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The combined action of orthoformate and aniline upon 4-hydroxy-coumarin yields anilinomethylene chromon-2,4-dione, which reacts with ethyl cyanoacetate in DMF in the presence of KOH to give the pyronocoumarine (6a). Pyronoquinolones are obtained in a similar way.doi:10.1515/znb-1976-0423 fatcat:tdppy5h5abfevbn6l4jxtgq6lq