Highly Efficient Ultrasonic-Assisted CuCl-Catalyzed 1,3-Dipolar Cycloaddition Reactions in Water: Synthesis of Coumarin Derivatives Linked with 1,2,3-Triazole Moiety

By introducing ultrasound irradiation into on water CuCl-catalyzed 1,3-dipolar Huisgen cycloaddition, the reaction efficiencies were notably promoted toward a wide variety of applicable azides and alkynes at room temperature, and a series of coumarin derivatives linked with 1,2,3-triazole moiety were synthesized using the optimized conditions.