Abstract
The reaction of the imidate ester of methyl 7-acetamidoceph-3-em-4-carboxylate (2) and phenylacetyl chloride was followed by 13C n.m.r. spectroscopy, which disclosed the intermediacy of the adduct of (2) with the acyl chloride. Transacylations of methyl 7-([1-13C]acetamido)ceph-3-em-4-carboxylate (8) and methyl 7-{±)-5-benzamido-5-methoxycarbonyl[1-13C]valeramido}ceph-3-em-4-carboxylate (9) were also found to proceed through direct atack of the acyl chloride on the respective imidate ester.
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