Cesium carbonate → 1-(5-Tert-butyl-isoxazol-3-yl)-3-{3-[7-(3-chloro-propoxy)-6-methoxy-quinazolin-4-yloxy]-phenyl}-urea

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To a solution of (1-(5-tert-butyl-isoxazol-3-yl)-3-(3-hydroxy-phenyl)-urea, 300 mg, 1.089 mmol) from Example 1A and (4-chloro-7-(3-chloro-propoxy)-6-methoxy-quinazoline (343.96 mg, 1.119 mmol), from the previous step in THF, was added Cs2CO3 (532.2 mg, 1.63 mmol) and the mixture was heated at 50° C. for 12 hours. Completion of the reaction was monitored by LCMS. The reaction mixture was diluted with ethyl acetate and the ethyl acetate layer was washed with water and brine successively. The organic layer was dried (Na2SO4) and concentrated to dryness. The crude compound was purified by column chromatography to afford the pure compound 1-(5-tert-butyl-isoxazol-3-yl)-3-{3-[7-(3-chloro-propoxy)-6-methoxy-quinazolin-4-yloxy]-phenyl}-urea, (310 mg, 61%) as a white solid. 1H NMR (300 MHz, DMSO-d6) δ 9.55 (s, 1H), 9.00 (s, 1H), 8.55 (s, 1H), 7.55 (m, 2H), 7.40 (m, 2H), 7.25 (d, 1H), 6.95 (d, 1H), 6.45 (s, 1H), 4.35 (t, 2H), 4.00 (s, 3H), 3.85 (2, 2H), 1.30 (s, 9H); LC-MS (ESI)m/z 526 (M+H)+.

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