Dichloromethane → 1-(diphenylmethyl)-7-fluoro-3-hydroxy-3-(7-hydroxy-2,3-dihydro-1,4-benzodioxin-6-yl)-1,3-dihydro-2H-indol-2-one

Participants

Reaction Conditions

Reaction Steps

To a cooled (0° C.) suspension of 2,3-dihydro-1,4-benzodioxin-6-ol (0.47 g, 3.0 mmol) in anhydrous tetrahydrofuran (12 mL) was added isopropylmagnesium chloride (2 M solution in tetrahydrofuran, 1.7 mL, 3.3 mmol). The reaction mixture was stirred at 0° C. for 1 h, and 7-fluoro-1-(diphenylmethyl)-1H-indole-2,3-dione (1.0 g, 3.0 mmol) and anhydrous dichloromethane (10 mL) were added. The reaction mixture was allowed to stir for 19 h at ambient temperature. The reaction mixture was concentrated in vacuo and was diluted with saturated aqueous ammonium chloride (30 mL) and ethyl acetate (30 mL). The phases were separated and the aqueous phase was extracted with ethyl acetate (2×50 mL). The combined organic extracts were washed with brine (100 mL), dried over anhydrous sodium sulfate, filtered and concentrated in vacuo. The crude product was purified by column chromatography and eluted with a 8% to 66% gradient of ethyl acetate in hexanes to afford 1-(diphenylmethyl)-7-fluoro-3-hydroxy-3-(7-hydroxy-2,3-dihydro-1,4-benzodioxin-6-yl)-1,3-dihydro-2H-indol-2-one (1.22 g, 84%) as an off-white solid: MS (ES+) m/z 475.0 (M−17).

Provenance & Evidence