反应详情

To a solution of (4′-bromo-5,6-difluoro-2′-oxospiro[1-benzofuran-3,3′-indol]-1′(2′H)-yl)acetic acid (0.24 g, 0.59 mmol) and oxalyl chloride (0.15 mL, 1.76 mmol) in toluene (7.00 mL) was added one drop of DMF and the resulted mixture was stirred at ambient temperature overnight. The mixture was concentrated under vacuum. The residue was dissolved in dichloromethane (5.00 mL) and 2-fluoroaniline (0.18 mL, 1.89 mmol) was added at ambient temperature. The mixture was stirred at ambient temperature for one hour. More dichloromethane (100 mL) was added. The organic layer was washed with water, dried over anhydrous sodium sulfate and filtered. The filtrate was concentrated in vacuo. The residue was subjected to column chromatography (ethyl acetate/hexane, 1/5) to give the title compound (0.23 g, 76%): 1H NMR (300 MHz, CDCl3) δ 8.20 (t, 1H), 7.80 (br, 1H), 7.27-7.17 (m, 2H), 7.16-7.03 (m, 3H), 6.97-6.88 (m, 1H), 6.78-6.60 (m, 2H), 5.08 (d, 1H), 4.93 (d, 1H), 4.68 (d, 1H), 4.49 (d, 1H); 13C NMR (75 MHz, CDCl3) δ 177.1, 163.9, 157.8, 143.6, 131.0, 128.8, 128.1, 124.7, 121.8, 120.0, 115.0, 111.6, 108.1, 99.8, 77.5, 59.2, 44.7; MS (ES+) m/z 503.4 (M+1), 505.4 (M+1).

1. concentrationThe mixture was concentrated under vacuum
2. dissolutionThe residue was dissolved in dichloromethane (5.00 mL)
3. stirringThe mixture was stirred at ambient temperature for one hour
4. washThe organic layer was washed with water
5. dry with materialdried over anhydrous sodium sulfate
6. filtrationfiltered
7. concentrationThe filtrate was concentrated in vacuo