Abstract
The cephalosporin-type antibiotics Cephalexin, Cephradine and Cefadroxil have been prepared by coupling of their β-lactam nucleus and racemic amino acid side chain precursors. The initially obtained mixture of cephalosporin epimers is subjected to a clathration-induced asymmetric transformation which results in the epimerization of the epi-cephalosporin into the cephalosporin with the correct diastereomeric configuration.
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