Synthesis of Functionalized-Magnetic Nanoparticles and Application as a Retrievable and Efficient Catalyst for the Green Synthesis of Pyrano[2,3-<i>c</i>]Phenazine-15-yl)Methanone Derivatives Under Solvent-Free Conditions

A novel method for the synthesis of four-component pyrano[2,3-<i>c</i>]phenazin-15-yl) methanone derivatives has been developed <i>via</i> condensation/Knoevenagel/Michael in the presence of Fe₃O₄@ZnO-SO₃H as a recyclable heterogeneous catalyst under Solvent-Free Conditions, using microwave irradiation. This green process has many advantages such as high productivity, shorter reaction times, environmentally friendly, quick isolation, and prevention of hazardous solvents in the laboratory for the synthesis of pyrano[2,3-<i>c</i>]phenazin-15-yl)methanone derivatives, which are promising compounds in various aspects of medical sciences (pharmacy).