Abstract
Photolysis of N-diazoacetyloxazolidine compounds, 7c and 8c, afforded oxapenams, 9 and 10, respectively. The physical data of 9 and 10 along with their behavior on thinlayer chromatograms were consistent with that of the samples derived from clavulanic acid (1), a β-lactamase inhibitor, confirming their structures. Further, a methylene oxapenam 18 was obtained from an oxapenam 17 having a phenylseleno group by selenoxide elimination reaction.
