scholarly journals Ultrasound-Assisted, ZnCr2O4 Nanocatalyzed Synthesis of Substituted Tetrahydroquinolines via Povarov Reaction

2021 ◽  
Vol 11 (4) ◽  
pp. 4080-4088
Keyword(s):  
Ultrasonic Irradiation ◽  
Aromatic Aldehydes ◽  
Atom Economy ◽  
Reaction Route ◽  
Biological Potential ◽  
Povarov Reaction ◽  
Ultrasound Assisted

Eco-friendly, reusable ZnCr2O4 Nano catalyzed tetrahydroquinoline derivatives are prepared via Povarov reaction route from aromatic aldehydes, α-amino naphthalene, and 2,3-dihydrofuran under reflux/ultrasonic irradiation methods. This several affords several benefits like good to excellent yields, a higher percentage of atom economy. Substituted tetrahydroquinolines have been shown great biological potential.

Ultrasound-Assisted Oxidative Desulfurization of Diesel Fuel in H2O2/Heteropoly Acid/Solvent System

2014 ◽  
Vol 1033-1034 ◽  
pp. 85-89 ◽  
Author(s):  
Guo Xian Yu ◽  
Qian Zhong ◽  
Mei Jin ◽  
Ping Lu
Keyword(s):  
Sulfur Content ◽  
Ultrasonic Irradiation ◽  
Diesel Fuel ◽  
Oxidation Reaction ◽  
Heteropoly Acid ◽  
Oxidative Desulfurization ◽  
Solvent System ◽  
Oxidative Reaction ◽  
Solvent Systems ◽  
Ultrasound Assisted

Ultrasound-assisted oxidative desulfurization (UAODS) of diesel fuel in H2O2/Heteropoly acid/Solvent systems, was investigated. Effects of solvent, catalyst, ultrasound and reaction temperature on the oxidation desulfurization of diesel fuel were investigated. When MPA/oil was 2%wt, methanol/diesel fuel was 20%wt, ultrasound power was 400 W and ultrasound time was 10 min, the sulfur content of diesel fuel was decreased from 211 ppm to 19 ppm. The use of ultrasonic irradiation in H2O2/Heteropoly acid/Solvent system significantly improved the efficiency of the oxidation reaction, and solvent was helpful to make the oxidative reaction happen in the same one phase.

scholarly journals One pot synthesis of 3, 4-dihydropyrimidine-2(1H)-thiones using orange peel powder under ultrasonic irradiation

2020 ◽  
Vol 9 (1) ◽  
pp. 919-923
Keyword(s):  
Reaction Time ◽  
Ultrasonic Irradiation ◽  
Heterocyclic Compounds ◽  
Multicomponent Reactions ◽  
Orange Peel ◽  
Biologically Active ◽  
High Yield ◽  
Atom Economy ◽  
One Pot ◽  
The Past

Biginelli, an important multicomponent reaction provides an avenue for the synthesis of different biologically active heterocyclic compounds. During the past decade, one pot multicomponent reactions have attracted the attention of organic and medicinal chemists due to high atom economy, time and enery saving convergent nature. The present manuscript reports a simple one pot three component synthesis of 3, 4-dihydroprimidin-2(1H)-thiones from various diversely substituted aldehydes, ethyl acetoacetate and thiourea using a orange peel powder as a natural catalyst on ultrasonic irradiation in aqueous medium as the solvent. The advantages of this reaction are less reaction time, high yield, easy availability of the catalyst and green nature.

scholarly journals Zn(L-proline)2: An efficient and reusable organocatalyst for the synthesis of polyfunctionally substituted pyrans and 2-amino-4-aryl-8-oxo-4,8-dihydropyrano[3,2-b]pyran derivatives

2019 ◽  
Vol 10 (2) ◽  
pp. 166-170 ◽  
Author(s):  
Fatma Ahmed Abo Elsoud ◽  
Mohamed Abd-Elmonem ◽  
Mohamed Abo Elsebaa ◽  
Kamal Usef Sadek
Keyword(s):  
Kojic Acid ◽  
Aromatic Aldehydes ◽  
Efficient Synthesis ◽  
Atom Economy ◽  
Short Reaction Time ◽  
Biologically Relevant ◽  
Three Component Reaction ◽  
High Yields ◽  
Organometallic Catalyst ◽  
Work Up

Efficient synthesis of non-annulated 2-amino-4H-pyrans and 2-amino-8-oxo-4,8-dihydropyrano[3,2-b]pyran derivatives, which are biologically relevant heterocycles is achieved, utilizing a domino three-component reaction of ethyl acetoacetate or kojic acid with aromatic aldehydes and malononitrile catalyzed by Zn(L-proline)2 as reusable organometallic catalyst. The process exhibits high atom economy, short reaction time, simple work up, high yields and environmentally friendly nature. Excellent yields of the targeted molecules have been obtained.

