Two new photochemical reactions of the ceph-3-em 4 have been discovered. In methanol, rearrangement to the 2-isopropenyl-6-methoxy-4-oxotetrahydro-1,3-thiazine 14 occurs, whilst in tetrahydrofuran–acetone, regio- and stereo-specific addition leads to the tricyclic lactone 25.
N. K. Capps, G. M. Davies, P. B. Hitchcock and D. W. Young, J. Chem. Soc., Perkin Trans. 1, 1992, 763 DOI: 10.1039/P19920000763
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