The β-lactams prepared from penta-1,4-diene and cyclohexa-1,4-diene by reaction with chlorosulphonyl isocyanate can be readily converted into the 7-oxo-1-azabicyclo[3.2.0]hept-2-ene ring system, using an intramolecular Witting reaction to form the 2,3-double bond.
A. J. G. Baxter, K. H. Dickinson, P. M. Roberts, T. C. Smale and R. Southgate, J. Chem. Soc., Chem. Commun., 1979, 236 DOI: 10.1039/C39790000236
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