3-(6,7-Dimethoxyquinazolin-4-yloxy)-2-fluoroaniline → 1-(5-(1,3-Difluoro-2-methylpropan-2-yl)isoxazol-3-yl)-3-(3-(6,7-dimethoxyquinazolin-4-yloxy)-2-fluorophenyl)urea

Participants

Reaction Steps

A mixture of phenyl 5-(1,3-difluoro-2-methylpropan-2-yl)isoxazol-3-ylcarbamate (prepared as described in Example 162A steps 1 and 2) (211 mg, 0.714 mmol), 3-(6,7-dimethoxyquinazolin-4-yloxy)-2-fluoroaniline (prepared as described in Example 265A steps 1 through 3) (150 mg, 0.475 mmol) and N,N-4-(dimethylamino)pyridine (10 mg, 0.082 mmol) in THF (5 mL) was stirred at rt for 36 h. The reaction mixture was concentrated under reduced pressure to give the crude product. Purification via silica gel flash chromatography (eluting with a gradient of 20% ethyl acetate in hexanes to 100% ethyl acetate) afforded 1-(5-(1,3-difluoro-2-methylpropan-2-yl)isoxazol-3-yl)-3-(3-(6,7-dimethoxyquinazolin-4-yloxy)-2-fluorophenyl)urea (104 mg, 42%) as a colorless solid. 1H NMR (300 MHz, DMSO-d6) δ 9.96 (brs, 1H), 8.87 (brs, 1H), 8.58 (s, 1H), 8.08 (m, 1H), 7.59 (s, 1H), 7.43 (s, 1H), 7.27 (m, 1H), 7.15 (m, 1H), 6.81 (s, 1H), 4.66 (d, J=47 Hz, 4H), 4.01 (s, 6H), 1.34 (s, 3H); LC-MS (ESI) m/z 518 (M+H)+.

Provenance & Evidence