A Simple, Efficient and Environmentally Benign Synthetic Protocol for the Synthesis of Spirooxindoles Using Choline Chloride-Oxalic Acid Eutectic Mixture as Catalyst/Solvent System
efficient catalyst and environmentallybenign reaction medium. The present protocol offers several advantages such as operational simplicity with easy workup, shorter reaction times excellent yields with superior atom economy and environmentallybenign reaction conditions with the use of cost-effective, recyclable, non-toxic and bio-degradable DES as catalyst/solvent.