N-Benzoylformyl α,β-unsaturated amides (1) underwent photochemical intramolecular [2 + 2]cyclo-addition to produce bicyclic imides, 1-phenyl-6-oxa-3-azabicyclo[3.1.1]pentane-2,4-diones (2), in good yield. Quantum yields for reaction of N-benzyl, N-(p-tolyl), and N-(2,6-xylyl)-N-benzoylformylmethacrylamide were 0.56, 0.04, and 0.10, respectively.
M. Sakamoto, H. Aoyama and Y. Omote, J. Chem. Soc., Perkin Trans. 1, 1986, 1759 DOI: 10.1039/P19860001759
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