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温度

0 °C

To a solution of 2,2-difluoro-1,3-benzodioxol-5-ol (Jacobus et al., WO 2004/4048320) (1.15 g, 6.60 mmol) in anhydrous tetrahydrofuran at 0° C. was added isopropylmagnesium chloride (2 M solution in tetrahydrofuran, 3.3 mL, 6.6 mmol). The reaction mixture was stirred at 0° C. for 0.5 h and 1-{[5-(trifluoromethyl)furan-2-yl]methyl}-1H-indole-2,3-dione (1.95 g, 6.60 mmol) was added. The reaction mixture was allowed to warm to ambient temperature and stirred for 96 h. A saturated aqueous solution of ammonium chloride (30 mL) was added and the mixture was extracted with ethyl acetate (3×30 mL). The combined organic extracts were washed with brine (2×30 mL), dried over anhydrous sodium sulfate, filtered and concentrated in vacuo. Purification of the residue by column chromatography eluted with a 0% to 35% gradient of ethyl acetate in hexanes afforded 3-(2,2-difluoro-6-hydroxy-1,3-benzodioxol-5-yl)-3-hydroxy-1-{[5-(trifluoromethyl)furan-2-yl]methyl}-1,3-dihydro-2H-indol-2-one (2.54 g, 73%) as a pale orange solid: MS (ES+) 451.3 (M−17).

1. temperatureto warm to ambient temperature
2. stirringstirred for 96 h
3. extractionthe mixture was extracted with ethyl acetate (3×30 mL)
4. washThe combined organic extracts were washed with brine (2×30 mL)
5. dry with materialdried over anhydrous sodium sulfate
6. filtrationfiltered
7. concentrationconcentrated in vacuo
8. customPurification of the residue by column chromatography
9. washeluted with a 0% to 35% gradient of ethyl acetate in hexanes