反应详情

温度

0 °C

To a stirred solution of 4-chloroisatin (9.10 g, 50.0 mmol) in N,N-dimethylformamide (100 mL) was added sodium hydride (2.20 g, 55.0 mmol) at 0° C. The reaction mixture was stirred at 0° C. for 1 h, followed by the addition of bromodiphenylmethane (14.80 g, 56.8 mmol). The mixture was stirred at ambient temperature for 20 h, diluted with ethyl acetate, washed with water and brine, dried over anhydrous sodium sulfate and filtered. The filtrate was concentrated in vacuo. The residue was recrystallized from diethyl ether and hexanes to afford 4-chloro-1-(diphenylmethyl)-1H-indole-2,3-dione (14.20 g, 81%): 1H NMR (300 MHz, CDCl3) δ 7.37-7.17 (m, 11H), 6.98-6.95 (m, 2H), 6.42 (d, J=9.0 Hz, 1H); MS (ES+) m/z 369.9 (M+23), 371.9 (M+1).

1. stirringThe mixture was stirred at ambient temperature for 20 h
2. washwashed with water and brine
3. dry with materialdried over anhydrous sodium sulfate
4. filtrationfiltered
5. concentrationThe filtrate was concentrated in vacuo
6. customThe residue was recrystallized from diethyl ether and hexanes