Fe3O4@Boehmite-NH2-CoII NPs: An Environment Friendly Nanocatalyst for Solvent Free Synthesis of Coumarin Derivatives Through Pechmann Condensation Reaction

Abstract

We report herein the synthesis of coumarin derivatives via the Pechmann condensation reaction in the presence of magnetic core–shell-like Fe3O4@Boehmite-NH2-CoII NPs. The aforesaid nanocatalyst which previously reported by our group, was found to be an efficient heterogeneous nanocatalyst in this reaction. Initially, the reaction conditions were optimized with different solvents, catalyst amounts and temperatures. Subsequently, the scope of the reaction was extended and the coumarin derivatives were obtained in reasonable yields. Interestingly, Fe3O4@Boehmite-NH2-CoII NPs was stable under reaction conditions and can be reused at least six times without a significant decrease in its catalytic activity. More importantly, using cobalt as a non-toxic, inexpensive, widely available and high-activity catalyst is great of interest than the most previously reported protocols.