反应详情

To a stirred solution of 3-(6-ethoxy-7-methoxyquinazolin-4-ylthio)aniline (100 mg, 0.305 mmol) and phenyl 5-(1,1,1-trifluoro-2-methylpropan-2-yl)isoxazol-3-ylcarbamate described in Example 260A (144 mg, 0.458 mmol) in anhydrous THF (5 mL), was added 4-(dimethylamino)pyridine (6 mg, 0.0492 mmol) and the mixture was stirred at rt for 15 h. Concentration in vacuo followed by purification via silica gel column chromatography (eluted with a gradient of 20% ethyl acetate in hexanes to 100% ethyl acetate), afforded 1-(3-(6-ethoxy-7-methoxyquinazolin-4-ylthio)phenyl)-3-(5-(1,1,1-trifluoro-2-methylpropan-2-yl)isoxazol-3-yl)urea (35 mg, 21%) as a colorless solid. 1H NMR (300 MHz, DMSO-d6) δ 9.74 (brs, 1H), 9.02 (s, 1H), 8.69 (s, 1H), 7.85 (m, 1H), 7.28-7.51 (m, 5H), 6.88 (s, 1H), 4.23 (q, J=7 Hz, 2H), 3.99 (s, 3H), 1.54 (s, 6H), 1.45 (t, J=7 Hz, 3H); LC-MS (ESI) m/z 548 (M+H)+.

1. concentrationConcentration in vacuo
2. customfollowed by purification via silica gel column chromatography (
3. washeluted with a gradient of 20% ethyl acetate in hexanes to 100% ethyl acetate),