A novel synthesis of optically active (5R)-2-penem-3-carboxylates (1a–d)(same configuration as in natural penicillins) starting from the penicillanic acid derivative (3), is described.
M. Foglio, G. Franceschi, C. Scarafile and F. Arcamone, J. Chem. Soc., Chem. Commun., 1980, 70 DOI: 10.1039/C39800000070
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