Benzo[c]cinnolinium-5-(N-acylimides)(6; R = Ph, OEt, or Me) give benzo[c]cinnoline and 2-substituted-4,5-diphenyloxazin-6-ones (7) on reaction with diphenylcyclopropenone. In contrast, the related benzo[c]cinnolinium-5-(N-benzimidoimides)(11; R = H, Ph, or p-tolyl) give stable adducts (12), which on pyrolysis yield benzo[c] cinnoline and 1-substituted-2,5,6-triphenylpyrimidin-4-ones.
J. J. Barr, R. C. Storr and V. K. Tandon, J. Chem. Soc., Perkin Trans. 1, 1980, 1147 DOI: 10.1039/P19800001147
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