ChemInform Abstract: Cycloadditions of 1,3,4‐Oxadiazin‐6‐ones (4,5‐Diaza‐α‐pyrones). Part 8. Conjugated and Non‐conjugated Cyclopentenones by a Reaction Cascade from Methyl 6‐Oxo‐5‐phenyl‐1,3,4‐oxadiazine‐2‐carboxylate and 1,3‐Butadienes.

Abstract Reaction of the title heterocycle (I) with 1,3‐butadienes such as (II) or (V) affords conjugated and/or non‐conjugated cyclopentenones such as (III), (IV), (VII) or (VIII) in a novel one‐pot procedure.