Sodium Z-3-benzylidene-7-oxo-4-oxa-1-azabicyclo[3.2.0]heptane-2-carboxylate (1b), a novel clavulanic acid analogue, has been prepared via the isomerisation of the bicycloheptane (2a).
P. H. Bentley, G. Brooks, M. L. Gilpin and E. Hunt, J. Chem. Soc., Chem. Commun., 1977, 905b DOI: 10.1039/C3977000905B
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