Friedlander synthesis of novel benzopyranopyridines in the presence of chitosan as heterogeneous, efficient and biodegradable catalyst under solvent-free conditions

2013 ◽  
Vol 37 (5) ◽  
pp. 1595 ◽  
Author(s):  
Zeba N. Siddiqui ◽  
Kulsum Khan
Keyword(s):  
Solvent Free ◽  
Solvent Free Conditions ◽  
Friedlander Synthesis

Dowex-50W Promoted Friedländer Synthesis of Substituted Quinolines under Solvent-Free Conditions

Heterocycles ◽  
2011 ◽  
Vol 83 (2) ◽  
pp. 331 ◽  
Author(s):  
Huey-Min Wang ◽  
Ling-Ching Chen ◽  
Rei-Sheu Hou ◽  
Hau-Dung Du ◽  
Iou-Jiun Kang
Keyword(s):  
Solvent Free ◽  
Solvent Free Conditions ◽  
Substituted Quinolines ◽  
Friedlander Synthesis

scholarly journals Highly efficient one-pot tandem Friedlander annulation and chemo-selective Csp3–H functionalization under calcium catalysis

RSC Advances ◽  
2017 ◽  
Vol 7 (31) ◽  
pp. 18874-18882 ◽  
Author(s):  
Garima Singh ◽  
Srinivasarao Yaragorla
Keyword(s):  
Solvent Free ◽  
One Pot ◽  
Highly Efficient ◽  
Solvent Free Conditions ◽  
Friedlander Synthesis ◽  
First Time ◽  
Calcium Catalysis

Highly efficient and regioselective Friedlander synthesis of 2-methyl-3-acyl quinolines and their chemoselective Csp3–H functionalization is described for the first time using Ca(OTf)2 as the sustainable catalyst under solvent free conditions with atom and step economy.

Withdrawal Notice: Recent Advances in Sonogashira Cross-Coupling Reactions Under Solvent-Free Conditions

2020 ◽  
Vol 24 ◽  
Author(s):  
Teng Wang ◽  
Zongrui Liu ◽  
Songlin Wang ◽  
Esmail Vessally
Keyword(s):  
Organic Chemistry ◽  
Editorial Policy ◽  
Cross Coupling ◽  
Solvent Free ◽  
Coupling Reactions ◽  
Editorial Policies ◽  
Cross Coupling Reactions ◽  
Recent Advances ◽  
Solvent Free Conditions ◽  
Copyright Permission

The article has been withdrawn at the request of editor of the journal Current Organic Chemistry: Bentham Science apologizes to the readers of the journal for any inconvenience this may have caused. The Bentham Editorial Policy on Article Withdrawal can be found at https://benthamscience.com/editorial-policies-main.php BENTHAM SCIENCE DISCLAIMER: It is a condition of publication that manuscripts submitted to this journal have not been published and will not be simultaneously submitted or published elsewhere. Furthermore, any data, illustration, structure or table that has been published elsewhere must be reported, and copyright permission for reproduction must be obtained. Plagiarism is strictly forbidden, and by submitting the article for publication the authors agree that the publishers have the legal right to take appropriate action against the authors, if plagiarism or fabricated information is discovered. By submitting a manuscript, the authors agree that the copyright of their article is transferred to the publishers if and when the article is accepted for publication.

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.

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.

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