Potassium Carbonate → 4-Trifluoromethoxybenzyl 4-amino-3-chloro-6-(4-chloro-2-fluoro-3-methoxyphenyl)-5-fluoropicolinate

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A suspension of 4-amino-3-chloro-6-(4-chloro-2-fluoro-3-methoxyphenyl)-5-fluoropicolinic acid (200 mg, 0.573 mmol), 1-(bromomethyl)-4-(trifluoromethoxy)benzene (161 mg, 0.630 mmol) and K2CO3 (119 mg, 0.859 mmol) in DMF (2 mL) was heated at 50° C. overnight. The reaction mixture was then concentrated in vacuo. The residue was purified by silica gel chromatography (eluting with 0-80% EtOAc/hexane gradient) to yield a white solid (154 mg, 51.4%): mp 155-156° C.; 1H NMR (400 MHz, DMSO-d6) δ 7.60 (d, J=8.7 Hz, 2H), 7.47 (dd, J=8.5, 1.5 Hz, 1H), 7.41 (d, J=8.0 Hz, 2H), 7.29 (dd, J=8.5, 7.1 Hz, 1H), 7.14 (s, 2H), 5.41 (s, 2H), 3.95-3.90 (m, 3H); ESIMS m/z 523 ([M+H]+), 521 ([M−H]−).

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