反应详情

温度

0 °C

To a solution of sesamol (7.32 g, 53.1 mmol) in anhydrous tetrahydrofuran (150 mL) were added a solution of isopropylmagnesium chloride (2.0 M in tetrahydrofuran, 30.1 mL, 60.2 mmol) at 0° C. under nitrogen. The reaction mixture was stirred at 0° C. for 30 min, followed by the addition of 7-bromo isatin (8.0 g, 35.4 mmol). The suspended mixture was stirred at ambient temperature for 16 h. The reaction mixture was diluted with a saturated aqueous solution of ammonium chloride (300 mL) and ethyl acetate (250 mL), and the phases were separated. The aqueous phase was extracted with ethyl acetate (200 mL), and the combined organic solution was washed with brine (100 mL), dried over anhydrous sodium sulfate, filtered and concentrated in vacuo. The crude solid was triturated with diethyl ether, filtered and dried under the reduced pressure to afford 7-bromo-3-hydroxy-3-(6-hydroxy-1,3-benzodioxol-5-yl)-1,3-dihydro-2H-indol-2-one (9.8 g, 77%) as a light yellow solid: 1H NMR (300 MHz, DMSO-d6) δ10.64 (s, 1H), 9.18 (s, 1H), 7.33 (dd, J=7.8, 1.4 Hz, 1H), 7.21 (s, 1H), 6.84-6.75 (m, 2H), 6.54 (s, 1H), 6.21 (s, 1H), 5.92 (dd, J=6.1, 0.8 Hz, 2H); MS (ES+) m/z 363.8 (M+1), 365.8 (M+1).

1. stirringThe suspended mixture was stirred at ambient temperature for 16 h
2. customthe phases were separated
3. extractionThe aqueous phase was extracted with ethyl acetate (200 mL)
4. washthe combined organic solution was washed with brine (100 mL)
5. dry with materialdried over anhydrous sodium sulfate
6. filtrationfiltered
7. concentrationconcentrated in vacuo
8. customThe crude solid was triturated with diethyl ether
9. filtrationfiltered
10. customdried under the reduced pressure