Furan, 2,5-dimethylfuran, and cyclopentadiene add to the nitroso- and azo-alkenes (1) and (2) to give the oxazine and pyridazine derivatives (3) and (4); a mechanism involving Diels-Alder addition followed by rapid [3,3] rearrangement is proposed.
R. Faragher and T. L. Gilchrist, J. Chem. Soc., Chem. Commun., 1976, 581 DOI: 10.1039/C39760000581
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