scholarly journals Ionic liquid 1-butyl-3-methylimidazolium bromide ([bmim]Br): A green and neutral reaction media for the efficient, catalyst-free synthesis of quinoxaline derivatives

2010 ◽  
Vol 75 (10) ◽  
pp. 1315-1324 ◽  
Author(s):  
Abdolkarim Zare ◽  
Alireza Hasaninejad ◽  
Abolfath Parhami ◽  
Ahmad Moosavi-Zare ◽  
Fatemeh Khedri ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Microwave Irradiation ◽  
Reaction Times ◽  
Efficient Catalyst ◽  
Neutral Reaction ◽  
Catalyst Free ◽  
Quinoxaline Derivatives ◽  
Reaction Media

Quinoxaline derivatives were produced in excellent yields and short reaction times via the condensation of 1,2-diamines with 1,2-diketones in the neutral ionic liquid 1-butyl-3-methylimidazolium bromide ([bmim]Br) under catalyst-free and microwave irradiation conditions.

A catalyst-free protocol for the green and efficient condensation of indoles with aldehydes in ionic liquids

2009 ◽  
Vol 87 (2) ◽  
pp. 416-421 ◽  
Author(s):  
Abdolkarim Zare ◽  
Abolfath Parhami ◽  
Ahmad Reza Moosavi-Zare ◽  
Alireza Hasaninejad ◽  
Ali Khalafi-Nezhad ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Microwave Irradiation ◽  
Reaction Times ◽  
Aliphatic Aldehydes ◽  
Catalyst Free

Indoles are efficiently condensed with aromatic and aliphatic aldehydes in the absence of any catalyst in ionic liquid 1-butyl-3-methylimidazolium bromide {bmim]Br} under microwave irradiation to afford bis(indolyl)methanes in good to excellent yields and in short reaction times.

Preparation and Characterization of a Novel Room Temperature Dicationic Ionic Liquid and its Application in the Synthesis of Xanthenediones Under Solvent-Free Conditions

2018 ◽  
Vol 21 (8) ◽  
pp. 602-608 ◽  
Author(s):  
Zainab Ehsani-Nasab ◽  
Ali Ezabadi
Keyword(s):  
Ionic Liquid ◽  
Room Temperature ◽  
Reaction Times ◽  
Significant Loss ◽  
Solvent Free ◽  
Acidity Function ◽  
Efficient Catalyst ◽  
Solvent Free Conditions ◽  
Hammett Acidity Function ◽  
Dicationic Ionic Liquid

Aim and Objective: In the present work, 1, 1’-sulfinyldiethylammonium bis (hydrogen sulfate) as a novel room temperature dicationic ionic liquid was synthesized and used as a catalyst for xanthenediones synthesis. Material and Method: The dicationic ionic liquid has been synthesized using ethylamine and thionyl chloride as precursors. Then, by the reaction of [(EtNH2)2SO]Cl2 with H2SO4, [(EtNH2)2SO][HSO4]2 was prepared and after that, it was characterized by FT-IR, 1H NMR, 13C NMR as well as Hammett acidity function. This dicationic ionic liquid was used as a catalyst for the synthesis of xanthenediones via condensation of structurally diverse aldehydes and dimedone under solvent-free conditions. The progress of the reaction was monitored by thin layer chromatography (ethyl acetate/n-hexane = 3/7). Results: An efficient solvent-free method for the synthesis of xanthenediones has been developed in the presence of [(EtNH2)2SO][HSO4]2 as a powerful catalyst with high to excellent yields, and short reaction times. Additionally, recycling studies have demonstrated that the dicationic ionic liquid can be readily recovered and reused at least four times without significant loss of its catalytic activity. Conclusion: This new dicationic ionic liquid can act as a highly efficient catalyst for xanthenediones synthesis under solvent-free conditions.

scholarly journals Regioselective Copper-Catalysed Amination of Halobenzoic Acids using Aromatic Amines

2007 ◽  
Vol 2007 (10) ◽  
pp. 587-589 ◽  
Author(s):  
Mohan Babu Maradolla ◽  
Amaravathi Mandha ◽  
Chandra Mouli Garimella
Keyword(s):  
Microwave Irradiation ◽  
Aromatic Amines ◽  
Reaction Times ◽  
Efficient Catalyst ◽  
High Yields

Copper dipyridine dichloride (CuPy2Cl2) has been found to be an efficient catalyst for the synthesis of N-arylanthranilic acids from ortho halobenzoic acids and aromatic amines under microwave irradiation. Some of the advantages of this method are high chemoselectivity, ease of operation, less reaction times and high yields. (61–98%).

