scholarly journals Solid Supported Peptide Catalyst for the Synthesis of Flavanone and Azaflavanones

2019 ◽  
Vol 18 (2) ◽  
pp. 21-28
Author(s):  
Raghavendra Sakirolla ◽  
Yean Kee Lee ◽  
Venkataramana Macharla
Keyword(s):  
Solid Support ◽  
Significant Loss ◽  
Reusable Catalyst ◽  
Peptide Catalyst

A variety of flavanones and azaflavanones have been synthesised from chalcones, catalysed by 30 mol% solid support proline terminal peptide, which is mildly efficient with high conversions yields and could be recycled up to three times without significant loss in its activity.Keywords: , Solid Support Peptide Catalyst, Reusable Catalyst, Cyclisation, Flavanones

scholarly journals Cellulose sulphuric acid as a biodegradable and reusable catalyst for the Knoevenagel condensation

2010 ◽  
Vol 8 (1) ◽  
pp. 12-18 ◽  
Author(s):  
Kiran Shelke ◽  
Suryakant Sapkal ◽  
Kirti Niralwad ◽  
Bapurao Shingate ◽  
Murlidhar Shingare
Keyword(s):  
Sulphuric Acid ◽  
Knoevenagel Condensation ◽  
Ethyl Cyanoacetate ◽  
Reaction Times ◽  
Significant Loss ◽  
Reusable Catalyst ◽  
Environmental Friendliness ◽  
Solvent Free Condition ◽  
High Yields ◽  
Work Up

AbstractA green, mild and efficient method for Knoevenagel condensation of 3-formylchromone/2-chlroquinoline-3-carbaldehyde with active methylene compounds such as Meldrum’s acid/ethyl cyanoacetate using biosupported cellulose sulphuric acid (CSA) in the solid-state by grinding under solvent-free condition has been developed. This method provides several advantages including environmental friendliness, shor t reaction times, high yields and a simple work-up procedure. Moreover, the CSA was successfully reused for four cycles without significant loss of activity.

Magnetic Nanoparticles Supported Acidic Ionic Liquid as a Highly Active and Reusable Catalyst for Esterification

2016 ◽  
Vol 852 ◽  
pp. 485-488 ◽  
Author(s):  
Qiang Zhang ◽  
Xin Zhao ◽  
Xue Hua Zhu ◽  
Ji Hang Li
Keyword(s):  
Ionic Liquid ◽  
Catalytic Activity ◽  
Magnetic Nanoparticles ◽  
Catalytic Performance ◽  
Significant Loss ◽  
Reusable Catalyst ◽  
Hydrogen Sulfate ◽  
External Magnet ◽  
Acidic Ionic Liquid ◽  
Highly Active

A magnetic nanoparticles supported dual acidic ionic liquid catalyst was prepared via anchoring 3-sulfobutyl-1-(3-propyltriethoxysilane) imidazolium hydrogen sulfate onto the surface of silica-coated Fe3O4 nanoparticles. And this novel supported acidic ionic liquid catalyst showed good catalytic performance in esterification. More importantly, the catalyst could be easily recovered by an external magnet and reused six times without significant loss of catalytic activity.

scholarly journals One-pot multicomponent synthesis of highly substituted pyridines using hydrotalcite as a solid base and reusable catalyst

2021 ◽  
pp. 169-174
Author(s):  
Sandip R. Kale ◽  
Santosh Kumar Surve
Keyword(s):  
Catalytic Activity ◽  
Multicomponent Reaction ◽  
Aromatic Aldehydes ◽  
Significant Loss ◽  
Solid Base ◽  
Reusable Catalyst ◽  
Multicomponent Synthesis ◽  
One Pot ◽  
One Pot Synthesis ◽  
Substituted Pyridines

One-pot synthesis of highly substituted pyridines has been demonstrated via multicomponent reaction of aldehydes, malononitrile and thiophenol using Mg-Al hydrotalcite as a solid base and reusable catalyst. The catalytic activity is intimately connected to the basicity of the catalyst. The best activities were observed with the Mg/Al: 5 catalyst. The catalyst could be reused for further run without a significant loss in activity. The protocol was also applicable for various aromatic aldehydes which affords desired product in good to excellent yield.

