Three-component synthesis of pyrano[2,3-d]pyrimidinone derivatives catalyzed by Ni2+ supported on hydroxyapatite-core–shell-γ-Fe2O3 nanoparticles in aqueous medium

Functionalization of superparamagnetic Fe3O4@SiO2nanoparticles with a Cu(II) binuclear Schiff base complex as an efficient and reusable nanomagnetic catalyst forN‐arylation of α‐amino acids and nitrogen‐containing heterocycles with aryl halides

“…[39][40][41] Also, this strategy provides an excellent opportunity for functionalization of the surface of silica shell and consequently immobilization of variety of organic compounds, transition metal complexes, and homogeneous catalysts on their surface. [42,43] In recent years, magnetic iron oxide core-shell nanocomposites prepared from Fe 3 O 4 and silica shell have been highly regarded due to their widespread applications in various fields [44] such as biomedicine [45][46][47][48][49][50][51][52][53][54][55][56][57][58] and environmental remediation data storage, [49] which all of these applications were not only thank to unique magnetic properties, biocompatibility and easy manipulation of Fe 3 O 4 NPs, but also they possess the both advantages of Fe 3 O 4 nanoparticle core (High aspect ratio, unique catalytic, magnetic and electrical properties) and ability to preparation of shells with different structures. [50] The Fe 3 O 4 NPs, whether alone [51] or supported, [52] have catalytic activity in order to coupling reactions.…”

Fe3O4@APTES@isatin-SO3H as heterogeneous and efficient catalyst for the synthesis of quinoxaline derivatives

“…Recently, the chemists have greatly focused on developing the eco-friendly catalysts and methods in the synthetic organic material and industrial fields [1,2].Over the last few decades, a growing research interest has been directed towards the preparation and application of highly efficient and recyclable catalysts in the modern synthetic processes [3][4][5][6].Magnetic Fe 3 O 4 nanoparticles have emerged as privileged support for immobilization of various functional groups such as phosphorous, nitrogen and organic moieties owing to the presence of high density hydroxyl groups on their surface, high surface area, high stability, facile magnetic separation, environmental benignity and high loading capacity [7][8][9][10][11][12][13][14][15][16][17][18]. Among the heterocyclic compounds, quinoxaline and derivatives are the most important compounds due to their biological and pharmacological properties which perform antifungal [19], insecticide [20], antibacterial [21], anticancer, antimalarial, anti-HIV [22] and antibiotics [23] activities.…”

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“…Accordingly, great deals of research have been actively dedicated to new routes for the synthesis of benzimidazoles [3]. So far, a number of methods and catalysts have been proposed for preparing the benzimidazoles, including H2O2/HCl and Cu(OTf)2 [4], Iodine [5], ZrCl4 [6], SnCl4 [7], TiCl4 [8], ZrOCl2.8H2O [9], Cu(OH)2 [10], Yb(OTf)3 [11], Na2S2O4 [12], phospho sulfonic acid [13], γ-Fe2O3@HAp-Fe 2+ NPs [14] and SnCl2.2H2O [15]. However, most of these methodologies suffer from particular disadvantages such as low yield, vigorous reaction conditions, high temperature requirement, long reaction time, high cost, highly acidic conditions, use of harmful solvents, the formation of by-products and toxic wastes, and tedious work-up.…”