Sulfamic‐Acid‐Functionalized Fe_3‐xTi_xO₄ Nanoparticles as Novel Magnetic Catalyst for the Synthesis of Hexahydroquinolines under Solvent‐Free Condition

Abstract

Sulfamic acid‐functionalized Fe3‐xTixO4 nanoparticles (Fe3‐xTixO4‐SO3H NPs) were fabricated as novel acidic magnetic nanocatalyst by the reaction of Fe3‐xTixO4 magnetic nanoparticles (MNPs) with 3‐chloropropyltrimethoxysilyl urea (TMSPU) followed by functionalization with chlorosulfonic acid. The structure of the synthesized nanocatalyst was studied using different methods including, Fourier‐transform infrared (FT‐IR), field‐emission scanning electron microscopy (FE‐SEM), transmission electron microscopy (TEM), powder X‐ray diffraction (XRD), energy‐dispersive X‐ray spectroscopy (EDX), thermogravimetric analysis (TGA), vibrating sample magnetometer (VSM), and dynamic light scattering (DLS). The potential catalytic ability of the synthesized MNPs was studied in one‐pot four‐component condensation reaction between aromatic aldehydes, dimedone, alkyl acetoacetates and ammonium acetate in order to synthesis of hexahydroquinoline derivatives. It was witnessed that the reactions proceeded smoothly under solvent‐free condition with high yields of corresponding hexahydroquinolines.

Sulfamic Acid as Versatile Green Catalyst Used For Synthetic Organic Chemistry: A Comprehensive Update

“…al. [115] recently prepared sulfamic acid-functionalized Fe 3-x Ti x O 4 nanoparticles which were modified with 3-(trimethoxysilyl)propyl urea (TMSPU; Figure 2). These nanoparticles were used for the synthesis of various hexahydroquinolines at 60°C, and 78-96 % yields were obtained in 5-20 min.…”

“…In an effort to address the objectives of green chemistry in the synthesis of hexahydroquinolines, Azarifar et. al [115] . recently prepared sulfamic acid‐functionalized Fe 3‐x Ti x O 4 nanoparticles which were modified with 3‐(trimethoxysilyl)propyl urea (TMSPU; Figure 2).…”

Amphiphilic Carbon Quantum Dots as a Bridge to a Pseudohomogeneous Catalyst for Selective Oxidative Cracking of Alkenes to Aldehydes: A Nonmetallic Oxidation System

“…This is since no other method with more efficiency has been found to be used as a reliable alternative method in oxidative cleavage applications in the industry. Therefore, it is imperative to develop new metal-free and sustainable oxidative cleavage systems as an alternative to traditional metal-based catalysts, which is in line with the criteria of green chemistry. , Surprisingly, the reports for such important reaction based on carbocatalysts are too rare. , …”

“…Therefore, it is imperative to develop new metal-free and sustainable oxidative cleavage systems as an alternative to traditional metal-based catalysts, which is in line with the criteria of green chemistry. 18,19 Surprisingly, the reports for such important reaction based on carbocatalysts are too rare. 20,21 To the best of our knowledge, only two studies have been carried out for the oxidative cleavage reaction of alkenes using metal-free carbocatalysts.…”

One‐pot synthesis of 1,4‐dihydropyridines and N‐arylquinolines in the presence of copper complex stabilized on MnFe2O4 (MFO) as a novel organic–inorganic hybrid material and magnetically retrievable catalyst

“…[15][16][17][18] These materials are also used as catalysts in organic chemistry because of their exceptional properties such as thermal stability, high surface area, high activity, low toxicity and ease of separation. [16,[18][19][20] Multicomponent reactions have been widely used in many research areas such as medicinal chemistry and modern organic synthesis because of time, energy and environment savings. Nitrogen-containing heterocyclic compounds such as dihydropyridines and N-arylquinolines have attracted much interest because of their numerous biological activities.…”