Sodium hydride → [2-[6-fluoro-2-oxo-3-(1H-pyrrol-2-yl)-1,2-dihydro-benzo[cd]indol-5-yloxy]-ethyl]-carbamic acid tert-butyl ester

Participants

Reaction Steps

To a suspension of (Z)-5-fluoro-4-[1-iodo-3-oxo-3-(1H-pyrrol-2-yl)-propenyl]-1,3-dihydro-indol-2-one (from Example 8 above) (79.2 mg, 0.2 mmol) in tert-butyl N-(2-hydroxyethyl)-carbamate (Aldrich, 3 mL, 18.9 mmol) was added NaH (Aldrich, 60%, 0.2 g, 5.0 mmol) in portions at room temperature. After stirring at room temperature for 30 minutes, the reaction mixture was heated to 120° C. for 3.0 hours. The reaction was quenched by pouring the reaction mixture into an ice-cold saturated aqueous ammonium chloride solution (20 mL) and extracted with ethyl acetate (3×30 mL). The combined organic extracts were successively washed with water (10 mL) and brine (10 mL), dried over anhydrous sodium sulfate, filtered, and concentrated in vacuo. The crude product was purified by flash chromatography (silica gel, 50% ethyl acetate in hexanes) to give [2-[6-fluoro-2-oxo-3-(1H-pyrrol-2-yl)-1,2-dihydro-benzo[cd]indol-5-yloxy]-ethyl]-carbamic acid tert-butyl ester as a yellow solid. (Yield 17.7 mg, 21.5%).

Provenance & Evidence