Green synthesis of Ni–Cu–Mg ferrite nanoparticles using tragacanth gum and their use as an efficient catalyst for the synthesis of polyhydroquinoline derivatives

A new copper(II) Schiff base complex immobilized on silica-coated nanomagnetic Fe 3 O 4 was synthesized from acetylacetonate (acac) and 2aminothiophenol (ATP). The newly synthesized nanocatalyst, Fe 3 O 4 @SiO 2acac-2ATP-Cu(II), was structurally characterized using several analytical techniques. The catalytic activity of the Fe 3 O 4 @SiO 2 -acac-2ATP-Cu(II) nanoparticles was investigated for the synthesis of pyrano[2,3-b]pyridine derivatives from the one-pot three-component reaction of aldehydes, malononitrile and 3-cyano-6-hydroxy-4-methylpyridin-2(1H)-one. A high catalytic performance was exhibited by this nanocatalyst under solvent-free conditions and excellent yields of the products were achieved in reasonably short reaction times. The nanoparticles could be easily separated from the reaction mixture simply by magnetic decantation and reused for several consecutive runs without significant loss of catalytic activity. KEYWORDS acac-2ATP Schiff base-Cu(II) complex, Fe 3 O 4 -immobilized Schiff base copper complex, nanomagnetic Fe 3 O 4 , nanoparticle, pyranopyridine

Section: Introductionmentioning

confidence: 99%

Immobilized Cu(II) Schiff base complex supported on Fe₃O₄ magnetic nanoparticles: A highly efficient and reusable new catalyst for the synthesis of pyranopyridine derivatives

Azarifar

Mahmoudi‐GomYek

Ghaemi

2018

“…In another publication, Taghavi Fardood and his research team have reported a green preparation of Ni–Cu–Mg ferrite nanoparticles using tragacanth gum as biotemplate and metals nitrate as the metal source by the sol–gel strategy (Scheme ) . The structure of the resulting catalyst was confirmed by FT‐IR, XRD, VSM and SEM spectroscopy techniques.…”

Section: Magnetically Recoverable Nanocatalysts In Synthesis Of Polyhmentioning

confidence: 99%

Magnetically Recoverable Catalysts: Catalysis in Synthesis of Polyhydroquinolines

Kazemi

Mohammadi

2019

166

Molecules that contain polyhydroquinoline structural scaffolds are N‐containing heterocycles which are of great interest to organic chemists and biologists. Polyhydroquinoline structural scaffolds which are known as calcium channel blockers have emerged as one of the most important class of drugs used for the treatment of cardiovascular and Alzheimer's diseases. Besides, recovery and reusability of catalysts are important issues to be discussed in modern catalysis research especially in organic synthesis. The concept of magnetically recoverable catalysts has been rapidly developed in recent times. Magnetic separation is an efficient strategy for the rapid separation of catalysts from the reaction medium. Also, an alternative to time‐, solvent‐, and energy‐consuming separation techniques. In this review, we focused on the fabrication, surface‐modification and characterization of nanomagnetic materials and their application, as magnetically recoverable catalysts, in the synthesis of polyhydroquinoline structural scaffolds.

“…The most common MNPs are pure metal nanoparticles, metal oxides, ferrites and metal alloys. [21][22][23][24][25][26][27][28][29][30][31] To date a number of magnetic mesoporous silicas with different functional groups are prepared and applied in a number of chemical processes. [6][7][8] These particles have a broad range of potential applications in the areas of nanocatalysis, [9,10] data storage, [11,12] targeted drugs, [13,14] bioelectrochemistry, [15] adsorption, etc.…”

Section: Introductionmentioning

confidence: 99%

Magnetic nanoporous MCM‐41 supported ionic liquid/palladium complex: An efficient nanocatalyst with high recoverability

Abaeezadeh

Elhamifar

Norouzi

et al. 2019

In this study, a novel magnetic mesoporous MCM-41 silica supported ionic liquid/palladium complex (Fe 3 O 4 @MCM@IL/Pd) with core-structure was prepared and characterized and its catalytic performance was developed under green conditions. The Fe 3 O 4 @MCM@IL/Pd was prepared via a post grafting method and was characterized using Fourier transform infrared spectroscopy, thermal gravimetric analysis, wide-and low-angle powder X-ray diffraction, scanning electron microscopy, transmission electron microscopy, vibration sample magnetometer and energy-dispersive X-ray analyses. This was applied as an efficient and recoverable nanocatalyst for the one-pot synthesis of pyrano [2,3-d]pyrimidine derivatives under ultrasonic conditions. The catalyst was magnetically recovered and reused for 12 consecutive cycles without significant loss of its activity and selectivity.