Summary
The primary oxidation products of 2,3-dimethylquinoxaline with selenium dioxide are 3-methylquinoxaline-2-carbaldehyde, 1,3-dihydro-1,3-dihydroxyfuro[3,4-b]quinoxaline and quinoxaline-2-carboxylic acid. 3-Methylquinoxaline-2-carboxylic acid can be obtained in a second oxidation step only. 2,4-Dimethylquinazoline is dehydrogenated by selenium dioxide to the heterocyclic stilbene derivative8. Confirmation of structure of8 is given by NMR-spectroscopy.
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Kepez, M. Zur Oxydation von 2,3-Dimethylchinoxalin und 2,4-Dimethylchinazolin mit Selendioxid. Monatsh Chem 120, 127–130 (1989). https://doi.org/10.1007/BF00808754
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DOI: https://doi.org/10.1007/BF00808754