Nickel oxide nanoparticles: a green and recyclable catalytic system for the synthesis of diindolyloxindole derivatives in aqueous medium

Abstract

This study focuses on the use of nano-NiO particles as green and inexpensive nanocatalysts for the synthesis of diindolyl oxindoles, an important class of potentially bioactive compounds.

A green biosynthesis of NiO nanoparticles using aqueous extract of Tamarix serotina and their characterization and application

“…In continuation of our work on the synthesis of efficient and nontoxic nanocatalysts and their application in syntheses of biologically important compounds, [32][33][34][35][36][37][38] in the work reported here, we synthesized nickel oxide nanoparticles using aqueous extract of Tamarix serotina and evaluated their catalytic activity in the preparation of quinoline derivatives. Quinolines were produced in good to high yields (60-90%) by treatment of 2-aminobenzophenone with various carbonyl compounds (Scheme 1).…”

Application of Fe3O4@SiO2@sulfamic acid magnetic nanoparticles as recyclable heterogeneous catalyst for the synthesis of imine and pyrazole derivatives in aqueous medium

“…In continuation of our work on the synthesis of efficient and nontoxic nanocatalysts and their application in the synthesis of biologically important compounds [47][48][49][50][51][52], in this work, we used Fe 3 O 4 @SiO 2 @sulfamic acid as a nanometer-scale, magnetic, supported, acidic catalyst for the synthesis of pyrazoles by the condensation of dicarbonyl compounds and hydrazines/hydrazides. Pyrazole and imine derivatives were produced with good to high yields (78-98 %) in aqueous medium (Scheme 1).…”

Iron‐containing ionic liquid as an efficient and recyclable catalyst for the synthesis of C3‐substituted indole derivatives

“…Therefore, various methods have been reported for preparing this class of compounds . The most straightforward method to obtain the heterocycle involves the condensation of indoles with different carbonyl compounds (aldehydes or ketones), which was often promoted by homo‐ and heterogeneous catalysts such as acid catalysts, nano catalysts, supported catalysts, metal catalysts, ion exchange resin, and enzymes . Although these reported protocols have made some certain merits, many of them still have notable disadvantages such as harsh reaction conditions, long reaction times, limited substrate scope, using expensive Lewis acids and solvents, high catalyst loading and generation of large amounts of harmful wastes.…”