反应详情

温度

0 °C

To a solution of 4-[4-(difluoromethyl)phenoxy]-6-(ethoxycarbonyl)-1-benzofuran-2-carboxylic acid (300 mg, 0.80 mmol) in DMF (10 mL) was added HATU (606 mg, 1.59 mmol), DIEA (515 mg, 4.0 mmol) and the solution was stirred at 0° C. for 15 min. Dimethylamine hydrochloride (97.5 mg, 1.20 mmol) was added and the solution was warmed gradually to room temperature and stirred for 14 h. Water was added to the reaction and the product was extracted with CHCl3. The combined organic layers were washed with water twice, dried over MgSO4, and concentrated. The product was purified via gradient silica gel chromatography using CHCl3/MeOH (100/0 to 95/5) to give the title compound (240 mg, 70%) as a light yellow solid. 1H NMR (300 MHz, CHLOROFORM-D) δ ppm 1.38 (t, J=7.16 Hz, 3 H) 3.13 (s, 3 H) 3.32 (s, 3 H) 4.38 (q, J=7.16 Hz, 2 H) 6.64 (t, J=56.61 Hz, 1 H) 7.09 (d, J=8.48 Hz, 2 H) 7.16 (s, 1 H) 7.50 (d, J=8.48 Hz, 2 H) 7.55 (s, 1 H) 8.05 (s, 1 H).

1. temperaturethe solution was warmed gradually to room temperature
2. stirringstirred for 14 h
3. extractionthe product was extracted with CHCl3
4. washThe combined organic layers were washed with water twice
5. dry with materialdried over MgSO4
6. concentrationconcentrated
7. customThe product was purified via gradient silica gel chromatography