Bis(4‐pyridylamino)triazine‐stabilized magnetite nanoparticles: preparation, characterization and application as a retrievable catalyst for the green synthesis of 4H‐pyran, 4H‐thiopyran and 1,4‐dihydropyridine derivatives

Abstract

Synthesis of bis(4‐pyridylamino)triazine stabilized on silica‐coated nano‐Fe3O4 particles, and their feasibility as a reusable heterogeneous basic catalyst are reported. The catalytic performance of this novel material was studied for the green synthesis of highly functionalized 4H‐pyran, 4H‐thiopyran and 1,4‐dihydropyridine derivatives via one‐pot multicomponent reactions. Eco‐friendly method, high yield and purity of desired products, short reaction time along with ease of workup procedure outline the advantages of these new methodologies over earlier ones. Surface and magnetic properties of the core–shell hybrid nanoparticles were characterized via transmission and scanning electron microscopies, X‐ray diffraction, energy‐dispersive X‐ray and Fourier transform infrared spectroscopies and vibrating sample magnetometry. Copyright © 2016 John Wiley & Sons, Ltd.

Hofmann N‐alkylation of aniline derivatives with alcohols using ferric perchlorate immobilized on SiO2 as a catalyst through Box–Behnken experimental design

“…In continuation of our studies of mild and green synthesis of heterocyclic compounds, [16][17][18][19][20] herein we report a new, efficient and environmentally friendly method for the synthesis of N-alkylated amines using Fe(ClO 4 ) 3 /SiO 2 as catalyst (Scheme 1).…”

(3‐Oxo‐[1,2,4]triazolidin‐1‐yl)bis (butane‐1‐sulfonic acid) functionalized magnetic γ‐Fe2O3 nanoparticles: A novel and heterogeneous nanocatalyst for one‐pot and efficient four‐component synthesis of novel spiro[indeno[1,2‐b]quinoxaline derivatives

“…Therefore, the use of them as a heterogeneous support has received increasing attention. [12][13][14] Nanoparticles such as γ-Fe 2 O 3 can be easily functionalized by linker groups which can fictionalized by a range of different organocatalysts. [6][7][8] One of the important and significant groups of nanomaterials is magnetic nanoparticles (MNPs), their applications are increased because they showed particular properties such as high surface areas and inhibit of the inevitable loss of solid catalysts in the separation process and tedious filtration or centrifugation recovery procedures, and also have been extensively investigated as inorganic supports in the synthesis of semi heterogeneous catalysts.…”

Immobilization of Palladium on Modified Nanoparticles and Its Catalytic Properties on Mizoroki‐Heck Reaction

“…Therefore, modified magnetite particles have been widely used for many organic reactions including C−C coupling reactions . Silica is the most common material as a preservation shell for coating MNPs, because of their unique advantages including preventing the aggregation of the Fe 3 O 4 nanoparticles . In this project, we supply modified MNPs to support palladium and it is used in Mizoroki‐Heck reaction and shows a high catalytic activity under aerobic conditions.…”