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Zur Reaktivität von C=N-Doppelbindungssystemen, VII. Synthesen von fluoreszierenden pyronokondensierten Heterocyclen / The Reactivity of the C=N-Double Bond Systems, VII. Syntheses of Condensed Pyronoheterocycles
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1976
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Combinatorial ChemistryDerivative (Chemistry)EngineeringCombined ActionHeterocyclicOrganic Chemistry4-Hydroxy-coumarin YieldsC=n-double Bond SystemsChemistryHeterocycle ChemistryPharmacologyEthyl CyanoacetateSynthetic ChemistryBiomolecular EngineeringCondensed Pyronoheterocycles
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.