Synthesis of N-alkyl pyrroles via decarboxylation/dehydration in neutral ionic liquid under catalyst-free conditions

RSC Advances ◽  
2014 ◽  
Vol 4 (101) ◽  
pp. 57587-57590 ◽  
Author(s):  
Veena D. Yadav ◽  
Shashikant U. Dighe ◽  
Sanjay Batra
Keyword(s):  
Ionic Liquid ◽  
Microwave Irradiation ◽  
Aliphatic Aldehydes ◽  
Catalyst Free

A catalyst-free benign route toN-alkyl pyrroles by reacting aromatic, heteroaromatic or aliphatic aldehydes with 4-hydroxyproline in neutral ionic liquid under microwave irradiation is presented.

A Suitable One-Pot Synthesis of 3,4-Dihydropyrano[3,2-c]Chromenes Using Magnetic Nanoparticles Tag: Piperidinium Benzene-1,3-Disulfonate Ionic Liquid as a Novel, Green, Efficient and Reusable Catalyst in Aqueous Medium

2017 ◽  
Vol 14 (6) ◽  
pp. 904-911 ◽  
Author(s):  
Ramin Ghorbani-Vaghei ◽  
Jafar Mahmoodi ◽  
Yaser Maghbooli ◽  
Azadeh Shahriari
Keyword(s):  
Ionic Liquid ◽  
Magnetic Nanoparticles ◽  
Reaction Times ◽  
Catalytic Amount ◽  
High Yield ◽  
Reusable Catalyst ◽  
One Pot ◽  
Efficient Catalyst ◽  
Water Solvent ◽  
The One

Background: The synthesis of 3,4-dihydropyrano[3,2-c]chromenes via the one-pot three-component reactions of various aldehydes, malononitrile, and 4-hydroxycumarin at 60 °C in water as a solvent by the magnetic nanoparticles tag: piperidinium benzene-1,3-disulfonate ionic liquid as a green and efficient catalyst. Some benefits of the presented technique are significant cost impact, impressive catalysis and the ability to reuse of the catalyst. The current procedure offers high yield, short reaction times, neat reaction and simple reusable catalyst. Objective: A magnetic nanoparticles tag: piperidinium benzene-1,3-disulfonate ionic liquid as a green, efficient, reusable and heterogeneous catalyst was used for the synthesis of 3,4-dihydropyrano[3,2-c]chromenes. Method: We have described an efficient and green process for the synthesis of the one-pot three-component synthesis of 3,4-dihydropyrano[3,2-c]chromenes from the reaction between 4-hydroxy-coumarin with malononitrile and aldehydes in the presence of catalytic amount of magnetic nanoparticles tag: piperidinium benzene-1,3-disulfonate ionic liquid as a novel and powerful nano ionic liquid with good to excellent yields and in a short reaction time in water solvent at 60 °C. Result: The main advantage of this process is the simplicity of the work-up and the products can be isolated without chromatography. Conclusion: We suggest that the method has also various additional advantages such as low loading of catalyst, clean reaction, which makes it a suitable and noteworthy approach for the synthesis of 3,4- dihydropyrano[3,2-c]chromenes.

Green Biodiesel Production Catalyzed by Basic Ionic Liquid

2013 ◽  
Vol 291-294 ◽  
pp. 379-382 ◽  
Author(s):  
Yong Gang Guo ◽  
Bao Hua Huang ◽  
Na Shi ◽  
Xiao Zhong Ma ◽  
Yan Ping Huo ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Microwave Irradiation ◽  
Processing Time ◽  
Biodiesel Production ◽  
Efficient Catalyst ◽  
Basic Ionic Liquid ◽  
Alkyl Side Chains ◽  
Biphasic Systems ◽  
Operational Simplicity

