Photolysis of N-(ethoxycarbonyl)diazoacetyl-4,4-dimethyloxazolidine (2) gives as major product the oxa-penam ethyl (trans-5H,6H)-2,2-dimethyl-7-oxo-4-oxa-1-azabicyclo[3,2,0]heptane-6-carboxylate (1), the β-lactam function of which is cleaved readily by nucleophilic reagents.
B. T. Golding and D. R. Hall, J. Chem. Soc., Chem. Commun., 1973, 293 DOI: 10.1039/C39730000293
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