scholarly journals Ultrasound assisted synthesis of a Zn(ii) metal–organic framework with nano-plate morphology using non-linear dicarboxylate and linear N-donor ligands

RSC Advances ◽  
2014 ◽  
Vol 4 (88) ◽  
pp. 47894-47898 ◽  
Author(s):  
Mohammad Yaser Masoomi ◽  
Ali Morsali ◽  
Peter C. Junk
Keyword(s):  
Ultrasonic Irradiation ◽  
Metal Organic Framework ◽  
Donor Ligands ◽  
Non Linear ◽  
Metal Organic ◽  
Ultrasound Assisted ◽  
Plate Morphology ◽  
Organic Framework

Nano-plates of TMU-4 were obtained upon ultrasonic irradiation.

scholarly journals Facile synthesis of functionalized tetrahydroquinolines via domino Povarov reactions of arylamines, methyl propiolate and aromatic aldehydes

2012 ◽  
Vol 8 ◽  
pp. 1839-1843 ◽  
Author(s):  
Jing Sun ◽  
Hong Gao ◽  
Qun Wu ◽  
Chao-Guo Yan
Keyword(s):  
Aromatic Aldehydes ◽  
Domino Reaction ◽  
Facile Synthesis ◽  
Methyl Propiolate ◽  
Toluenesulfonic Acid ◽  
Povarov Reaction

In the presence of p-toluenesulfonic acid as catalyst the domino reaction of arylamines, methyl propiolates and aromatic aldehydes in ethanol proceeded smoothly to give polysubstituted 1,2,3,4-tetrahydroquinolines in moderate yields. The reaction is believed to involve the Povarov reaction of in situ generated β-enamino ester with the in situ formed aromatic imine.

Ultrasound-assisted rapid synthesis of β-aminoketones with direct-type catalytic Mannich reaction using bismuth(III) triflate in aqueous media at room temperature

2012 ◽  
Vol 66 (1) ◽  
Author(s):  
S. Ozturkcan ◽  
Kadir Turhan ◽  
Zuhal Turgut
Keyword(s):  
Reaction Time ◽  
Mannich Reaction ◽  
Aromatic Amines ◽  
Room Temperature ◽  
Aqueous Media ◽  
Aromatic Aldehydes ◽  
Rapid Synthesis ◽  
Low Toxicity ◽  
Ultrasound Assisted ◽  
Easy Operation

AbstractAn innovative, powerful, efficient and relatively rapid method was developed to synthesise various β-aminoketone derivatives from cyclohexanone, substituted aromatic amines and aromatic or hetero-aromatic aldehydes via ultrasound-assisted direct-type catalytic Mannich reaction using bismuth(III) triflate in water. Good yields of the desired β-aminoketones were obtained at room temperature by ultrasound-assisted reaction within 1–2 h. The major advantages of the proposed method are undemanding conditions, easy operation, low toxicity, shorter reaction time, anti selectivity and higher yields in comparison with conventional methods.

scholarly journals Ultrasound-Assisted Method for the Synthesis of Tertiary Fatty Aliphatic Esters with Potential Antimicrobial Activity

2020 ◽  
Vol 10 (6) ◽  
pp. 6829-6836
Keyword(s):  
Fatty Acid ◽  
Reaction Time ◽  
Conventional Method ◽  
Ultrasonic Irradiation ◽  
Spectroscopic Studies ◽  
Fatty Acid Esters ◽  
Aliphatic Esters ◽  
Ultrasound Assisted ◽  
The Impact ◽  
Acid Esters

This study aims to demonstrate a simple and rapid “green” method for the ultrasound-assisted synthesis of t-aliphatic esters by reacting t -butanol with saturated (capric, lauric, palmitic) and unsaturated (oleic and undecylenic) acids. The spectral characterization of esters was performed by IR and NMR spectroscopies. The impact of ultrasonic irradiation on the reaction in comparison with the conventional method was analyzed based on the reaction time and the yield of the resulting esters. After spectroscopic studies, the synthesis of the corresponding esters after the ultrasound-assisted irradiation was proven. The yields of the t-butyl fatty acid esters increased between 2 and 10% in comparison with the conventional method for their synthesis. It was also established that the application of ultrasonic irradiation intensifies the esterification process significantly compared to the conventional method. The advantages of the ultrasound-assisted esterification include shortening the reaction time; the process is carried out at room temperature instead of at the conventional reaction temperature 67-70oC. The application of ultrasonic-assisted irradiation for esterification is a suitable and promising method to reduce energy consumption, shortening the reaction time, and increasing the yield of t -butyl fatty acid esters.

Sign in / Sign up

Export Citation Format

Share Document