The azanorbornenes (1) and (3) reacted with diphenylketene to give the 3-azabicyclo[4.3.0]-nonanones (7) and (5) respectively, while the spiro compound (9) afforded the cyclopentenol derivative (10) on reaction with the same ketene.
S. M. Roberts, C. Smith and R. J. Thomas, J. Chem. Soc., Perkin Trans. 1, 1990, 1493 DOI: 10.1039/P19900001493
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