G. Procter et al., BETA-LACTAMS FROM TETRAHYDRO-1,2-OXAZINE-3,6-DIONES, AND A LABELING STUDY OF THE PRODUCT STEREOCHEMISTRY, Tetrahedron, 51(47), 1995, pp. 12837-12842
The stereochemistry of the N-C bond-forming step in the photochemical
conversion of a tetrahydro-1,2-oxazine-3,6-dione to a beta-lactam has
been shown to rake place with scrambling of stereochemistry using a de
uterium labelled precursor.