Abstract
The reaction of benzofuran-2,3-dione derivatives with dialkyl acetylenedicarboxylates and alkyl isocyanides results in a three-component addition reaction in which the ester carbonyl group is incorporated into a two-atom assembling unit to give highly functionalized γ-spiroiminolactones in good yield. This reaction provides the first example of an ester carbonyl group participating in an isocyanide-based multicomponent reaction.
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