Selective synthesis of pyridazine-fused chromones and 3-pyridazinyl chromones through intermolecular chromone annulation of o -hydroxyphenylenaminones with aryldiazonium salts

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A chemodivergent and skeleton-controllable annulation reactions of readily available o -HPEs and aryldiazonium salts was described for the synthesis of highly functionalized pyridazine-fused chromones with high antiviral activity and higher safety.