反应详情

To a solution of 2-ketopyrrolidine (75.1 mg, 0.882 mmol) in DMF (10 mL) was added NaH (60% in mineral oil, 44 mg, 1.1 mmol) at room temperature. After stirring the reaction for 30 min, ethyl 2-(bromomethyl)-4-(4-(methylsulfonyl)phenoxy)benzofuran-6-carboxylate (285a) (200 mg, 0.441 mmol) was added. The mixture was stirred at room temperature for another 2 h. Water was added to the reaction, and the product was extracted with CHCl3. The combined organic layer was dried and concentrated. The product was purified by gradient silica gel chromatography using CHCl3/MeOH (100/0 to 95/5) to give the title compound (50 mg, 25%) as a yellow oil. 1H NMR (300 MHz, CHLOROFORM-D) δ ppm 1.38 (t, J=7.16 Hz, 3 H) 1.98-2.14 (m, 2 H) 2.42 (t, J=8.10 Hz, 2 H) 3.06 (s, 3 H) 3.44 (t, J=7.06 Hz, 2 H) 4.38 (q, J=7.16 Hz, 2 H) 4.58 (s, 2 H) 6.49 (d, J=0.75 Hz, 1 H) 7.04-7.12 (m, 2 H) 7.61 (d, J=1.13 Hz, 1 H) 7.83-7.94 (m, 2H) 8.05 (t, J=1.13 Hz, 1 H).

1. customthe reaction for 30 min
2. stirringThe mixture was stirred at room temperature for another 2 h
3. extractionthe product was extracted with CHCl3
4. customThe combined organic layer was dried
5. concentrationconcentrated
6. customThe product was purified by gradient silica gel chromatography