Two novel photochemical reactions of the ceph-3-em (9) have been discovered; in methanol, rearrangement to the 2-isopropenyl-1,3-thiazine (10) occurs whilst in tetrahydrofuran-acetone, regio- and stereo-specific addition leads to the tricyclic lactone (11).
N. K. Capps, G. M. Davies, P. B. Hitchcock and D. W. Young, J. Chem. Soc., Chem. Commun., 1985, 843 DOI: 10.1039/C39850000843
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