Abstract
AbstractA tandem double-annulation reaction of 1,3-dimethylalloxan with enaminones, generated in situ from alkyl amines and alkyl but-2-ynoates or pent-3-yn-2-ones to give functionalized oxazolidinedione spiro analogues is described. Three of the four carbonyl groups of alloxan have been engaged through a tandem Michael addition, aldol-type condensation, and double intramolecular annulation sequence.
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