反应详情

温度

0 °C

To a stirred solution of ethyl 4-amino-6-methoxyquinoline-3-carboxylate (Example 1a, 1.23 g, 5.0 mmol) in EtOH (20.0 mL) was added aqueous NaOH (2.0 N, 5.0 mL) at room temperature. The reaction mixture was then refluxed for 3 hr. The solution was then filtered and washed with water. The filtrate was cooled to 0° C. and neutralized carefully with 1 N HCl to pH 7. Most of the EtOH was removed under reduced pressure, and the precipitate was collected by filtration, washed with cold water, and dried under vacuum to give the title compound as an off-white solid (1.01 g, 93%). 1H NMR (400 MHz, DMSO-d6) δ 3.89 (s, 3H), 7.40 (dd, J=2.8, 9.4 Hz, 1H), 7.73 (d, J=9.4 Hz, 1H), 7.77 (d, J=2.8 Hz, 1H), 8.77 (s, 1H). MS 219 (MH+).

1. temperatureThe reaction mixture was then refluxed for 3 hr
2. filtrationThe solution was then filtered
3. washwashed with water
4. customMost of the EtOH was removed under reduced pressure
5. filtrationthe precipitate was collected by filtration
6. washwashed with cold water
7. customdried under vacuum