Microwave-promoted Microencapsulated Copper (II) Acetylacetonate: an efficient, environmentally benign and recyclable Green Catalyst for synthesis of Bis(indolyl)methanes

2019 ◽  
Vol 8 (3) ◽  
Keyword(s):  
Environmentally Benign ◽  
Green Catalyst

Tris-hydroxymethylaminomethane (THAM): a novel organocatalyst for a environmentally benign synthesis of medicinally important tetrahydrobenzo[b]pyrans and pyran-annulated heterocycles

2015 ◽  
Vol 39 (6) ◽  
pp. 4452-4463 ◽  
Author(s):  
Kapil S. Pandit ◽  
Pramod V. Chavan ◽  
Uday V. Desai ◽  
Makarand A. Kulkarni ◽  
Prakash P. Wadgaonkar
Keyword(s):  
Low Cost ◽  
Environmentally Benign ◽  
Green Catalyst ◽  
Benign Synthesis

Tris-hydroxymethylaminomethane (THAM): a novel, low cost, green catalyst for the synthesis of medicinally important pyrans and pyran-annulated heterocycles.

scholarly journals Isatin Aldazines Synthesis using A Proton Exchanged Algerian Montmorillonite Clay as Acid Eco-friendly Catalyst

2019 ◽  
Vol 14 (3) ◽  
pp. 551
Author(s):  
Boumadiene Benlahreche ◽  
Assya Taleb ◽  
Mokhtar B. Lahrech ◽  
Salih Hacini
Keyword(s):  
Low Cost ◽  
Aromatic Aldehydes ◽  
Significant Loss ◽  
Montmorillonite Clay ◽  
Environmentally Benign ◽  
Conventional Heating ◽  
Second Step ◽  
Hydrazine Monohydrate ◽  
Green Catalyst ◽  
Benign Process

An efficient and easy procedure is developed for the synthesis of isatin aldazines or bis-Schiff bases of isatin, catalyzed by a proton exchanged Algerian montmorillonite clay (MMT-H+) as green catalyst. The products were obtained in two catalyzed steps under conventional heating in ethanol. Isatin-3-hydrazone obtained from the reaction of isatin with hydrazine monohydrate reacts in the second step with the appropriate aromatic aldehydes to give the desired products in good yields. The main advantages of using this protonated solid non-toxic catalyst in this synthesis are its availability and low cost, the simplicity of its use, the recycling possibilities without significant loss of its catalytic activity and its environmentally benign process. Copyright © 2019 BCREC Group. All rights reserved

Envirocat EPZ-10: An Efficient Catalyst for the Synthesis of 1,2,4- Triazolidine-3-thiones

2020 ◽  
Vol 17 (4) ◽  
pp. 321-326
Author(s):  
Pradeep M. Mhaldar ◽  
Dattaprasad M. Pore
Keyword(s):  
Present Method ◽  
Room Temperature ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Environmentally Benign ◽  
Temperature Synthesis ◽  
Efficient Catalyst ◽  
Green Catalyst ◽  
Catalyst Reusability

A simple and environmentally benign room temperature synthesis of 1,2,4-triazolidine-3- thiones is described using Envirocat EPZ-10R as a solid acid catalyst in the aqueous medium. The use of Envirocat EPZ-10R as a green catalyst, reusability of the catalyst, water as a universal solvent and good yields of the product are the attractive features of the present method.

One Pot Synthesis of Biscoumarins and Pyranocoumarins by Coconut Juice as a Natural Catalyst

2019 ◽  
Vol 6 (1) ◽  
pp. 20-27
Author(s):  
Bipasa Halder ◽  
Himadri S. Maity ◽  
Ahindra Nag
Keyword(s):  
Aromatic Aldehydes ◽  
Environmentally Benign ◽  
One Pot ◽  
Green Catalyst ◽  
One Pot Synthesis ◽  
Volatile Organic ◽  
Electron Withdrawing Group ◽  
Work Up ◽  
Active Methylene ◽  
By Products

Background: The conception of ‘Green chemistry’ is the much inventive chemistry which is potent and more environmentally benign. It is notable that many organic reactions take place in conventional organic solvents, known as volatile organic compounds. Being concerned about the environmental impact, we report a promoting medium, coconut juice (ACC) for one-pot synthesis of biscoumarins and pyranocoumarins which is safe, harmless, green and environmentally benign. Methods and Results: Substituted biscoumarins have been achieved by the reaction of biscoumarin and substituted aromatic aldehydes in presence of ACC which acts as a green catalyst cum solvent. Each reaction showed good to excellent yield in presence of both electron donating as well as electron withdrawing group on aromatic aldehyde without formation of any by-products. Similarly, pyranocoumarins have been achieved by the reaction of biscoumarin, substituted aromatic aldehydes, active methylene nitrile in presence of ACC. All the reactions proceed smoothly and gave higher yields in case of malononitrile in comparison of ethyl-2-cyanoacetate. Conclusion: A simple, eco-friendly and novel procedure was demonstrated for the synthesis of biscoumarins and pyranocoumarins using natural feedstock coconut juice. The major importance of using ACC juice is higher yields, no work-up and no column chromatography.

scholarly journals FeF3 as a green catalyst for the synthesis of dihydropyrimidines via Biginelli reaction

