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

Participants

Reaction Steps

A mixture of 4-chlorophenyl 3-(2-fluoropropan-2-yl)isoxazol-5-ylcarbamate (prepared as described in Example 257A) (170 mg, 0.571 mmol), 3-(6,7-dimethoxyquinazolin-4-yloxy)-4-fluoroaniline (prepared as described in Example 266A steps 1 and 2) (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 15 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-(3-(6,7-dimethoxyquinazolin-4-yloxy)-4-fluorophenyl)-3-(3-(2-fluoropropan-2-yl)isoxazol-5-yl)urea (147 mg, 64%) as a colorless solid. 1H NMR (300 MHz, DMSO-d6) δ 10.44 (brs, 1H), 9.08 (brs, 1H), 8.58 (s, 1H), 7.69 (m, 1H), 7.59 (s, 1H), 7.35-7.42 (m, 3H), 6.14 (s, 1H), 4.00 (s, 6H), 1.67 (d, J=21 Hz, 6H); LC-MS (ESI) m/z 486 (M+H)+.

Provenance & Evidence