1,1'-Carbonyldiimidazole → 6-fluoro-5-(2-oxo-imidazolidin-1-yl)-3-(1H-pyrrol-2-yl)-1H-benzo[cd]indol-2-one

Participants

Reaction Steps

To a suspension of 5-(2-amino-ethylamino)-6-fluoro-3-(1H-pyrrol-2-yl)-1H-benzo[cd]indol-2-one (from Example 9 above) (31.1 mg, 0.1 mmol) in 1,2-dichloroethane (3 mL) was added 1,1′-carbonyldiimidazole (Aldrich, 162 mg, 1.0 mmol) at room temperature. The reaction mixture was heated under reflux overnight. The reaction was then quenched with saturated aqueous sodium bicarbonate solution (5 mL) and extracted with ethyl acetate (3×10 mL). The combined organic extracts were successively washed with water (5 mL) and brine (5 mL), dried over anhydrous sodium sulfate, filtered, and concentrated in vacuo. The crude product was triturated with ethyl acetate and hexanes, filtered, and dried to give 6-fluoro-5-(2-oxo-imidazolidin-1-yl)-3-(1H-pyrrol-2-yl)-1H-benzo[cd]indol-2-one as a yellow solid. (Yield 19.5 mg, 58.0%).

Provenance & Evidence