2020 ◽  
Vol 11 (3) ◽  
pp. 206-212
Author(s):  
Thalishetti Krishna ◽  
Eppakayala Laxminarayana ◽  
Dipak Kalita
Keyword(s):  
Thermal Stability ◽  
Functional Group ◽  
Direct Synthesis ◽  
Biginelli Reaction ◽  
Environmentally Benign ◽  
Green Catalyst ◽  
Mild Conditions ◽  
Highly Efficient ◽  
High Acidity ◽  
Water Tolerance

A facile and highly efficient FeF3-catalyzed method has been developed for the direct synthesis of functionalized dihydropyrimidines from readily available starting materials via Biginelli reaction. These reactions proceed at low-catalyst loadings with high functional group tolerance under mild conditions. This method provides efficient reusability of the catalyst and good to excellent yields of the products, making the protocol more attractive, economical, and environmentally benign. FeF3 is an attractive catalyst for the Biginelli reaction because of its high acidity, thermal stability and water tolerance.

scholarly journals AN EFFICIENT, GREEN, CATALYST FREE SYNTHESIS AND CRYSTALLOGRAPHIC STUDY OF BENZO-4H-PYRANS IN AQUEOUS MEDIUM

2019 ◽  
Vol 9 (4-A) ◽  
pp. 280-289
Author(s):  
SEKAR SILAMBU SILAMBARASAN ◽  
A. Jamal Abdul Nasser
Keyword(s):  
Single Crystal ◽  
Aqueous Medium ◽  
Michael Addition ◽  
Aromatic Aldehydes ◽  
Environmentally Benign ◽  
Monoclinic Space Group ◽  
One Pot ◽  
Green Catalyst ◽  
Space Group ◽  
High Yields

A highly efficient and environmentally benign for the synthesis a of 2-amino-7-hydroxy-4-aryl-4H-chromene-3-carbonitrile derivatives (4a-n) in good to high yields (90%-97%) by one-pot three-component Michael addition reaction of malononitrile, aromatic aldehydes and resorcinol under reflux condition was developed in aqueous medium. Single crystal X-ray studies show that 4h crystallizes in the formula C22H15Cl2N2O2, Mr=410.26, Monoclinic, Space group P2(1)/c, a=12.753(9)Å, b=6.665(4)Å, c=24.050(14) Å, β=102.95(3)A° and 4i C16H10Cl2N2O2, Mr=333.16, Triclinic, Space group P-1, a=6.271(3)Å, b=18.697(5)Å, c =13.794(7) Å,  β =94.269(17)A°. The structure of the products were further confirmed by 1H NMR, 13C NMR, IR and Mass spectrum. Keywords: Benzopyrans, malononitrile, resorcinol, Michael addition, water mediated synthesis, single crystal XRD

scholarly journals One-Pot Synthesis of 1,8-Dioxodecahydroacridines and Polyhydroquinoline using 1,3-Di (bromo or chloro)-5,5-Dimethylhydantoin as a Novel and Green Catalyst under Solvent-Free Conditions

2017 ◽  
Vol 57 (4) ◽  
Author(s):  
Behrooz Maleki ◽  
Reza Tayebee ◽  
Mina Kermanian ◽  
Samaneh Sedigh Ashrafi
Keyword(s):  
Ethyl Acetoacetate ◽  
Ammonium Acetate ◽  
Solvent Free ◽  
Environmentally Benign ◽  
One Pot ◽  
Dicarbonyl Compounds ◽  
Green Catalyst ◽  
One Pot Synthesis ◽  
Solvent Free Conditions ◽  
Hantzsch Condensation

Solvent-free, one-pot synthesis of polyhdroquinoline and 1,8-dioxodecahydroacridine derivatives have been described via Hantzsch condensation of various aldehydes, ammonium acetate with (<em>i</em>) cyclic 1,3-dicarbonyl compounds and ethyl acetoacetate and (<em>ii</em>) cyclic 1,3-dicarbonyl compounds (2 mmoles) in a very simple, efficient, and environmentally benign method using 1,3-(dibromo or dichloro)-5,5-dimethylhydantoin as a cheap, non-toxic and neutral catalyst with up to excellent yields.

Hydrotalcite Clay+[TBA][OH] Ionic Liquid Combination for Selective Dihydroquinazolines

2019 ◽  
Vol 6 (1) ◽  
pp. 44-51
Author(s):  
Vivek Srivastava
Keyword(s):  
Ionic Liquid ◽  
Catalytic System ◽  
Ammonium Acetate ◽  
Reaction Pathway ◽  
Aromatic Aldehydes ◽  
Environmentally Benign ◽  
Green Catalyst ◽  
Three Component Reaction ◽  
High Yields ◽  
Operational Simplicity

Background: We are submitting an easy, effective and environmentally benign protocol for the synthesis of 18 different 1,2-dihydroquinazoline derivatives. Methods: We implemented [TMA][OH] ionic liquid mediated hydrotalcite clay catalytic system as a green catalyst to perform this reaction. Results: Three-component reaction pathway was utilized to synthesize 1,2-dihydroquinazoline derivatives using aromatic aldehydes, 2-amino benzophenones, and ammonium acetate with green and recyclable ionic liquid mediated hydrotalcite clay catalytic system. Conclusion: The notable highlights of this method comprise short reaction time, operational simplicity, high yields, and high selectivity. Additionally, the catalyst can be recovered and recycled for up to eight cycles without any loss in catalytic activity.

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