1,4-Dihydroxyanthraquinone-copper(II) nanoparticles immobilized on silica gel: a highly efficient, copper scavenger and recyclable heterogeneous nanocatalyst for a click approach to the three-component synthesis of 1,2,3-triazole derivatives in water

CoFe2O4/Cu(OH)2 magnetic nanocomposite: an efficient and reusable heterogeneous catalyst for one-pot synthesis of β-hydroxy-1,4-disubstituted-1,2,3-triazoles from epoxides

“…13 The Huisgen 1,3-dipolar cycloaddition of alkynes and organic azides has been developed as the principal method for synthesis of 1,2,3-triazoles. [14][15][16][17][18][19][20][21][22] Recently, multicomponent onepot synthesis of b-hydroxy-1,2,3-triazoles has been carried out through in situ click reaction of azides, alkynes and epoxides in the presence of heterogeneous copper catalysts such as carbon supported copper nanoparticles, 23,24 porphyrinatocopper nanoparticles, 25 CuSO 4 $5H 2 O/sodium ascorbate, 26 copper(I)-zeolite, 27 Cu[N 2 ,N 6 -bis(2-hydroxyphenyl)pyridine-2,6-dicarboxamidate]/ ascorbic acid, 28 copper ferrite nanoparticles, 29 copper(I)@phosphorated SiO 2 , 30 Cu(OAc) 2 $H 2 O, 31 (Cu/Cu 2 O) nanoparticles, 32 Cu(II)-azide complexes, 33 Cu(II)-DA@nano AlPO 4 , 34 1,4-dihydroxyanthraquinone-copper(II) nanoparticles immobilized on silica gel, 35 4 0 -phenyl-2,2 0 :6 0 ,2 00 -terpyridine copper(II) complex immobilized on activated multiwalled carbon nanotubes, 36 CuI 37 and NiFe 2 O 4 -glutamate-Cu. 38 Ramachary-Bressy-Wang cycloaddition of enolate intermediates and organic azides is the other basic method for one-pot preparation of 1,4-disubstituted-1,2,3-triazoles.…”

Design of a graphene oxide-SnO2 nanocomposite with superior catalytic efficiency for the synthesis of β-enaminones and β-enaminoesters

“…The conventional synthesis protocols used for benaminones and b-enaminoesters involved condensation of carbonyl compounds with amines catalyzed by chlorides, 17,18 metal oxides, 19 aurates, 20 SiO 2 and it's composite, 16,[21][22][23] ionic liquids, 24 and triates. 41,42 In order to meet these requirements, supported metal oxide nanocomposites are found to be preferable materials as solid-state catalysts owing to their nanometric size that contributes to the dramatic increase in their surface area. [28][29][30] The basic drawbacks which the previous reaction strategies undergo include requirements for particular reaction environment, 25 hygroscopic triate precursors, 25,27 use of homogeneous catalyst, [31][32][33] formation of side products, requirement of extended reaction time, 34,35 non-reusability of the catalyst, 33 use of expensive reagents, 36,37 and use of toxic reagents and solvents.…”

Eco‐compatible three component strategies for C‐S bond formation in thioether and S‐aryl‐carbamodithioate compounds catalyzed by copper(II) nanoparticles supported on modified AlPO4

“…In the next step, ( C ) was attached to AlPO 4 support in ethanol under reflux condition for three days. Finally, AlPO 4 supported Cu(II) complex of 1,4‐dihydroxyanthraquinone was prepared by the reaction of supported ligand and Cu(OAc) 2 in ethanol at room temperature (Scheme ) . The resulting nano‐catalyst was characterized using various characterization techniques such as SEM, TEM, AFM, XRD, FT‐IR, UV–Vis, CV, BET, TGA, ICP and XPS.…”