Several 4-pyrones bearing 3-alkoxy substituents have been photolysed in acetonitrile to give in two cases novel bicyclic oxazolines, arising from apparent Ritter-type capture of the intermediate oxyallyl zwitterion followed by intramolecular nitrilium trapping by alkoxide.
F. G. West and D. J. Koch, J. Chem. Soc., Chem. Commun., 1993, 1681 DOI: 10.1039/C39930001681
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