Abstract
AbstractA new method is proposed for the synthesis of pyrido[3,4-c]cinnolines and pyrido[3,2-c]cinnolines. Pyridine-3-diazonium tetrafluoroborates, containing donor methoxy groups in one of the aryl substituents, form pyridocinnolines at 0 °C by intramolecular azo coupling reaction. The 2′-methoxy group in the aryl substituent of the pyridine-3-diazonium salt participates in the aromatic nucleophilic substitution reaction, which results in the elimination of the diazo group to form benzofuro[2,3-c]pyridine and benzofuro[3,2-b]pyridine. The intermediate and target reaction products were isolated in high yields.
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