反应详情

To a solution of ethyl 4-[4-(difluoromethyl)phenoxy]-2-methyl-1-benzofuran-6-carboxylate (710 mg, 2.05 mmol) and NBS (438 mg, 2.46 mmol) in CHCl3 (25 mL) was added benzoyl peroxide (49.7 mg, 0.205 mmol). The mixture was refluxed for 14 hours. The solvent was evaporated, and the product was purified via gradient silica gel chromatography using hexanes/EtOAc (100/0 to 70/30) to give the title compound (440 mg, 51%) as a light-yellow solid. 1H NMR (300 MHz, CHLOROFORM-D) δ ppm 1.38 (t, J=7.16 Hz, 3 H) 4.38 (q, J=7.16 Hz, 2 H) 4.53 (s, 2 H) 6.39-6.89 (m, 2 H) 7.07 (d, J=8.48 Hz, 2 H) 7.49 (d, J=8.48 Hz, 2 H) 7.54 (d, J=0.94 Hz, 1 H) 8.01 (s, 1 H).

1. temperatureThe mixture was refluxed for 14 hours
2. customThe solvent was evaporated
3. customthe product was purified via gradient silica gel chromatography