反应详情

A solution of 2-[4-(2-bromo-ethoxy)-3,5-dimethyl-phenyl]-5,7-difluoro-3H-quinazolin-4-one (1.38 g, crude) and pyrrolidine (10 mL) was stirred at room temperature for 16 hours. Excess pyrrolidine was evaporated, the residue was purified by column chromatography (silica gel 230-400 mesh; 30-50% ethyl acetate in hexanes as eluent). The compound was further purified by preparative HPLC to give the title compound as a white solid. Yield: 260 mg (13% for two steps). MP 206.6-206.8° C. 1H NMR (400 MHz, DMSO-d6): δ 11.85 (s, 1H), 6.63 (d, J=8 Hz, 1H), 6.51 (d, J=12 Hz, 1H), 3.90 (t, J=4 Hz, 2H), 2.83 (t, J=4 Hz, 2H), 2.50 (s, 6H), 2.30 (s, 4H), 1.89 (s, 4H), 1.70 (s, 4H).

1. customExcess pyrrolidine was evaporated
2. customthe residue was purified by column chromatography (silica gel 230-400 mesh; 30-50% ethyl acetate in hexanes as eluent)
3. customThe compound was further purified by preparative HPLC