反应详情

温度

100 °C

To methyl 5-[(3-chloroquinoxaline-2-carbonyl)amino]pyridine-2-carboxylate (51.41 mg, 0.15 mmol) in NMP (1 mL) was added 2,4-dimethoxyphenol (23.12 mg, 0.15 mmol) and potassium carbonate (62.19 mg, 0.45 mmol) and the reaction was heated at 100° C. for 1.5 hours. To the reaction were added 150 μL of MeOH and 150 μL of 3M sodium hydroxide and the reaction was stirred at 50° C. for 1.5 hours. The reaction was cooled to 25° C., filtered and purified by reverse phase preparative chromatography utilizing a gradient of 10-99% acetonitrile in water containing HCl as a modifier to yield 5-(3-(2,4-dimethoxyphenoxy)quinoxaline-2-carboxamido)picolinic acid (26) (26.63 mg, 36%). 1H NMR (400 MHz, DMSO-d6) δ 11.52 (s, 1H), 9.05 (d, J=2.5 Hz, 1H), 8.45 (dd, J=8.6, 2.5 Hz, 1H), 8.18 (dd, J=8.4, 1.6 Hz, 1H), 8.14 (d, J=8.6 Hz, 1H), 7.90-7.71 (m, 3H), 7.22 (d, J=8.7 Hz, 1H), 6.76 (d, J=2.8 Hz, 1H), 6.60 (dd, J=8.8, 2.8 Hz, 1H), 3.81 (s, 3H), 3.68 (s, 3H). ESI-MS m/z calc. 346.12, found 347.2 (M+1)+; Retention time: 1.30 minutes (3 minutes run).

1. temperatureThe reaction was cooled to 25° C.
2. filtrationfiltered
3. custompurified by reverse phase preparative chromatography
4. additioncontaining HCl as a modifier