Fe3O4@silica sulfuric acid nanoparticles: An efficient reusable nanomagnetic catalyst as potent solid acid for one-pot solvent-free synthesis of indazolo[2,1-b]phthalazine-triones and pyrazolo[1,2-b]phthalazine-diones

Synthesis and Characterization of Fe3O4@SiO2 NPs as an Effective Catalyst for the Synthesis of Tetrahydrobenzo[a]xanthen-11-ones

“…The nanostructures involving silica-coated magnetite nanoparticles (Fe 3 O 4 @SiO 2 core-shell nanoparticles) as catalyst with many reactive portions, acidic features and high surface area do not only supply high chemical stability but are also appropriate for the many functionalizations. 6,7 Recently, functionalized magnetite nanoparticles were used as efficient catalytic systems in many chemical transformations including synthesis of α-amino nitriles, 8 1,1-diacetates from aldehydes, 9 diazepine derivatives, 10 indazolo[2,1-b]phthalazine-triones and pyrazolo [1,2-b]phthalazine-diones, 11 3,4-dihydropyrimidin-2(1H)-ones, 12 2-amino-4H-chromen-4-yl phosphonates, 13 1,4-dihydropyridines 14 and pyrrole synthesis. 15 In addition, a series of organic reactions such as Knoevenagel condensation/Michael addition, 16 Suzuki/Heck cross-coupling, 17 asymmetric aldol reaction, 18 Suzuki coupling, 19 asymmetric hydrogenation of aromatic ketones, 20 acetalization reaction, 21 Ritter reaction, 22 23 Henry reaction, 24 enantioselective directaddition of terminal alkynes to imines 25 have been done using functionalized nanostructures.…”

Hyperactive Magnetically Separable Nano-sized MgFe2O4 Catalyst for the Synthesis of Several Five- and Six-Membered Heterocycles

“…FTIR spectra were recorded in KBr on a Schimadzu FTIR 8401 spectrometer and Perkin Elmer version 10.03.06 for the liquid samples. 1 H and 13 C spectra were recorded on a Bruker DRX 300 spectrometer operating at 300 MHz for 1 H NMR and 75 MHz for 13 C NMR as solutions in CDCl 3 and DMSOd 6 . The ESI mass spectra were measured on waters UPLC-TDQ spectrometer.…”

“…Researchers have reported striking novel catalytic properties including greatly enhanced reactivities and selectivities for nanocatalyst compared to bulk counter parts. Recently functionalized magnetic nano particle have been used as efficient catalytic system in many chemical transformation including synthesis of α-amino nitriles [10], 1-1 diacetates form aldehyde [11], diazepiene derivatives [12], indazalo [2,1-b] phthalazine triones, pyrazoles [1,2-b] phthalazine-diones [13], 3,4 dihydro pyrimidines-2(1H)ones [14], 1,4 dihydropyrimidines [15], and pyrrole synthesis [16]. Also a series of organic reaction such as Michael addition [17], Suzuki/Heck cross-coupling [18], asymmetric aldol reaction [19], Suzuki coupling [20], acetalization reaction [21], Ritter reaction [22], cyanosilylation of carbonyl compounds [23], Henry reaction [24], enantioselective direct addition of terminal alkynes to imines [25] have been done using functionalized nanostructure.…”

A novel poly(ethyleneoxide)-based magnetic nanocomposite catalyst for highly efficient multicomponent synthesis of pyran derivatives

“…Fe 3 O 4 magnetic nanoparticles (MNPs) were applied in reactions as catalyst or core of magnetic catalysts (26)(27)(28)(29)(30)(31)(32)(33). Magnetic nanoparticles can easily agglomerate and it decreases their reachable active sites.…”