To a solution of 2-methoxyethanol (3 mL) in dimethyl sulfoxide (8 mL), sodium hydride (60% suspension in mineral oil, 0.40 g, 9.40 mmol) was added in portions and the reaction mixture was stirred at room temperature for 1 hour. To this reaction mixture was added 2-(2,6-dimethyl-pyridin-4-yl)-7-fluoro-5-methoxy-3H-quinazolin-4-one (0.28 g, 0.94 mmol) and the reaction mixture was stirred at 90° C. for 16 hours. Water was added, acidified to pH approximately 4-5 with acetic acid, and the precipitated solid was filtered to give crude product, which was purified by preparative HPLC, to obtain the title compound as a white solid. Yield: 0.12 g (36%). MP 228.8-230.4° C. MS (ES) m/z: 356.05 (M++1). 1H NMR (400 MHz, CDCl3): δ 10.45 (s, 1H), 7.65 (s, 2H), 6.85 (d, J=1.6 Hz, 1H), 6.61 (d, J=1.6 Hz, 1H), 4.27 (t, J=4.8 Hz, 2H), 3.97 (s, 3H), 3.82 (t, J=4.8 Hz, 2H), 3.49 (s, 3H), 2.66 (s, 6H).
