A tandem double annulation reaction of enaminones, generated in situ from alkyl amines and alkyl 2-butynoates as well as pent-3-yn-2-ones, with 1,3-dimethylalloxan affording functionalized oxazolidinedione spiro analoguesis described.Three of the four carbonyl groups of alloxan have been engaged through a tandem Michael addition, aldol-type condensation, and double intramolecular annulation sequences.
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