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The ionic liquid‐base N,N,2,2,6,6‐hexamethyl‐N‐(3‐(trimethoxysilyl)propyl)piperidin‐4‐amonium iodide was grafted onto titana‐coated NiFe2O4 nanoparticles for obtaining an efficient and reusable ionic liquid‐base hybrid nanocatalyst. The structure of hybrid nanoparticles was characterized using FT‐IR (Fourier‐transform infrared spectroscopy), field emission scanning electron microscopy, EDS (energy‐dispersive X‐ray spectroscopy), EDS map scan, Brunauer–Emmett–Teller surface area analysis, CHN (elemental analysis), vibrating sample magnetometer and thermogravimetric analysis techniques. Furthermore, this novel hybrid catalyst was used in one‐pot three‐component synthesis of 3‐amino‐1‐aryl‐5,10‐dioxo‐1H‐pyrazolo[1,2‐b]phthalazine‐2‐carbonitrile derivatives under green and environmentally benign conditions. This protocol avoids the use of harmful catalysts, toxic solvents and harsh reaction conditions. The products were synthesized in excellent yields within short reaction time and identified using elemental analysis, FT‐IR, 1H NMR and 13C NMR spectroscopies.

Organo-Sulfonic acid tags anchored on magnetic titana coated NiFe 2 O 4 nanoparticles (nano-NiFe 2 O 4 @TiO 2 -SiO 2 -Pr-DEA-OSO 3 H) was prepared and characterized by various analysis methods including Fourier transform infrared (FT-IR) spectroscopy, field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDS), vibrating sample magnetometer (VSM), X-ray diffraction (XRD) and thermo gravimetric analysis (TGA). These modified nanoparticles were used as efficient and recoverable hybrid nanocatalyst in multicomponent synthesis of some phthalazine-trione and benzo [4,5] imidazo[1,2-a]pyrimidine derivatives under green conditions. High yields within shorter reaction times, simple purification, and environmentally mild reaction conditions are some advantages of this protocol.atives through multicomponent reactions (MCRs) [28] under mild and green reaction conditions (Scheme 2). Results and Discussion Preparation and Characterization of novel MNPs catalystThe organoacid-decorated magnetic nanoparticles were prepared by five steps as depicted in Scheme 3. In summary NiFe 2 O 4 nanoparticles were easily prepared via the simple [a] M. Scheme 1. The synthetic pathway for preparation of 2H-indazolo[2, 1-b] phthalazine-triones.

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