Ultrasonic-assisted green synthesis of β-amino carbonyl compounds by copper oxide nanoparticles decorated phosphate functionalized graphene oxide via Mannich reaction

Synergistic Catalysis by Copper Oxide/Graphene Oxide Nanocomposites: A Facile Approach to Prepare Quinazolines and Quinazoline Containing Triazole/Tetrazole Moieties under Mild Reaction Conditions

“…The Cu 2p XPS spectrum (Figure 5d) of CuO/GO nanocomposite shows two bands at 934.6 and 954.5 eV, which are associated to the bonding energy of Cu 2p 3/2 and Cu 2p 1/2 , respectively. Additionally, two satellite peaks observed at 943.8 and 963.3 eV corresponds to Cu 2p 3/2 and Cu 2p 1/2 , suggesting the presence of Cu +2 in the prepared catalyst and hence the formation of CuO is confirmed [51,53] …”

Facile design of a WO3 nanorod-decorated graphene oxide 1D–2D nanocatalyst for the synthesis of quinoline and its derivatives

“…67 This may be due to the interaction of the pyridine with the Brønsted acidic sites of the catalyst. 68 The peaks appearing at 1505 and 1450 cm −1 for WO 3 have been assigned to the adsorbed pyridine on the Lewis acidic site. 69…”

Greener organic synthetic methods: Sonochemistry and heterogeneous catalysis promoted multicomponent reactions

“…A strategy well aligned with the green chemistry principles and which has been gaining prominence in recent years in the field of heterogeneous catalysis is the immobilization of nanoparticles (NPs) on solid supports, such as porous silica [85] , [86] , [87] , [88] , [89] , zeolites [84] , [90] , [91] , [92] , [93] , polymers [94] , [95] , [96] and carbon-based supports, including carbon nanotubes (CNTs) [97] , [98] , [99] , [100] , graphene [101] , [102] , [103] , graphene oxide (GO) [104] , [105] and graphene nanosheets (GNSs) [103] , [106] . A notable peculiarity of many of these supports – as is the case with graphene - is the property of having the surface easily modifiable, which is only possible due to the presence of large points of nucleation or stabilization [103] .…”

“…The β -amino carbonyl compounds are versatile synthetic intermediates, being found on the synthetic route of important pharmaceutical and natural products [221] , [222] , [223] . Achary and co-workers [104] have developed a cost-effective, environment friendly one-pot method based on the Mannich reaction for the ultrasound-assisted preparation of β -aminocarbonyl compounds ( 1 3 8 ) by copper oxide nanoparticles modified phosphate functionalized graphene (CuO/PGO, 10 mol %) catalysis, and under solvent-free conditions ( Scheme 51 ). This method works via condensation of benzaldehyde ( 1 ), acetophenone ( 8) and aniline ( 17 ).…”