Multi-component synthesis of highly substituted imidazoles catalyzed by nanorod vanadatesulfuric acid

2015 ◽  
Vol 69 (11) ◽  
Author(s):  
Masoud Nasr-Esfahani ◽  
Morteza Montazerozohori ◽  
Tooba Abdizadeh
Keyword(s):  
Reaction Time ◽  
High Purity ◽  
Ammonium Acetate ◽  
Chlorosulfonic Acid ◽  
Solvent Free ◽  
One Pot ◽  
Short Reaction Time ◽  
Solvent Free Conditions ◽  
High Yields ◽  
Tetrasubstituted Imidazoles

AbstractNanorod vanadatesulfuric acid (VSA NRs), as a recyclable and eco-benign catalyst, was used for one-pot synthesis of 2,4,5-trisubstituted imidazoles and 1,2,4,5-tetrasubstituted imidazoles using aldehydes, benzil, benzoin or 9,10-phenanthrenequinone and ammonium acetate or aniline under solvent-free conditions providing high to excellent yields. VSA is easily prepared by a simple reaction of chlorosulfonic acid and sodium metavanadate in high purity. As compared with the conventional procedures, the present protocol offers several advantages such as simplicity of procedure, short reaction time, high yields, easy workup, recoverability and reusability of the catalyst and simple purification of the products.

One-Pot, Regioselective Synthesis of Homopropargyl Alcohols using Propargyl Bromide and Carbonyl Compound by the Mg-mediated Reaction under Solvent-free Conditions

2020 ◽  
Vol 17 (6) ◽  
pp. 438-442
Author(s):  
Xiaofang Ma ◽  
Shunxi Li ◽  
Samrat Devaramani ◽  
Guohu Zhao ◽  
Daqian Xu
Keyword(s):  
Reaction Time ◽  
Organic Synthesis ◽  
Carbonyl Compounds ◽  
Solvent Free ◽  
Propargyl Bromide ◽  
Important Goal ◽  
One Pot ◽  
Short Reaction Time ◽  
Solvent Free Conditions ◽  
Volatile Organic

The elimination of volatile organic solvents in organic synthesis is the most important goal in “Green” chemistry. We report a simple, efficient and facile method for the addition of progargyl bromide to carbonyl compounds using Mg metal as a mediator under solvent-free conditions which could regioselectively generate homopropargyl alcohols efficiently in good to excellent yields. The procedure has advantages such as short reaction time, operationally simple, excellent product yields, high regioselectivity and organic solvent-free.

scholarly journals A Green, Expeditious, One-Pot Synthesis of 3, 4-Dihydropyrimidin-2(1H)-ones Using a Mixture of Phosphorus Pentoxide-Methanesulfonic Acid at Ambient Temperature

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Amulrao Borse ◽  
Mahesh Patil ◽  
Nilesh Patil ◽  
Rohan Shinde
Keyword(s):  
Reaction Time ◽  
Ambient Temperature ◽  
Room Temperature ◽  
Simple Procedure ◽  
Methanesulfonic Acid ◽  
Phosphorus Pentoxide ◽  
One Pot ◽  
Short Reaction Time ◽  
Solvent Free Conditions ◽  
High Yields

An expeditious, one-pot method for the synthesis of 3,4-dihydropyrimidin-2(1H)-ones using a mixture of phosphorus pentoxide-methanesulfonic acid (Eaton’s reagent) at room temperature under solvent-free conditions is described. The salient features of this method include short reaction time, green aspects, high yields, and simple procedure.

Facile Synthesis of 1,8-dioxooctahydro Xanthenes by Reusable Zinc Sulfide based Ternary Nanocomposite via Hydrothermal Route

2020 ◽  
Vol 9 (1) ◽  
pp. 72-79
Author(s):  
Jhansi R. Sunkara ◽  
Sathish M. Botsa
Keyword(s):  
Catalytic Activity ◽  
Reaction Time ◽  
Metal Oxide ◽  
Solvent Free ◽  
Hydrothermal Route ◽  
One Pot ◽  
Co Catalyst ◽  
Short Reaction Time ◽  
Solvent Free Conditions ◽  
Xanthene Derivatives

Background: Metal oxide or metal oxide composite nanoparticles are attaining tremendous importance due to their catalytic activities for various organic transformations. Objective: To report the one-pot synthesis of xanthene derivatives prepared by ZnS-Fe2O3-Ag composite under solvent-free conditions. Method: To prepare nanocomposite by a facile and simple hydrothermal approach. Results: The prepared composite is smaller (17.56 nm) in size and can be easily separable, recycled and reused six times without any significant loss of catalytic activity with excellent yields. In short reaction time, great catalytic activity was perceived with no co-catalyst and any other activator. Conclusion: In conclusion, ZnS-Fe2O3-Ag composite provides a simple, economical, efficient and greener method for the synthesis of one-pot multicomponent reaction of aldehyde with 1,3-diketones under solvent free conditions for the synthesis of 1,8-dioxooctahydro xanthenes. In short reaction time, great catalytic activity was perceived with no co-catalyst and any other activator.

