Recyclable Polymer Supported DMAP Catalyzed Cascade Synthesis of α‑Pyrones

Abstract

Polymer-supported catalysts have emerged as one of the sustainable and cost-effective alternatives in organic synthetic chemistry. We have developed the first polymer-supported DMAP catalyzed one-pot synthesis of diversely substituted α-pyrones. The cascade approach involves C5 conjugate addition of 5H-oxazol-4-ones to α,β-unsaturated-β-ketoesters followed by lactonization/elimination