Application and developing of iron‐doped multi‐walled carbon nanotubes (Fe/MWCNTs) as an efficient and reusable heterogeneous nanocatalyst in the synthesis of heterocyclic compounds

Abstract

Iron‐doped multi‐walled carbon nanotubes (Fe/MWCNTs) is an efficient, ecofriendly and reusable heterogeneous nanocatalyst for the one‐pot synthesis of heterocyclic compounds including bis‐spiro piperidines, piperidines, dihydro‐2‐oxopyrroles, pyrazoles and diazepines at room temperature with good to excellent yields. The heterogeneous nanocatalyst was fully characterized by scanning electron microscopy (SEM), X‐ray diffraction (XRD), inductively coupled plasma (ICP) and FT‐IR analysis. Also, the structures of all prepared compounds were characterized by 1H NMR, 13C NMR, FT‐IR, mass spectrometry (MS) and elemental analysis. The major advantages of these protocols are mild and green reaction conditions, short reaction times, clean reaction, operational simplicity, easy purification and good to excellent yields with the reusable heterogeneous nanocatalyst. The catalyst was ten recycled without significant loss of activity.

Synthesis and characterization of terbium doped TiO2 nanoparticles and their use as recyclable and reusable heterogeneous catalyst for efficient and environmentally sustainable synthesis of spiroannulated indolo[3,2‐c]quinolines‐ mimetic scaffolds of isocryptolepine

“…[25] The development of nanocatalyzed reactions has received much attention in organic syntheses due to their operational simplicity, environmental sustainability and synthetic efficiency with recyclability and reusability of catalyst. [26,27] Titanium oxide (TiO 2 ) catalysis, in view of its environmental sustainability and easy separation including its recyclability and reusability, is considered very close to an ideal synthesis. [28] The doping of terbium ions into TiO 2 NPs has improved the catalytic efficiency with excellent physical and chemical performance because of perfect ability of titanium oxide to form complex with the f-orbital from terbium with the formation of Tb-O-Ti bonds.…”

Synergetic Effect of Iron‐Doped Acidic Multi‐Walled Carbon Nanotubes in the Synthesis of Diverse Substituted Five‐Membered Heterocyclic Compounds

“…These materials play a vital role in improving technologies and devices safety. On the other hand, MWCNs have been the subject of many researchers such as medicine, hydrogen storage, solar cells, energy storage, electronics, sensor devices, and catalysis . It should be noted that different functionalized MWCNs are considered to be the most promising heterogeneous catalysts in organic synthesis ,.…”

“…Unfortunately, multi‐walled carbon nanotubes usually show slow rate or low yield during the organic reactions. Modification of multi‐walled carbon nanotubes with metal nanoparticles or acidic groups can create more active sites to increase their catalytic activity ,…”

“…In continuation of our recent research in the synthesis and application of novel CNs‐based catalytic systems,,, herein, we report the synthesis, characterization, and investigation of catalytic activity of Fe/MWCNs as well as its application as a heterogeneous, efficient and reusable nanocatalyst in the synthesis of some N‐heterocyclic compounds including benzimidazoles, benzothiazoles, benzoxazoles and tetrazoles.…”

MIL‐101(Fe) hexagonal microspindle as a highly efficient, reusable and versatile catalyst for benzo‐fused heterocyclic nucleus synthesis

“…Owing to easy reusability, uniformly distributed pores and well‐organized open channels, MOFs can be applied as highly efficient catalysts in chemical processes . Since Fe 3+ in homogeneous FeCl 3 has shown good catalytic performance, it is a good idea to heterogenize the Fe 3+ species …”