scholarly journals An Efficient One-Pot Synthesis of 1, 5-Benzodiazepine Derivatives Catalyzed by TBAB under Mild Conditions

2012 ◽  
Vol 9 (1) ◽  
pp. 407-414 ◽  
Author(s):  
Mohammad A. Baseer ◽  
Asgar Jafar Khan
Keyword(s):  
Reaction Time ◽  
Solvent Free ◽  
Ammonium Bromide ◽  
One Pot ◽  
Short Reaction Time ◽  
Mild Conditions ◽  
Excellent Yield ◽  
One Pot Synthesis ◽  
Solvent Free Conditions ◽  
Benzodiazepine Derivatives

2,3-Dihydro-1H-1,5-benzodiazepines were synthesized by reaction ofo-phenylenediamine with ketones (acyclic / cyclic) under solvent free conditions in the presence of tetra butyl ammonium bromide (TBAB) in short reaction time with excellent yield.

5-Pyrrolidin-2-yltetrazole-Promoted One-Pot Hantzsch Polyhydroquinoline Synthesis Using NH4HCO3 as Nitrogen Source

2008 ◽  
Vol 61 (11) ◽  
pp. 860 ◽  
Author(s):  
Weike Su ◽  
Jia Li ◽  
Jianjun Li
Keyword(s):  
Reaction Time ◽  
Coupling Reaction ◽  
Ammonium Bicarbonate ◽  
One Pot ◽  
Short Reaction Time ◽  
Environmental Friendly ◽  
Solvent Free Conditions ◽  
Active Methylene Compounds ◽  
High Yields ◽  
Active Methylene

A straightforward and green synthesis of polyhydroquinoline derivatives was reported via a four-component coupling reaction of aldehydes, dimedone, active methylene compounds, and ammonium bicarbonate in the presence of 5-pyrrolidin-2-yltetrazole under solvent-free conditions. The method offers several advantages including high yields, an environmental friendly procedure, a short reaction time, and easy isolation of products.

A Study on the Sulfonation of Aromatic Amines with Sulfuric Acid under Microwave Irradiation

2003 ◽  
Vol 2003 (8) ◽  
pp. 493-494 ◽  
Author(s):  
Hui-Zhang Li ◽  
Li-Wei Xiao ◽  
Hong-Ya Li ◽  
Kai-Fang Wang ◽  
Xu Li
Keyword(s):  
Sulfuric Acid ◽  
Reaction Time ◽  
Microwave Irradiation ◽  
Aromatic Amines ◽  
Solvent Free ◽  
Short Reaction Time ◽  
Solvent Free Conditions ◽  
High Yields

The sulfonation of aromatic amines with high yields, simple operations and short reaction time has been studied under microwave irradiation in solvent-free conditions.

scholarly journals N-Bromosuccinimide Catalyzed Three Component One-Pot Efficient Synthesis of 2,4,5-Triaryl-1H-imidazoles from Aldehyde, Ammonium Acetate, and 1,2-Diketone or α-Hydroxyketone

2017 ◽  
Vol 58 (1) ◽  
Author(s):  
Behrooz Maleki ◽  
Samaneh Sedigh Ashrafi
Keyword(s):  
Present Method ◽  
Ammonium Acetate ◽  
Reaction Times ◽  
Solvent Free ◽  
Efficient Synthesis ◽  
One Pot ◽  
Environmental Friendliness ◽  
Solvent Free Condition ◽  
Solvent Free Conditions ◽  
High Yields

<p>A simple, green, and efficient method for the synthesis of 2,4,5-triaryl-1<em>H</em>-imidazoles using <em>N</em>-bromosuccinimide (NBS) as a catalyst under solvent-free condition is described. The major advantages of the present method are: high yields, less reaction times, solvent-free conditions, easy purification of the products, environmental friendliness, and convenient operation.</p>

scholarly journals Magnetic nanoparticle-supported sulfonic acid as a green catalyst for the one-pot synthesis of 2,4,5-trisubstituted imidazoles and 1,2,4,5-tetrasubstituted imidazoles under solvent-free conditions

2021 ◽  
Vol 27 (1) ◽  
pp. 71-78
Author(s):  
Mahnaz Sakhdari ◽  
Ali Amoozadeh ◽  
Eskandar Kolvari
Keyword(s):  
High Purity ◽  
Sulfonic Acid ◽  
Magnetic Nanoparticle ◽  
Solvent Free ◽  
High Catalytic Activity ◽  
One Pot ◽  
Efficient Catalyst ◽  
Solvent Free Conditions ◽  
The One ◽  
Tetrasubstituted Imidazoles

