The first urea‐based ionic liquid‐stabilized magnetic nanoparticles: an efficient catalyst for the synthesis of bis(indolyl)methanes and pyrano[2,3‐d]pyrimidinone derivatives

Abstract

Urea‐based ionic liquid stabilized on silica‐coated Fe3O4 magnetic nanoparticles, {Fe3O4@SiO2@(CH2)3‐Urea‐SO3H/HCl}, as an unexceptionable and smooth releasing urea fertilizer in alkali soils was synthesized and fully characterized using Fourier transform infrared, UV–visible and energy‐dispersive X‐ray spectroscopies, X‐ray diffraction, scanning and transmission electron microscopies, atomic force microscopy and thermogravimetric analysis. The nanostructure catalyst as a novel, green and efficient catalyst was applied for the synthesis of bis(indolyl)methane derivatives via the condensation reaction between 2‐methylindole and aldehydes at room temperature under solvent‐free conditions. Also, pyrano[2,3‐d]pyrimidinone derivatives were prepared in the presence of the nanomagnetic urea‐based catalyst by the one‐pot three‐component condensation reaction of 1,3‐dimethylbarbituric acid, aldehydes and malononitrile under solvent‐free conditions at 60 °C. To the best of our knowledge, this is the first report of the synthesis of urea‐based ionic liquid stabilized on silica‐coated Fe3O4 magnetic nanoparticles. So the present work can open up a new and promising insight in the course of rational design, synthesis and applications of task‐specific fertilizer‐based nanomagnetic ionic liquids with desirable properties as unexceptionable substances for sustainable processes. Copyright © 2016 John Wiley & Sons, Ltd.

Silica Bonded N-(Propylcarbamoyl)sulfamic acid (SBPCSA) Mediated Expeditious Approach to C–C Bond Formation: An Innovative Pathway for Acrylonitrile Derivatives

“…In this regards, carbon based solid acid catalysts have attracted much more attention due to more activity and selectivity [10][11][12]. These sulfonated silica/carbon hybrids have been prepared from the sulfonation of carbonized biomaterials have been extensively used in organic syntheses [13][14][15].…”

An Insight View on Synthetic Protocol, Mechanistic and Biological Aspects of Biscoumarin Derivatives

“…Zolfigol et al . represented a unique and useful approach for the formation of biscoumarins from aromatic aldehydes and 4HC using 0.01 g of {Fe 3 O 4 @SiO 2 @(CH 2 ) 3 semicarbazide‐SO 3 H/HCl} as MNP catalyst in solvent‐free condition at the temperature of 80 °C ( Scheme : Method 6) .…”

Magnetic Fe3O4 nanoparticles supported imine/Thiophene‐nickel (II) complex: A new and highly active heterogeneous catalyst for the synthesis of polyhydroquinolines and 2, 3‐dihydroquinazoline‐4(1H)‐ones

“…First, the effect of solvent and solvent-free condition on the four-component reaction, catalyzed by 25 [11][12][13][14]. As seen in Table 1, higher reaction temperature (110°C) did not improve the reaction time and product yield, while lower reaction temperatures (r.t, 60 and 90°C) decreased the product yield.…”

“…Among various solid supports used for the immobilization of metallic catalysts, magnetic nanoparticles have emerged as a robust and high-surface-area heterogeneous catalyst support, because they could not only stabilize the reaction catalytic species, but also improve the catalytic activity [7][8][9][10][11][12] The simple separation of MNPs-supported catalysts from products or mixture reaction by an external magnet is the most notable advantage of magnetic nanoparticles. [13][14][15] It is noteworthy that magnetic-supported catalysts can be reused many times while keeping their initial activity. Among the various employed magnetic NPs as the core magnetic support, Fe 3 O 4 nanoparticles have been widely studied both for their scientific interests and technological applications.…”