The title compound 2 is found to undergo thermal isomerization into the quinoxaline derivative 3, as shown by a crystal structure determination of the latter; a mechanistic rationale for this unusual rearrangement is suggested.
R. Nesi, D. Giomi, S. Papaleo, P. Dapporto and P. Paoli, J. Chem. Soc., Chem. Commun., 1990, 1675 DOI: 10.1039/C39900001675
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