Water → 2-(2,6-Dimethylpyridin-4-yl)-7-(2-isopropoxyethoxy)-5-methoxyquinazolin-4(3H)-one

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Reaction Steps

To a suspension of sodium hydride (60% suspension in mineral oil, 0.24 g, 6.00 mmol) in anhydrous DMSO (10 mL) was added 2-isopropoxy-ethanol at room temperature under nitrogen. The mixture was stirred for 20 minutes at room temperature, then 2-(2,6-dimethyl-pyridin-4-yl)-7-fluoro-5-methoxy-3H-quinazolin-4-one (0.30 g, 1.00 mmol) was added and the reaction mixture was stirred at 80° C. for 16 hours, then cooled to room temperature. Water (50 mL) was added, and the mixture was extracted with a mixture of ethyl acetate and THF (4:1, 200 mL). The organic phase was washed with brine and dried over anhydrous sodium sulfate. Solvent was evaporated, and the crude compound was purified by the Simpliflash system (3:15:82 methanol, ethyl acetate and dichloromethane as eluent) to give the title compound as a white solid. Yield: 127 mg (33%). MP 188-189° C. 1H NMR (400 MHz, CDCl3): δ 11.14 (br s, 1H), 7.72 (s, 2H), 6.86 (d, J=2.34 Hz, 1H), 6.59 (d, J=2.34 Hz, 1H), 4.35-4.15 (m, 2H), 3.97 (s, 3H), 3.89-3.79 (m, 2H), 3.78-3.64 (m, 1H), 2.66 (s, 6H), 1.23 (d, J=5.85 Hz, 6H). MS (ES+) m/z: 384.20 (100%).

Provenance & Evidence