in CH3OH (10 mL), and acetyl chloride (194 μL, 2.73 mmol) was added dropwise to the mixture. The reaction mixture was allowed to stir at 25° C. for 3 h. Additional acetyl chloride (194 μL, 2.73 mmol) was then added, and the reaction mixture was allowed to stir at 25° C. overnight. The reaction mixture was concentrated to dryness and purified by flash chromatography (SiO2; 0-50% EtOAc/hexane gradient) to provide the title compound as an off-white solid (30 mg, 16%): mp 114-118° C.; 1H NMR (400 MHz, CDCl3) δ 7.61 (dd, J=8.5, 7.8 Hz, 1H), 7.22 (dd, J=8.6, 1.8 Hz, 1H), 7.18 (d, J=2.1 Hz, 1H), 4.54 (s, 1H), 3.98 (s, 2H), 3.96 (d, J=0.8 Hz, 2H), 3.92 (s, 2H); ESIMS m/z 341 ([M+H]+), 339 ([M−H]−).

Provenance & Evidence