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.

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.

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.

1,3-Dibromo-5,5-dimethylhydantoin as a useful reagent for efficient synthesis of 3,4-dihydropyrimidin-2-(1H)-ones under solvent-free conditions

2009 ◽  
Vol 63 (1) ◽  
Author(s):  
Mohammad Abdollahi-Alibeik ◽  
Zahra Zaghaghi
Keyword(s):  
Microwave Irradiation ◽  
Ethyl Acetoacetate ◽  
Biginelli Reaction ◽  
Reaction Times ◽  
Solvent Free ◽  
Efficient Synthesis ◽  
One Pot ◽  
Aliphatic Aldehydes ◽  
Solvent Free Conditions ◽  
High Yields

AbstractEfficient syntheses of 3,4-dihydropyrimidin-2-(1H)-ones and the corresponding thioxo derivatives using 1,3-dibromo-5,5-dimethylhydantoin (DBH) catalysis of a one-pot three-component Biginelli reaction of aldehydes, ethyl acetoacetate, and urea or thiourea under microwave irradiation are described. The advantages of this method are its short reaction times, high yields of the products, inexpensive and commercially available catalyst, and solvent-free conditions. Typical isolated yields exceed 70 % for arylaldehydes (9 examples) and aliphatic aldehydes (2 examples).

An effective and environment-friendly system for Cu NPs@RGO-catalyzed C–C homocoupling of aryl halides or arylboronic acids in ionic liquids under microwave irradiation

RSC Advances ◽  
2016 ◽  
Vol 6 (47) ◽  
pp. 41108-41113 ◽  
Author(s):  
Hongyan Zhao ◽  
Guijie Mao ◽  
Huatao Han ◽  
Jinyi Song ◽  
Yang Liu ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Microwave Irradiation ◽  
Aryl Halides ◽  
Green Solvent ◽  
Environment Friendly ◽  
Arylboronic Acids

Cu NPs@RGO can effectively catalyze Ullmann C–C homocoupling of aryl halides and arylboronic acids under microwave irradiation in green solvent ionic liquid..

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 [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

An Efficient and Ecofriendly Three-Component Reaction for the Rapid Synthesis of 2-Amino-4H-chromenes Catalyzed by a DABCO­-Based Ionic Liquid

Synthesis ◽  
2018 ◽  
Vol 50 (18) ◽  
pp. 3708-3714 ◽  
Author(s):  
Da-Zhen Xu ◽  
Cheng-Bin Li ◽  
Yu-Wei Li
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Michael Reaction ◽  
Reaction Times ◽  
Rapid Synthesis ◽  
Biologically Relevant ◽  
Mild Conditions ◽  
Three Component Reaction ◽  
Green Strategy

An efficient, economical, and green strategy for the construction of biologically relevant 2-amino-4H-chromene scaffolds via a tandem Knoevenagel–Pinner cyclization–Michael reaction has been successfully developed. In the presence of DABCO-based ionic liquids, two different 2-amino-4H-chromene derivatives, 2-amino-4-(indol-3-yl)-4H-chromenes and 2-amino-4-(pyrazol-4-yl)-4H-chromenes, were prepared in good to excellent yields (81–97%) within short reaction times under mild conditions. All the products are purified by simple crystallization. The catalyst could be recycled for at least five times.

scholarly journals Energy efficient microwave synthesis of mesoporous Ce0.5M0.5O2 (Ti, Zr, Hf) nanoparticles for low temperature CO oxidation in an ionic liquid – a comparative study

2015 ◽  
Vol 39 (2) ◽  
pp. 1339-1347 ◽  
Author(s):  
Tarek Alammar ◽  
Ying-Kit Chow ◽  
Anja-Verena Mudring
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Low Temperature ◽  
Microwave Irradiation ◽  
Comparative Study ◽  
Co Oxidation ◽  
Microwave Synthesis ◽  
Energy Efficient ◽  
Low Temperature Co Oxidation

Synthesis of Ce0.5M0.5O2 (M = Ti, Zr, Hf) nanoparticles in ionic liquids by microwave irradiation is an efficient and mild way to obtain efficient catalyts for CO oxidation.

scholarly journals 1-Alkenyl-3-methylimidazolium trifluoromethanesulfonate ionic liquids: novel and low-viscosity ionic liquid electrolytes for dye-sensitized solar cells

RSC Advances ◽  
2018 ◽  
Vol 8 (24) ◽  
pp. 13142-13147 ◽  
Author(s):  
Phuong Tuyet Nguyen ◽  
Trang Ngoc Nguyen ◽  
Vinh Son Nguyen ◽  
Hai Truong Nguyen ◽  
Dung Kim Thi Ngo ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Solar Cells ◽  
Microwave Irradiation ◽  
Dye Sensitized Solar Cells ◽  
Dye Sensitized ◽  
Low Viscosity ◽  
Liquid Electrolytes ◽  
Sensitized Solar Cells

A new series of 1-alkenyl-3-methylimidazolium trifluoromethanesulfonate ionic liquids was prepared under microwave irradiation for application in DSC electrolytes.

scholarly journals New Developments in Material Preparation Using a Combination of Ionic Liquids and Microwave Irradiation

Nanomaterials ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 647 ◽  
Author(s):  
Yannan Wang ◽  
Qidong Hou ◽  
Meiting Ju ◽  
Weizun Li
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Microwave Irradiation ◽  
High Efficiency ◽  
Materials Science ◽  
Synthetic Methods ◽  
Materials Preparations ◽  
Future Research ◽  
Heating Source ◽  
Microwave Assisted

During recent years, synthetic methods combining microwaves and ionic liquids became accepted as a promising methodology for various materials preparations because of their high efficiency and low energy consumption. Ionic liquids with high polarity are heated rapidly, volumetrically and simultaneously under microwave irradiation. Hence, combination of microwave irradiation as a heating source with ionic liquids with various roles (e.g., solvent, additive, template or reactant) opened a completely new technique in the last twenty years for nanomaterials and polymers preparation for applications in various materials science fields including polymer science. This review summarizes recent developments of some common materials syntheses using microwave-assisted ionic liquid method with a focus on inorganic nanomaterials, polymers, carbon-derived composites and biomass-based composites. After that, the mechanisms involved in microwave-assisted ionic-liquid (MAIL) are discussed briefly. This review also highlights the role of ionic liquids in the reaction and crucial issues that should be addressed in future research involving this synthesis technique.

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