George J. Kuster, Faysal Kalmoua, Hans W. Scheeren and Rene de Gelder
A high pressure promoted tandem [4 + 2]/[3 + 2] cycloaddition of β-nitrostyrene with a variety of enol ethers followed by a base catalysed rearrangement provided a novel class of di- and tricyclic N-oxy-β-lactam compounds.