Cesium carbonate → 1-(5-Tert-butylisoxazol-3-yl)-3-(3-(7-(2-methoxyethoxy)quinazolin-4-yloxy)phenyl)urea

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Reaction Steps

1-(5-tert-Butylisoxazol-3-yl)-3-(3-(7-hydroxyquinazolin-4-yloxy)phenyl)urea (126 mg, 0.3 mmol) was treated with cesium carbonate (117 mg, 0.36 mmol) in anhydrous N,N′-dimethylformamide (3 mL) and stirred at room temperature for 30 minutes. 2-Bromoethylmethyl ether (50 mg, 0.36 mmol) was added and the mixture was stirred at 50° C. overnight. Cesium carbonate was filtered off and the residue purified by preparative HPLC (phenylhexyl reverse phase column) to afford 1-(5-tert-butylisoxazol-3-yl)-3-(3-(7-(2-methoxyethoxy)quinazolin-4-yloxy)phenyl)urea (21.16 mg, 15%) as a solid. 1H NMR (300 MHz, DMSO-d6) δ 9.58 (bs, 1H), 9.00 (bs, 1H), 8.65 (s, 1H), 8.27 (d, 1H), 7.57 (s, 1H), 7.41-7.38 (m, 3H), 7.28 (d, 1H), 6.98 (d, 1H), 6.48 (s, 1H), 4.34 (bs, 2H), 3.76 (bs, 2H), 3.35 (s, 3H), 1.27 (s, 9H); LC-MS (ESI) m/z 478 (M+H)+.

Provenance & Evidence