Anchoring of ruthenium onto imine-functionalized zeolite beta: an efficient route for the synthesis of 4H-benzo[b]pyrans and pyrano[c]chromenes

2014 ◽  
Vol 92 (11) ◽  
pp. 1086-1091 ◽  
Author(s):  
Khalil Tabatabaeian ◽  
Mohammad Ali Zanjanchi ◽  
Manouchehr Mamaghani ◽  
Ali Dadashi
Keyword(s):  
Significant Loss ◽  
Zeolite Beta ◽  
Bet Surface Area ◽  
Reusable Catalyst ◽  
Scanning Electron Micrographs ◽  
X Ray Diffraction ◽  
One Pot ◽  
Efficient Catalyst ◽  
Efficient Route ◽  
The One

The synthesis and characterization of a highly efficient and reusable catalyst, ruthenium immobilized in zeolite beta, are reported. The catalyst was characterized by powder X-ray diffraction, BET surface area measurements, scanning electron micrographs, Fourier-transform infrared spectroscopy, inductive coupled plasma, and elemental analysis. The supported material was used as an efficient catalyst for the one-pot three-component synthesis of 4H-benzo[b]pyrans and pyrano[c]chromenes in good yields. The catalyst was separated from the reaction mixture and reused up to five runs without significant loss of activity.

Fe3O4/g-C3N4 Nanocomposites as a Reusable Catalyst for the Synthesis of 5-Arylidenepyrimidine-2,4,6-(1H,3H,5H)-Trione and Pyrano-Pyrimidinone Derivatives in Aqueous Media

2020 ◽  
Vol 20 (9) ◽  
pp. 5433-5444
Author(s):  
Farhad Shirini ◽  
Fatemeh Kamali
Keyword(s):  
Carbon Nitride ◽  
Aqueous Media ◽  
Reaction Times ◽  
Significant Loss ◽  
Graphitic Carbon Nitride ◽  
Reusable Catalyst ◽  
Magnetic Nanocatalyst ◽  
Reaction Conditions ◽  
Simple Preparation ◽  
High Yields

A green magnetic nanocatalyst is developed by immobilization of Fe3O4 on Graphitic carbon nitride (g-C3N4) support for the efficacious synthesis of 5-arylidenepyrimidine-2,4,6-(1H,3H,5H)-trione and pyrano-pyrimidinone derivatives in aqueous media. The most momentous features of the present protocol are the simple preparation of the catalyst, mild reaction conditions, short reaction times and high yields of the products. Moreover, the magnetic nanocatalyst Fe3O4/g-C3N4 can be recycled effectively and reused several times, without a significant loss in reactivity.

Zirconium(IV) 4-sulphophenylethyliminobismethylphosphonate as an efficient and reusable catalyst for one-pot synthesis of 3,4-dihydropyrimidones under solvent-free conditions

2011 ◽  
Vol 65 (6) ◽  
Author(s):  
Xin-Bin Yang ◽  
Xiang-Kai Fu ◽  
Yu Huang ◽  
Ren-Quan Zeng
Keyword(s):  
Catalytic Activity ◽  
Elemental Analysis ◽  
Biginelli Reaction ◽  
Significant Loss ◽  
Solvent Free ◽  
Reusable Catalyst ◽  
One Pot ◽  
Efficient Catalyst ◽  
Solvent Free Conditions ◽  
Simple Filtration

