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2-bromo-6H-chromeno[4,3-b]quinolin-6-one[ No CAS ]
Yield
Reaction Conditions
Operation in experiment
With 1,3-dimethyl-2-imidazolidinone; at 230℃; for 1h;
Add anthranilic anhydride 1 (60 mg, 0.5 mmol) to a 15 mL tubeAnd 4-hydroxycoumarin 2g (0.65 mmol) followed by DMI (0.75 mL).The reaction mixture was warmed to 230 C for 1 hour. Stop heating,Cool to room temperature, add water and ethyl acetate. The organic phase is washed three times with water.The aqueous phases were combined and the water was extracted once with ethyl acetate.Finally, the organic phases were combined, dried over anhydrous sodium sulfate and evaporated.The residue was separated and purified by silica gel column chromatography.Obtaining product 3g and4g, the total yield is 66%,