Water → 1-(5-Tert-butylisoxazol-3-yl)-3-(5-(6,7-dimethoxyquinazolin-4-yloxy)-2,4-difluorophenyl)urea

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To a solution of 5-(6,7-dimethoxyquinazolin-4-yloxy)-2,4-difluoroaniline (100 mg, 0.3 mmol) in THF (10 mL), DIEA (58 mg, 0.45 mmol), DMAP (20 mg, 0.16 mmol), and phenyl 5-tert-butylisoxazol-3-ylcarbamate (117 mg, 0.32 mmol) were added and the mixture heated overnight at 70° C. The mixture was poured into water and extracted with EtOAc three times. The extracts were dried over magnesium sulfate, filtered, and concentrated. The residue was purified using silica gel chromatography eluting with EtOAc/Hexane (3-80%). The appropriate fractions were concentrated to afford 1-(5-tert-butylisoxazol-3-yl)-3-(5-(6,7-dimethoxyquinazolin-4-yloxy)-2,4-difluorophenyl)urea (37.56 mg, 25% yield). 1H NMR (300 MHz, CDCl3) δ 1.35 (s, 9H), 4.05 (s, 6H), 6.09 (s, 1H), 6.85 (s, 1H), 7.28 (s, 1H), 7.35 (s, 1H), 8.28 (m, 1H), 8.70 (s, 1H), 9.50 (s, 1H). LC-MS (ESI) m/z 500 (M+H)+

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