Cesium carbonate → 1-(5-Tert-butylisoxazol-3-yl)-3-[3-(7-ethoxy-6-methoxyquinazolin-4-ylthio)phenyl]urea

Participants

Reaction Conditions

Reaction Steps

A mixture of 1-(5-tert-butylisoxazol-3-yl)-3-(3-mercaptophenyl)urea described in Example 44A (0.146 g 0.5 mmol), 4-chloro-7-ethoxy-6-methoxyquinazoline from Example 6B Step 1 (0.12 g, 0.5 mmol), and Cs2CO3 (0.161 mg, 0.5 mmol) in isopropanol (10 mL) was heated at 70° C. for 7 hours. It was quenched with water and extracted with CH2Cl2. Extracts were dried over MgSO4 and concentrated under reduced pressure. It was purified by silica gel chromatography with EtOAc/hexane as eluant to afford 1-(5-tert-butylisoxazol-3-yl)-3-[3-(7-ethoxy-6-methoxyquinazolin-4-ylthio)phenyl]urea as solid (0.118 g, 48%). 1H NMR (300 MHz, CDCl3) δ 9.3 (br, 1H), 8.74 (s, 1H), 8.05 (s, 1H), 7.86 (s, 1H), 7.62 (d, 1H), 7.37 (m, 3H), 7.25 (1H), 5.91 (s, 1H), 4.29 (q, 2H), 4.06 (s, 3H), 1.58 (t, 3H), 1.32 (s, 9H); LC-MS (ESI) m/z 494 (M+H)+.

Provenance & Evidence