Anion-cation Co-operative Catalysis by Artificial Sweetener Saccharine-based Ionic Liquid for Sustainable Synthesis of 3,4-dihydropyrano[]chromenes, 4,5-dihydropyrano[4,3-]pyran and Tetrahydrobenzo[]pyrans in Aqueous Medium
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In this study, a saccharine-based ionic liquid [Bmim]Sac has been found to be a sustainable catalyst for the synthesis of 3,4-dihydropyrano[]chromenes, 4,5-dihydropyrano[4,3-]pyran and tetrahydrobenzo[]pyrans scaffolds through Domino Knoevenagel-Michael reaction. The easy recovery of the catalyst and high yield of the products make the protocol attractive, sustainable and economical. A mechanistic hypothesis is discussed using the concept of cooperative catalysis based on the dual (electrophilic/nucleophilic) activation of reactants by [Bmim]Sac. Furthermore, dual hydrogen bonding of saccharinate anions plays an important role in the activation of nucleophiles.
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