Benzo[c]cinnoline N-acylimides (1) give the rearranged adducts (2) with diphenylketen; the ylide (6) can be intercepted in this reaction suggesting that the expected 1,3-diplor cycloadduct (5) is formed initially and rearranges to (2) both intramolecularly and by dissociation-recombination.
S. H. Alsop, J. J. Barr, R. C. Storr, A. F. Cameron and A. A. Freer, J. Chem. Soc., Chem. Commun., 1976, 888 DOI: 10.1039/C39760000888
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