反应详情

To a 200 mL round bottom flask was added 6-ethoxy-1,7-naphthyridin-8-amine (3.42 mmol), DCM (75 mL), followed by N-chlorosuccinimide (3.77 mmol). The mixture was heated at reflux for 18 h under Ar. The mixture was then cooled, the solvent evaporated and the resultant crude residue purified by silica gel to yield 5-chloro-6-ethoxy-1,7-naphthyridin-8-amine (480 mg, 63%) as a pale yellow solid. 1H NMR (400 MHz, CDCl3): δ ppm 8.89 (d, J=3.95 Hz, 1H), 8.43 (d, J=8.79 Hz, 1H), 7.66 (dd, J=8.79, 3.95 Hz, 1H), 4.13 (s, 3H).

1. temperatureThe mixture was heated
2. temperatureat reflux for 18 h under Ar
3. temperatureThe mixture was then cooled
4. customthe solvent evaporated
5. customthe resultant crude residue purified by silica gel