Abstract
AbstractN‐Heterocyclic carbene (NHC)‐catalyzed synthesis of highly functionalized pyrano[3,2‐c]chromene‐2,5‐dione derivatives, pyrano[3,2‐c]quinoline‐2,5(6 H)‐dione derivatives, and pyrano[4,3‐b]pyran‐2,5‐dione derivatives with potential biological activities is reported. The reaction occurs through a Knoevenagel condensation and NHC‐catalyzed enolate addition in one pot.
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