Annelation of ketene S,N-acetals with 1,4-quinones is found to give benzo[b]- and naphtho[1,2-b]furans bearing enamine groups. Subsequent enamine reaction allows the formation of 1-benz- and naphtho[1,2-b]oxepines and benzofuran-2-ones.
H. Takahata, A. Anazawa, K. Moriyama and T. Yamazaki, J. Chem. Soc., Perkin Trans. 1, 1987, 1501 DOI: 10.1039/P19870001501
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