The preparation of penicillin-2-carboxylate systems and their conversion via a decarboxylative Pummerer reaction into the 2-methylene penam and 2-methyl penem systems is reported.
J. E. Baldwin, A. K. Forrest, S. Ko and L. N. Sheppard, J. Chem. Soc., Chem. Commun., 1987, 81 DOI: 10.1039/C39870000081
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