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A novel sulfated tungstate catalyzed synthesis of 3-functionalized coumarins from substituted salicylaldehydes and β-ketoesters under solvent-free conditions described. The library of 3-acyl coumarin products obtained in excellent yield by employing substituted salicylaldehydes and β-ketoesters under optimal reaction conditions. This new method has numerous merits such as using green and nontoxic catalyst, displaying broad substrate scope, shorter reaction time, excellent yield, functional group compatibility, operational simplicity, and outstanding catalyst recyclability.

Sulfated Tungstate as a Heterogeneous Catalyst for Synthesis of 3-Functionalized Coumarins under Solvent-Free Conditions