Summary
Catalytic hydrogenation of 2,3-diphenyl-6-nitroquinoxaline led to the corresponding amine1 which in turn afforded products3a-i on reaction with alkoxymethylene derivatives2a-i. Thermal cyclization of3b and3f yielded substituted pyrazinoquinolones5b and5f, respectively. Optimal conditions for the successful hydrolysis of ester5b were found. The structures of all products were deduced from their IR, UV,1H, and13C NMR spectroscopic data.
Zusammenfassung
Katalytische Hydrierung von 2,3-Diphenyl-6-nitrochinoxalin ergibt das entsprechende Amin1, welches bei Reaktion mit den Alkoxymethylenderivaten2a-i zu den Produkten3a-i führt. Thermische Cyclisierung von3b und3f liefert die substituierten Pyrazinochinolone5b und5f. Für die Hydrolyse des Esters5b wurden optimale Bedingungen ermittelt. Die Strukturen aller Produkte wurden aus spektroskopischen Daten hergeleitet (IR, UV,1H- und13C-NMR).
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Dedicated to Prof.F. Sauter on the occasion of his 65th birthday
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Milata, V., Ilavsky, D., Chudík, M. et al. Gould-Jacobs reaction of 6-amino-2,3-diphenylquinoxaline. Monatsh Chem 126, 1349–1358 (1995). https://doi.org/10.1007/BF00807064
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DOI: https://doi.org/10.1007/BF00807064