The synthesis, characterization and catalytic activity of a Cu(II) complex derived from 2‐oxoquinoline‐3‐carbaldehyde Schiff base supported on amino‐functionalized silica are reported. 3‐(1H‐Benzo[d]imidazol‐2‐yl)quinolines containing piperidine, morpholine and phenylpiperazine skeletons at the C‐2 position were formed in good to excellent yields via the one‐pot reaction of 2‐chloroquinoline‐3‐carbaldehyde, benzene‐1,2‐diamines and secondary amines in the presence of the nanocatalyst under mild conditions. Moreover, the nanocatalyst was found to be recyclable for up to seven runs without significant loss of activity. Also, a series of 2H‐indazoles were synthesized by the catalytic condensation of 2‐bromobenzaldehyde, sodium azide and primary amines.

This review article discusses the progress related to the synthesis and catalytic applications of sulfonated organic materials, sulfonated silica materials, and sulfonated carbon materials for industrial and laboratory products. These catalysts are widely used in acid-catalyzed processes. Most of these acid catalysts are eco-friendly, reusable, and stable. Moreover, the discovery of unique catalysts is vital for developing new, efficient, and reusable catalysts for industrial and laboratory applications. The aim of this review article is to review the recent studies (2014–2018) in the field of the utility of sulfonated organic materials, sulfonated silica materials, and sulfonated carbon materials for developing acidic catalysts.

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The click chemistry is one of the most powerful CÀ N bond forming-reactions towards five-membered heterocycles. The copper-catalyzed azide-alkyne cycloaddition (CuAAC) has widely used in the discovery of anti-cancer drugs and many articles have been published in this field. This review article aims to review general mechanism aspects and the recent advances (2016-2019) of click chemistry for cancer therapy.

Copper(I) oxide nanoparticles (CONPs) catalyze multicomponent coupling/cycloisomerization reactions between various 2-hydroxybenzaldehydes, secondary amines, and nonactivated alkynes to give 2,3-disubstituted 1-benzofurans. All reactions are carried out under solvent-and ligand-free conditions at 100 °C in air. The combination of copper-catalyzed C-H activation and an Oannulation process is essential for this transformation. This methodology provides rapid access to substituted 1-benzofurans in good to excellent yields with high atom economy and high catalytic efficiency. This procedure eliminates the need for propargylamine derivatives, uncyclized intermediates that make purification difficult. The CONPs and tetrabutylammonium bromide were reused successfully for up to five times.