Transesterification were carried out under microwave irradiation conditions and the effects of imidazolium hydroxide with different branched alkyl side-chains ([Cnmim]OH, n = 2, 3, 4) were investigated. The results showed that less than conventional amount of NaOH, and the alkaline ionic liquids formed clearly biphasic systems immediately after the transesterification of soybean oil with methanol was finished. The method offers significant improvement over conventional techniques in terms of operational simplicity, processing time reduction and excellent yields. Among the imidazolium salts studied, [C2mim]OH proved to be the most efficient catalyst, affording 96 % yield.

scholarly journals Microwave-Accelerated N-Acylation of Sulfoximines with Aldehydes under Catalyst-Free Conditions

Synthesis ◽  
2020 ◽  
Vol 52 (08) ◽  
pp. 1279-1286
Author(s):  
Kamal K. Rajbongshi ◽  
Srinivas Ambala ◽  
Thavendran Govender ◽  
Hendrik G. Kruger ◽  
Per I. Arvidsson ◽  
...  
Keyword(s):  
Free Radical ◽  
Microwave Irradiation ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Aromatic Aldehydes ◽  
Efficient Catalyst ◽  
Radical Initiator ◽  
Catalyst Free ◽  
Broad Scope ◽  
Cross Coupling Reaction

An efficient catalyst-free radical cross-coupling reaction between aromatic aldehydes and sulfoximines was developed. The reaction took place in the presence of N-bromosuccinimide as the radical initiator under microwave irradiation to afford the corresponding acylated sulfoximines in moderate to excellent yields (27 examples). This protocol proved to be rapid, easy to handle, and applicable to a broad scope of substrates.

scholarly journals A Novel Composite of Ionic Liquid-containing Polymer and Metal-organic Framework as an Efficient Catalyst for Ultrasonic-assisted Knoevenagel Condensation

2021 ◽  
Author(s):  
Samahe Sadjadi ◽  
Fatemeh Koohestani ◽  
Majid M. Heravi
Keyword(s):  
Ionic Liquid ◽  
Knoevenagel Condensation ◽  
Metal Organic Framework ◽  
Reaction Times ◽  
Elemental Mapping ◽  
Efficient Catalyst ◽  
Ultrasonic Assisted ◽  
Metal Organic ◽  
High Yields ◽  
Organic Framework

Abstract 1-Butyl-3-vinylimidazolium chloride was synthesized and polymerized with acrylamide to furnish an ionic liquid-containing polymer, which was then used for the formation of a composite with iron-based metal-organic framework. The resultant composite was characterized with XRD, TGA, FE-SEM, FTIR, EDS and elemental mapping analyses and its catalytic activity was appraised for ultrasonic-assisted Knoevenagel condensation. The results confirmed that the prepared composite could promote the reaction efficiently to furnish the corresponding products in high yields in very short reaction times. Moreover, the composite exhibited high recyclability up to six runs. It was also established that the activity of the composite was higher compared to pristine metal-organic framework or polymer.

scholarly journals [DBN][HSO4]-Promoted facile and green synthesis of 2-Amino-4H-pyrans derivatives under microwave irradiation

2021 ◽  
Vol 11 (2-S) ◽  
pp. 89-97
Author(s):  
Vishal Mane ◽  
Dhanjay Mane
Keyword(s):  
Ionic Liquid ◽  
Microwave Irradiation ◽  
Room Temperature ◽  
Knoevenagel Condensation ◽  
Reaction Times ◽  
Environmentally Benign ◽  
Successive Reaction ◽  
Solvent Free Conditions ◽  
High Yields ◽  
First Time

The [DBN][HSO4] -promoted Knoevenagel condensation followed by cyclization protocol has been developed for the first time by a successive reaction of aldehydes, dimedone and malononitrile to afford 2-Amino-4H-pyrans derivatives in high to excellent yields at room temperature. The synergic couple of microwave and ionic liquid provided the capability to allow a variability of functional groups, short reaction times, easy workup, high yields, recyclability of the catalyst, and solvent-free conditions, thus providing economic and environmental advantages. Keywords: [DBN][HSO4], Environmentally benign, 2-Amino-4H-pyrans, Knoevenagel condensation, Microwave irradiation

Sign in / Sign up

Export Citation Format

Share Document