Demonstrating their reactivity as 1,3-dipoles in cycloaddition reactions, quinoxalin-3(4H)-one 1-N-oxide (3a) and its N-methyl derivative (3b) react with the aryl isocyanates (4a and b) to give the corresponding 2-arylaminoquinoxalin-3(4H)-ones (6a–c); similarly, reaction with benzyne affords the 2-(o-hydroxyphenyl)-quinoxalin-3(4H)-ones (9a and b).
J. C. Mason and G. Tennant, J. Chem. Soc., Chem. Commun., 1972, 218 DOI: 10.1039/C39720000218
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