Preparation and characterization of Fe₃O₄@SiO₂/APTPOSS core–shell composite nanomagnetics as a novel family of reusable catalysts and their application in the one‐pot synthesis of 1,3‐thiazolidin‐4‐one derivatives

Abstract

Octakis [3-(3-aminopropyltriethoxysilane)propyl]octasilsesquioxane (APTPOSS) as a polyhedral oligomeric silsesquioxane derivative was prepared and used as a pioneer reagent to obtain a novel core-shell composite using magnetic iron oxide nanoparticles as the core and the inorganic-organic hybrid polyhedral oligomeric silsesquioxane as the shell. Fe 3 O 4 @SiO 2 /APTPOSS were confirmed using Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive spectroscopy, dynamic light scattering, thermogravimetric analysis, X-ray diffraction and vibrating sample magnetometry. The inorganic-organic hybrid polyhedral oligomeric silsesquioxane magnetic nanoparticles were used as an efficient new heterogeneous catalyst for the onepot three-component synthesis of 1,3-thiazolidin-4-ones under solvent-free conditions. Moreover, these nanoparticles could be easily separated using an external magnet and then reused several times without significant loss of catalytic activity. Copyright

Synthesis of tetramethylquinoline‐2,4‐diamine using FeNi3/KCC‐1/APTPOSS‐supported copper cyclam and salen complex as a reusable catalyst

“…[30] 2.6 | General Procedure for Preparation of FeNi 3 /KCC-1/APTPOSS MNPs A beaker was used to mix FeNi 3 /KCC-1 MNPs (2 mmol) and tetrahydrofuran (THF; 20 ml) together; then, ultrasonication was applied to disperse NaH (20 mmol) in the mixture. Next, in order to cool the mixture, room temperature was maintained; finally, the solution was filtered and methanol and acetone were used to wash the solution.…”

“…Next, in order to cool the mixture, room temperature was maintained; finally, the solution was filtered and methanol and acetone were used to wash the solution. [30]…”

MNPs‐NHC6H4SO3H as high‐performance catalyst for the synthesis of 1,4‐diazepines containing tetrazole ring under microwave irradiation

“…Despite the availability of these methods, there remains enough scope for an efficient and reusable catalyst with high catalytic activity to achieve such systems. In our continuing effort toward the development of efficient and environmentally benign magnetic nanocatalysts, MNPs‐NHC 6 H 4 SO 3 H was prepared by a simple method as a highly efficient acid magnetic catalyst. In order to investigate the catalytic activity of this magnetic catalyst, one‐pot synthesis of 1,4‐diazepines containing the tetrazole ring via a four‐component reaction was performed under microwave irradiation (Scheme ).…”

“…[22,23] Despite the availability of these methods, there remains enough scope for an efficient and reusable catalyst with high catalytic activity to achieve such systems. In our continuing effort toward the development of efficient and environmentally benign magnetic nanocatalysts, [24][25][26][27] Figure S1. The XRD patterns indicate that the three products (Figure S1a-c) show similar diffraction peaks, indicating that the coating agent does not significantly affect the crystal structure of the magnetite nanoparticles.…”

Sonochemical synthesis of chromenes catalyzed by L-phenyl alanine-attached nano-Fe3O4@SiO2

“…The ultrasound approach offers several advantages such as higher yields, enhanced organic reaction rates, milder reaction conditions, and waste minimization compared with traditional methods and saving money and energy. Compared to conventional heating which provides thermal energy in the macro system, ultrasound irradiation is able to activate many organic reactions by providing the activation energy in micro environment (27)(28)(29)(30)(31)(32). Herein we report an efficient method for synthesize of L-phenyl alanine-supported Fe 3 O 4 @SiO 2 core/shell MNPs as an efficient catalyst for the preparation of 10,10-dimethyl-7-(phenyl)-10,11-dihydrochromeno [4,3-b]chromene-6,8(7H,9H )-diones by one-pot condensation of aldehydes, dimedone and 4-hydroxy coumarin under ultrasonic irradiation (Scheme 1).…”