Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... Departamento de Química Orgánica. Colegio Universitario de Alava. Vitoria. Spain. ... Baeyer-Villiger oxidation of azetidine-2,3-diones provides a new route to α-aminoacid-N-carboxyanhydrides . Conversion of azetidine-2,3-diones into 3-acetyl-β-lactams is also described.