Treatment of the 7-phthalimido-3-methyl-ceph-3-em-4-carboxylate (1) and 6-phthalimido-penicillins (4) with t-butyl perbenzoate in the presence of copper(I) chlride gave compounds bearing a benzoyloxy substitutent at the ring junction of the fused β-lactam rings, (2) and (5) respectively.
H. Matsumura, T. Yano, M. Ueyama, K. Tori and W. Nagata, J. Chem. Soc., Chem. Commun., 1979, 485 DOI: 10.1039/C39790000485
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