反应详情

A mixture of ethyl 2-(2-carbamoyl-6-fluorophenylamino)-2-oxoacetate (600 mg, 2.4 mmol) and potassium t-butoxide (300 mg, 6.7 mmol) in EtOH (10 mL) was stirred at rt for 5 h. Saturated aq NaCl (50 mL) and HOAc (0.5 mL) were added and the mixture was extracted with EtOAc (3×80 mL). The combined organic layers were washed with brine (80 mL), dried over Na2SO4, filtered, and concentrated under reduced pressure to afford ethyl 8-fluoro-4-hydroxyquinazoline-2-carboxylate (530 mg, 93%). 1H NMR (300 MHz, DMSO-d6) δ 1.39 (t, J=7.2 Hz, 3H), 4.40 (q, J=7.2 Hz, 2H), 7.57-7.70 (m, 1H), 7.78 (t, J=9.2 Hz, 1H), 7.99 (d, J=8.1 Hz, 1H), 12.86 (s, 1H); LC-MS (ESI) m/z 237 (M+H)+.

1. extractionthe mixture was extracted with EtOAc (3×80 mL)
2. washThe combined organic layers were washed with brine (80 mL)
3. dry with materialdried over Na2SO4
4. filtrationfiltered
5. concentrationconcentrated under reduced pressure