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

Participants

Reaction Steps

To a stirred solution of 5-(6,7-dimethoxyquinazolin-4-yloxy)-2,4-difluoroaniline (100 mg, 0.3 mmoles) from the previous step and phenyl 3-(2-fluoropropan-2-yl)isoxazol-5-ylcarbamate described in Example 42A (96 mg, 0.32 mmoles) in anhydrous DMF (10 mL), was added 4-(dimethylamino)pyridine (20 mg, 0.16 mmoles) and diisopropylethylamine (80 μL, 0.45 mmoles) and the reaction heated to 70 C overnight. The reaction was then concentrated to an oil and purified by silica gel chromatography eluting with a gradient of ethyl acetate/dichloromethane, 3-80%, to afford 1-(5-(6,7-dimethoxyquinazolin-4-yloxy)-2,4-difluorophenyl)-3-(3-(2-fluoropropan-2-yl)isoxazol-5-yl)urea (46.33 mg, 31% yield) as a white solid. 1H (300 MHz, DMSO-d6) δ 10.58 (s, 1H), 8.92 (s, 1H), 8.57 (s, 1H), 8.13 (m, 1H), 7.67 (m, 1H), 7.57 (s, 1H), 7.41 (s, 1H), 6.12 (s, 1H), 3.98 (s, 6H), 1.65 (d, J=21 Hz, 6H); LCMS (ESI) m/z (M+H)+ 504.

Provenance & Evidence