The reaction of 3-iminoprop-1-enylamines 1 with pentacarbonyl(1-methoxyprop-2-enylidene)chromium(0) complexes leads stereoselectively to substituted 5H-6,7-dihydroazepines in high yields; the process takes place at low temperature and is thought to involve a tandem imine cyclopropanation–Cope rearrangement.
J. Barluenga, M. Tomás, A. Ballestros, J. Santamaría and F. López-Ortiz, J. Chem. Soc., Chem. Commun., 1994, 321 DOI: 10.1039/C39940000321
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