The reaction of penicillanate esters with N-chloro-N-sodiourethane gave 6,6-diacylaminopenicillanates from which the corresponding 7,7-diacylaminodeacetoxycephalosporanates were prepared via the sulphoxides.
M. M. Campbell and G. Johnson, J. Chem. Soc., Chem. Commun., 1975, 479 DOI: 10.1039/C39750000479
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