Synthesis of dihydroquinazolinone and octahydroquinazolinone and benzimidazoloquinazolinone derivatives catalyzed by an efficient magnetically recoverable GO-based nanocomposite

Gallic acid grafted to amine‐functionalized magnetic nanoparticles as a proficient catalyst for environmentally friendly synthesis of α‐aminonitriles

“…The pattern reaction was carried out with the best yield using Fe 3 O 4 @SiO 2 -NH 2 -GA as a catalyst in comparison with gained catalysts from previous fabrication levels ( Table 1, entries 1-4; see also results of some reported procedures for further comparisonentries 6-9). Solvent screening revealed that the reaction performed well in EtOH compared with other suggested solvents with different polarities under identical conditions (entries 5 and [11][12][13][14]. To find the best reaction conditions, a set of experiments was carried out by changing the catalyst amount.…”

“…It is widely acknowledged that there is a growing need for more environmentally acceptable processes and catalysts in the chemical industry. This trend has become known as green chemistry or sustainable technology . Surface functionalization of magnetic nanoparticles (MNPs) is a well‐designed way to bridge the gap between heterogeneous and homogeneous catalysis.…”

“…This trend has become known as green chemistry or sustainable technology. [14,15] Surface functionalization of magnetic nanoparticles (MNPs) is a well-designed way to bridge the gap between heterogeneous and homogeneous catalysis. The introduction of MNPs in a variety of solid matrices allows the combination of well-known procedures for catalyst heterogenization with techniques for magnetic separation.…”

“…These powerful silica-based magnetically recoverable nanocatalysts have the following attractive features: (1) good dispersion of the active species (usually noble metal NPs) on the magnetic support; (2) sufficient binding strength between the active species and magnetic support to enable recycling; (3) good chemical inertness of the magnetic support; (4) high saturation magnetization to facilitate magnetic separation; (5) soft ferromagnetism for redispersion; (6) a wide variety of silylating agents can be used, allowing pendant functional groups in the inorganic framework; (7) attachment is easier on silica surfaces than on organic polymeric supports (which have a high number of cross-linking bonds); (8) low cost, ready availability, mechanical robustness and straightforward synthesis; and (9) a quasi-homogeneous state can be achieved. [14] Gallic acid (GA) is a yellowish white crystal having a molecular mass of 170.12 g mol −1 , melting point 250°C and water solubility 1.1% at 20°C. [27] It is a natural plant triphenol, and its derivatives have been extensively evaluated for their antitumor activity against a variety of cell lineages.…”

Fe3O4@BNPs‐CPTMS‐Chitosan‐Pd(0) as an Efficient and Stable Heterogeneous Magnetic Nanocatalyst for the Chemoselective Oxidation of Alcohols and Homoselective Synthesis of 5‐Subestituted 1H‐Tetrazoles

“…The traditional method for the preparation of 5‐substituted 1 H ‐tetrazoles derivatives involves the cycloaddition of [2+3] of azides and nitriles. So far, various methods have been reported using various starting materials for the synthesis of tetrazole‐containing compounds and oxidation of alcohols using heterogeneous catalysts, in which case magnetic catalysts are important …”