Abstract
A new nano-scale Cu@salicylaldehyde-modified-chitosan (Cu@Sal-CS) was synthesized through a green, eco-friendly and cost-effective technique. The prepared catalyst was characterized using Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), Energy-dispersive X-ray spectroscopy (EDXS), and inductively coupled plasma (ICP) analysis. The synthesized Cu@Sal-CS catalyst indicated its performance in the C–O and C–N oxidative coupling using the reaction of 1,3-dicarbonyl derivatives/2- substituted phenols with amides for the preparation of carbamates, as well as in the reaction of aldehydes and various amines in the synthesis of amides. The significant features of this work are operational simplicity of catalyst synthesis, in situ and new modification method, use of an efficient, recoverable, frequently reused and stable catalyst without any loss of catalytic activity, and high yields of the products in short times.
Highlights
A new nano-scale Cu@salicylaldehyde-modified-chitosan (Cu@Sal-CS) was synthesized through a green, eco-friendly and cost-effective technique
Azizi et al reported that F e3O4@EDTA-Cu(II) nanoparticles could catalyze the reaction of formamides with β-dicarbonyl compounds in the presence of TBHP as the oxidant to give enol carbamates in good yields[3]
Solvent-free room temperature ball milling of the chitosan and salicylaldehyde led to the formation of an imine bond
Summary
A new nano-scale Cu@salicylaldehyde-modified-chitosan (Cu@Sal-CS) was synthesized through a green, eco-friendly and cost-effective technique. 30 mg of Cu@Sal-Cs catalyst and 1 mmol of the 2-carbonyl-substituted phenols with amides (6 mL) in the presence of 1.5 eq of TBHP, under microwave irradiation was chosen as the optimized reaction condition.
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