反应详情

温度

70 °C

Methyl 5-[(4,5-dichloro-2-fluoro-benzoyl)amino]pyridine-2-carboxylate (50 mg, 0.14 mmol), 4-fluoro-2-methoxy-phenol (18.27 μL, 0.16 mmol) and K2CO3 (60.41 mg, 0.44 mmol) were combined in DMF (0.5 mL) and heated at 70° C. for 1.5 hours to form methyl 5-[[4,5-dichloro-2-(4-fluoro-2-methoxy-phenoxy)benzoyl]amino]pyridine-2-carboxylate. Aqueous NaOH (145.7 μL of 3 M, 0.44 mmol) was then added and heating continued for 30 min. HPLC purification (1-99% CH3CN/5 mM HCl) provided 5-(4,5-dichloro-2-(4-fluoro-2-methoxyphenoxy)benzamido)picolinic acid (51) (35.28 mg, 54%) as a white solid. 1H NMR (400 MHz, DMSO-d6) δ 13.05 (s, 1H), 10.96 (s, 1H), 8.93 (d, J=2.4 Hz, 1H), 8.30 (dd, J=8.7, 2.5 Hz, 1H), 8.08 (d, J=8.6 Hz, 1H), 7.97 (s, 1H), 7.27 (dd, J=8.9, 5.8 Hz, 1H), 7.12 (dd, J=10.7, 2.9 Hz, 1H), 6.91 (s, 1H), 6.84 (td, J=8.5, 2.9 Hz, 1H), 3.75 (s, 3H) ppm. ESI-MS m/z calc. 450.02, found 451.1 (M+1)+; Retention time: 1.61 minutes (3 minutes run).