Abstract In this work, magnetic nanoparticle-supported sulfonic acid (γ-Fe2O3-SO3H) is used as an efficient catalyst in the synthesis of 2,4,5-trisubstituted imidazoles and 1,2,4,5-tetrasubstituted imidazoles in a short time (40–70 min for trisubstituted imidazoles and 30–40 min for tetrasubstituted imidazoles) and high-purity products were obtained (92–98% for trisubstituted imidazoles and 94–98% for tetrasubstituted imidazoles) in simple multicomponent reactions. The structure of these products was confirmed via FT-IR and NMR. Green and recyclable catalysts, eco-friendly and solvent-free conditions, high catalytic activity, shorter reaction time, easy recovery by an external magnet, high purity, and excellent yields are some features of these reactions.

Chlorosulfonic Acid Supported Piperidine-4-carboxylic Acid (PPCA) Functionalized Fe3O4 Nanoparticles (Fe3O4-PPCA): The Efficient, Green and Reusable Nanocatalyst for the Synthesis of Pyrazolyl Coumarin Derivatives under Solvent-Free Conditions

2019 ◽  
Vol 22 (2) ◽  
pp. 123-128
Author(s):  
Setareh Habibzadeh ◽  
Hassan Ghasemnejad-Bosra ◽  
Mina Haghdadi ◽  
Soheila Heydari-Parastar
Keyword(s):  
Carboxylic Acid ◽  
Fe3o4 Nanoparticles ◽  
High Efficiency ◽  
Reaction Times ◽  
Chlorosulfonic Acid ◽  
Aromatic Aldehydes ◽  
Solvent Free ◽  
Magnetic Nanocatalyst ◽  
One Pot ◽  
Solvent Free Conditions

Background: In this study, we developed a convenient methodology for the synthesis of coumarin linked to pyrazolines and pyrano [2,3-h] coumarins linked to 3-(1,5-diphenyl-4,5- dihydro-1H-pyrazol-3-yl)-chromen-2-one derivatives using Chlorosulfonic acid supported Piperidine-4-carboxylic acid (PPCA) functionalized Fe3O4 nanoparticles (Fe3O4-PPCA) catalyst. Materials and Methods:: Fe3O4-PPCA was investigated as an efficient and magnetically recoverable Nanocatalyst for the one-pot synthesis of substituted coumarins from the reaction of coumarin with a variety of aromatic aldehydes in high to excellent yield at room temperature under solvent-free conditions. The magnetic nanocatalyst can be easily recovered by applying an external magnet device and reused for at least 10 reaction runs without considerable loss of reactivity. Results and Conclusion: The advantages of this protocol are the use of commercially available materials, simple and an inexpensive procedure, easy separation, and an eco-friendly procedure, and it shows good reaction times, good to high yields, inexpensive and practicability procedure, and high efficiency.

Synthesis and Characterization of a Novel Ionic Liquid Based on N,N,N,N-tetramethylethylenediamine and its Application in the Synthesis of 1,8-dioxo-octahydro Xanthenes

2018 ◽  
Vol 21 (7) ◽  
pp. 526-532 ◽  
Author(s):  
Zahra Abdi Piralghar ◽  
Mohammad Mahmoodi Hashemi ◽  
Ali Ezabadi
Keyword(s):  
Ionic Liquid ◽  
Chlorosulfonic Acid ◽  
Solvent Free ◽  
Aryl Aldehydes ◽  
Acidic Ionic Liquid ◽  
Brønsted Acidic Ionic Liquid ◽  
Solvent Free Conditions ◽  
Aryl Aldehyde ◽  
High Yields

Aim and Objective: In this work, we synthesized and characterized a novel Brönsted acidic ionic liquid from the reaction of N, N, N’, N’-tetramethylethylenediamine with chlorosulfonic acid and explored its catalytic activity in 1, 8-dioxo-octahydroxanthenes synthesis. Materials and Methods: Dimedone, aryl aldehydes, and the ionic liquid as the catalyst were reacted under solvent-free conditions. The progressive of the reaction was monitored by a thin layer of chromatography (ethyl acetate/n-hexane = 1/5). All products were characterized as the basis of their spectra data and melting point by comparison with those reported in the literature. Results: The prepared ionic liquid was successfully applied in the synthesis of 1, 8-dioxooctahydroxanthenes in good to high yields on the reaction of aryl aldehyde and dimedone at 120oC under solvent-free conditions. Conclusion: This research demonstrates that the catalyst is impressive for 1, 8-dioxo-octahydroxanthenes synthesis under solvent-free conditions.

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