- Magnetic nanostructure-anchored mixed-donor ligand system based on carboxamide and N-heterocyclic thiones: An efficient support of CuI catalyst for synthesis of imidazo[1,2-a]pyridines in eutectic medium
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A Cu-incorporated nanocatalyst has been developed by immobilizing copper iodide on a magnetically retrievable mixed-donor ligand system, containing carboxamide, imidazolidine-2-thione and imidazole-2-thione donor groups and characterized by various analys
- Heydari, Akbar,Salamatmanesh, Arefe
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- CuI/Fe3O4 NPs@Biimidazole IL-KCC-1 as a leach proof nanocatalyst for the synthesis of imidazo[1,2-a]pyridines in aqueous medium
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In the present work, an innovative leach proof nanocatalyst based on dendritic fibrous nanosilica (DFNS) modified with ionic liquid loaded Fe3O4 NPs and CuI salts was designed and applied for the rapid synthesis of imidazo[1,2-a]pyri
- Azizi, Sajjad,Shadjou, Nasrin,Soleymani, Jafar
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- Copper Iodide Nanoparticles Immobolized Porous Polysulfonamide: An Effective Nanocatalyst for Synthesis of Imidazo [1,2-a] Pyridines
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An efficient route was developed for the synthesis of a new polymer, porous cross-linked poly(ethyleneamine)-polysulfonamide (PEA-PSA), as an organic support for the imobilization of CuI nanoparticles (PEA-PSA@CuI). The resulting catalyst works as an effi
- Hamidi Dastjerdi, Fatemeh,Ghorbani-Vaghei, Ramin,Alavinia, Sedigheh
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p. 3514 - 3522
(2020/06/02)
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- Magnetic Cu0@HAP@γ-Fe2O3 nanoparticles: An efficient catalyst for one-pot three-component reaction for the synthesis of imidazo[1,2-a]pyridines
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Cu(0) incorporated magnetic hydroxyapatite nanoparticles (Cu0@HAP@γ-Fe2O3 NPs) was conveniently synthesized via the ion exchange reaction, oxidation, and reduction steps. The structure and composition of the nanohybrid wer
- Sun, Wei,Jiang, Wei,Zhu, Gan,Li, Yiqun
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- Development of novel efficient 2D nanocomposite catalyst towards the three-component coupling reaction for the synthesis of imidazo[1,2-a]pyridines
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Two dimensional (2D) materials such as graphene and functionalized hexagonal boron nitride (h-BN) supported copper catalysts (CuO/rGO, CuO/h-BN, Cu(0)/rGO, Cu(0)/h-BN, CuS/rGO and CuS/h-BN) were prepared, characterized and evaluated their catalytic activity for the synthesis of imidazo[1,2-a]pyridines via one pot three component reaction between 2-aminopyridine, aldehyde and terminal alkynes. The imidazo[1,2-a]pyridines are an imperative class of nitrogen ring containing heterocyclic compounds which has wide range of applications in medicinal chemistry and drug molecule production. The reported synthetic protocol provides a rapid access to substituted imidazo[1,2-a]pyridines with excellent yields. CuO/rGO nanocomposite material was found to be highly active catalyst for the aforementioned reaction. The advantages of our protocol for the preparation of imidazo[1,2-a]pyridines over other previously reported includes shorter reaction times, functional group tolerance, recyclable catalyst and additive-free.
- Hussain, Najrul,Gogoi, Pranjal,Das, Manash R.,Sengupta, Pinaki,Fedorov, Vladimir E.,Asanov, Igor P.,Kozlova, Mariia N.,Artemkina, Sofya B.
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p. 368 - 379
(2017/06/19)
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- Facile synthesis of ZnAl2O4 nanoparticles: Efficient and reusable porous nano ZnAl2O4 and copper supported on ZnAl2O4 catalysts for one pot green synthesis of propargylamines and imidazo[1,
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A simple, facile and efficient route was developed for the synthesis of nano ZnAl2O4 using ethanolamine. ZnAl2O4 nanoparticles were found to be smaller when calcined at 500 °C than at 700 °C. The synthesized nan
- Mandlimath, Triveni Rajashekhar,Sathiyanarayanan, Kulathu I.