AbstractZirconium(IV) 4-sulphophenylethyliminobismethylphosphonate (ZSBEDP) was prepared and characterised by elemental analysis, IR, TG-DSC, and XRD. ZSBEDP was found to be an efficient catalyst for the Biginelli reaction of aromatic aldehyde, ethyl acetoacetate, and urea or thiourea under solvent-free conditions so as to give 3,4-dihydropyrimidones in good to excellent yields. The catalyst can be separated by simple filtration and reused without significant loss of its catalytic activity.

scholarly journals Palladium(II) on 4 Å Molecular Sieves: A Simple and Reusable Catalyst for the Preparation of Ynones

2020 ◽  
Vol 150 (11) ◽  
pp. 3335-3341
Author(s):  
Kinga Juhász ◽  
Zoltán Hell
Keyword(s):  
Molecular Sieves ◽  
Significant Loss ◽  
Reusable Catalyst ◽  
Terminal Alkynes ◽  
Acyl Chlorides

Abstract Pd2+ on 4 Å molecular sieves support has been prepared and investigated. The catalyst has successfully been used in the reaction of acyl chlorides and terminal alkynes yielding ynones. The catalyst can be reused without significant loss of activity. Graphic Abstract

Commercial ZrO2 as a new, efficient, and reusable catalyst for the one-step synthesis of quinolines in solvent-free conditions

2009 ◽  
Vol 87 (8) ◽  
pp. 1122-1126 ◽  
Author(s):  
Mona Hosseini-Sarvari
Keyword(s):  
Catalytic Activity ◽  
Carbonyl Compound ◽  
Significant Loss ◽  
Solvent Free ◽  
Reusable Catalyst ◽  
Efficient Catalyst ◽  
Solvent Free Conditions ◽  
One Step ◽  
The One ◽  
High Yields

Commercially available zirconia (ZrO2) is reported as an extremely efficient catalyst for the synthesis of quinolines. A one-step reaction of 2-aminoarylketones and a carbonyl compound (Friedlander reaction) took place under solvent-free conditions to afford the corresponding quinolines in good-to-high yields in the presence of ZrO2. Furthermore, the catalyst is reused several times without any significant loss of its catalytic activity.

Porous acrylate monolith supported Pd nanoparticles: highly active and reusable catalyst for Suzuki–Miyaura reaction in water

RSC Advances ◽  
2014 ◽  
Vol 4 (40) ◽  
pp. 20847-20855 ◽  
Author(s):  
Mahasweta Nandi ◽  
Hiroshi Uyama
Keyword(s):  
Pd Nanoparticles ◽  
Significant Loss ◽  
High Yield ◽  
Reusable Catalyst ◽  
Highly Active ◽  
Methacrylate Copolymer ◽  
Reaction Cycles ◽  
Reaction In Water ◽  
Very High ◽  
Supported Pd

Palladium-Schiff-base functionalized porous methyl methacrylate-glycidyl methacrylate copolymer monoliths can be used for Suzuki–Miyaura reaction of aryl halides in water under aerobic conditions, giving biphenyl products with very high yield and the catalyst can be reused for several reaction cycles without significant loss in its activity.

Nano-rod ZnO as a novel and reusable catalyst for C−P bond formation and hydrophosphonation of isatin derivatives under solvent-free conditions

2013 ◽  
Vol 91 (11) ◽  
pp. 1117-1122 ◽  
Author(s):  
Mona Hosseini-Sarvari ◽  
Mina Tavakolian
Keyword(s):  
Catalytic System ◽  
Efficient Method ◽  
Room Temperature ◽  
Bond Formation ◽  
Significant Loss ◽  
Solvent Free ◽  
Reusable Catalyst ◽  
Reaction Products ◽  
Solvent Free Conditions ◽  
Isatin Derivatives

A highly efficient method for the synthesis of α1-oxindole-α-hydroxyphosphonates via nano-rod ZnO catalyzed hydrophosphonation of isatin derivatives was developed. The reaction products are in excellent yields using the catalytic system nano-rod ZnO (25 mol%) under solvent-free conditions at room temperature. The catalyst can be reused several times without any significant loss of its activity.

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