Heating of allylic amide or allylic ester substituted diene–Fe(CO)3 complexes such as (7) and (10)(140 °C) results in an intramolecular coupling of the pendant double bond with the diene moiety to give spirolactam and spirolactone derivatives; the stereochemical course of this reaction was established by an X-ray crystal structure determination of the lactone derivative (11).
A. J. Pearson, M. Zettler and A. A. Pinkerton, J. Chem. Soc., Chem. Commun., 1987, 264 DOI: 10.1039/C39870000264
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