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p. 3117 - 3125
(2016/01/16)
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- CuO-CuAl2O4 and d-glucose catalyzed synthesis of a family of excited state intramolecular proton transfer imidazo[1,2-a]pyridine analogues and their optical properties
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A simple and efficient route to luminescent imidazo[1,2-a]pyridines from 2-aminopyridines, phenylacetylene and arylaldehydes was achieved by an one-pot, tandem process starting with an A3-coupling followed by 5-exo-dig cyclization. Copper(II)oxide/copper
- Balijapalli, Umamahesh,Iyer, Sathiyanarayanan Kulathu
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- Nano Fe3O4 supported biimidazole Cu(i) complex as a retrievable catalyst for the synthesis of imidazo[1,2-a]pyridines in aqueous medium
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A novel magnetically recoverable nano-catalyst based on a biimidazole Cu(i) complex has been synthesized by covalent grafting of biimidazole on chloride-functionalized silica@magnetite nanoparticles, followed by metalation with CuI. The synthesized catalyst was characterized by various techniques such as CHN, NMR, FT-IR, TG/DTG, SEM, TEM, EDS, XRD, AAS, ICP-OES and VSM which revealed the superparamagnetic nature of the particles. The amount of Cu in the catalyst was measured to be 1.2 mmol g-1 by ICP-OES and AAS. From electron microscopy (SEM and TEM) studies it can be inferred that the particles are mostly spherical in shape and have an average size of 20 nm. Elemental and thermo gravimetric analysis (CHN and TG) results indicate the loading amount of functionalized organic groups on the magnetic material was 1.4 mmol g -1. The prepared nanocatalyst was shown to have excellent and green catalytic activity in the synthesis of imidazo[1,2-a]pyridines in aqueous media. The catalyst can be easily recovered by applying an external magnetic field and reused for atleast 10 times without deterioration in catalytic activity.
- Tajbakhsh, Mahmood,Farhang, Maryam,Hosseinzadeh, Rahman,Sarrafi, Yaghoub
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p. 23116 - 23124
(2014/06/24)
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- Simple and efficient one-pot synthesis of imidazo[1,2-a]pyridines catalyzed by magnetic nano-Fe3O4-KHSO4·SiO 2
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The present report highlights a magnetic nano-Fe3O 4-KHSO4·SiO2 catalyzed synthesis of imidazo[1,2-a]pyridines. The synthetic strategy adopted is expedient, versatile, and offers good to excellent yields from readily available starting materials.
- Guntreddi, Tirumaleswararao,Allam, Bharat Kumar,Singh, Krishna Nand
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p. 2635 - 2638,4
(2012/12/12)
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- Tandem amination/cycloisomerization of aryl propargylic alcohols with 2-aminopyridines as an expedient route to imidazo[1,2-a]pyridines
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A new tandem route leading to imidazo[1,2-a]pyridines has been explored through the direct amination of aryl propargylic alcohols with 2-aminopyridines and their subsequent intramolecular cycloisomerization. A ZnCl2/CuCl system has been develop
- Liu, Ping,Deng, Chun-Lin,Lei, Xinsheng,Lin, Guo-Qiang
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p. 7308 - 7316
(2012/01/06)
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- Synthesis of imidazo[1,2a]pyridines via three-component reaction of 2-aminopyridines, aldehydes and alkynes
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A novel three-component reaction towards the synthesis of imidazo[1,2a]pyridines was independently developed based on 2-aminopyridines, aldehydes and alkynes, and thereby imidazo[1,2a]pyridines were obtained in acceptable yields by the CuSO4/TsOH catalyzed three-component reaction.
- Liu, Ping,Fang, Li-Song,Lei, Xinsheng,Lin, Guo-Qiang
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supporting information; experimental part
p. 4605 - 4608
(2010/09/18)
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