Diisopropylethylamine → 3-(5-(2-Methyl-1-morpholinopropan-2-yl)isoxazol-3-yl)urea

Participants

Reaction Steps

A stirred solution of phenyl 5-(2-methyl-1-morpholinopropan-2-yl)isoxazol-3-ylcarbamate (22 mg), N,N-diisopropylethylamine (12 mg, 0.093 mmol) and 3-(6,7-dimethoxyquinazolin-4-yloxy)aniline (prepared as described in Example 113A) (15 mg, 0.051 mmol) in THF (0.5 mL) was heated at 60° C. for 15 h. The reaction mixture was cooled to rt and partitioned between saturated aqueous sodium carbonate and dichloromethane. The organic layer was separated and concentrated under reduced pressure to give the crude product. Purification via preparative TLC afforded 14346,7-dimethoxyquinazolin-4-yloxy)phenyl)-3-(5-(2-methyl-1-morpholinopropan-2-yl)isoxazol-3-yl)urea (5 mg, 1% over three steps) as a solid. 1H NMR (400 MHz, CDCl3) 89.35 (brs, 1H), 8.65 (brs, 2H), 7.66 (s, 1H), 7.57 (s, 1H), 7.29-7.41 (m, 3H), 7.01 (m, 1H), 6.10 (s, 1H), 4.09 (s, 6H), 3.63-3.66 (m, 4H), 2.40-2.70 (m, 6H), 1.32 (s, 6H); LC-MS (ESI) m/z 549 (M+H)+.

Provenance & Evidence