Cesium carbonate → 3-(6,7-Dimethoxyquinazolin-4-yloxy)-4-fluoroaniline

Participants

Reaction Steps

To a stirred slurry of cesium carbonate (9.53 g, 29 mmol) in a mixture of THF/DMF (9/1, 200 mL) at rt, was added 5-amino-2-fluorophenol (2.10 g, 14.6 mmol) in one portion. After stirring for 30 min at rt, 4-chloro-6,7-dimethoxyquinazoline (3.61 g, 16 mmol) was added and the reaction mixture was heated at 50° C. for 30 h. The reaction was cooled to rt, then diluted with ethyl acetate. The solution was washed with 1 N sodium hydroxide solution, then brine, and dried over MgSO4. Filtration followed by concentration under reduced pressure gave a solid that was triturated with methanol. Filtration afforded 3-(6,7-dimethoxyquinazolin-4-yloxy)-4-fluoroaniline (3.10 g, 67%) as a yellow solid. 1H NMR (400 MHz, DMSO-d6) δ 8.57 (s, 1H), 7.54 (s, 1H), 7.41 (s, 1H), 7.05 (dd, J=9.2, 9.2 Hz, 1H), 6.47-6.56 (m, 2H), 5.19 (brs, 2H), 4.00 (s, 3H), 3.99 (s, 3H); LC-MS (ESI) m/z 316 (M+H)+.

Provenance & Evidence