A comparative study on the catalytic activity of Fe3O4@SiO2–SO3H and Fe3O4@SiO2–NH2 nanoparticles for the synthesis of spiro [chromeno [2, 3-c] pyrazole-4, 3′-indoline]-diones under mild conditions

A comparative study on the catalytic activity of Fe3O4@SiO2–SO3H and Fe3O4@SiO2–NH2... Keywords Fe O @SiO –SO HNPs  Spirooxindoles  Multicomponent reactions 3 4 2 3 One-pot synthesis  Core–shell Introduction Following the principles of green chemistry, using recyclable solid catalysts in organic reactions has attracted much attention in recent years [1]. Among different solid catalysts, supported magnetic nanoparticles (MNPs) are more interesting and widely used in organic reactions [2]. MNPs have especially attracted great attention due to their extensive range of usages in different fields such as drug delivery [3], magnetic resonance imaging (MRI) [4], cancer treatment through hyperthermia [5], and absorption of heavy metals from aqueous solutions [6]. The significant properties of Fe O -based nanocatalysts include high stability, easy preparation, high catalyst 3 4 loading, and simple catalyst recycling. In addition, surface functionalization of MNPs is an effective way to create a link between the feature of homogeneous and heterogeneous catalysis [7, 8]. Recently, MNPs have been used as an efficient heterogeneous nanocatalyst in a number of organic reactions such as Buchwald–Hartwig, Suzuki [9], Sonogashira–Hagihara [10], and Paal–Knorr [11, 12] reactions, synthesis of sulfon- amides [13], coupling of phenols with aryl halides [14], and synthesis ofa-aminonitriles and imines [15]. Multicomponent reactions (MCRs) are regarded as economic methods http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

A comparative study on the catalytic activity of Fe3O4@SiO2–SO3H and Fe3O4@SiO2–NH2 nanoparticles for the synthesis of spiro [chromeno [2, 3-c] pyrazole-4, 3′-indoline]-diones under mild conditions

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Publisher
Springer Netherlands
Copyright
Copyright © 2016 by Springer Science+Business Media Dordrecht
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1007/s11164-016-2470-6
Publisher site
See Article on Publisher Site

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