Green and efficient synthesis of 1, 2, 4-Triazolidine-3-thiones using guanidine hydrochloride as a recyclable catalyst under the aqueous condition

2022 ◽  
Vol 19 ◽  
Author(s):  
Angad B. Barkule ◽  
Yatin U. Gadkari ◽  
Vikas N. Telvekar
Keyword(s):  
Energy Efficiency ◽  
Catalytic Activity ◽  
Reaction Time ◽  
Guanidine Hydrochloride ◽  
Catalytic Amount ◽  
Significant Loss ◽  
Recyclable Catalyst ◽  
Efficient Synthesis ◽  
Aryl Aldehydes ◽  
Work Up

Abstract: A rapid and highly efficient methodology for the synthesis of 1, 2, 4-Triazolidine-3-thiones derivatives has been developed in the presence of a catalytic amount of guanidine hydrochloride using water as a solvent. The reaction of thiosemicarbazide with different aryl aldehydes resulted in the formation of title compounds in good yields (85% -95%) with a convenient reaction time (20-30 min). The key advantages of this approach are shorter reaction time, energy efficiency, easy work-up procedure, and wide substrate scope tolerance. Further, the catalyst was recycled without significant loss of its catalytic activity

An efficient synthesis of naphtho[2,1-b]furan-2(1H)-ones catalysed by Nafion-H supported on silica-coated super paramagnetic iron oxide nanoparticles

2017 ◽  
Vol 41 (7) ◽  
pp. 408-412 ◽  
Author(s):  
Mohammad Akrami Abarghooei ◽  
Razieh Mohebat ◽  
Zahed Karimi-Jaberi ◽  
Mohammad Hossein Mosslemin
Keyword(s):  
Catalytic Activity ◽  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Hippuric Acid ◽  
Superparamagnetic Iron Oxide ◽  
Significant Loss ◽  
Oxide Nanoparticles ◽  
Efficient Synthesis ◽  
One Pot ◽  
Aryl Aldehydes

A one-pot procedure is descibed for the synthesis of naphtho[2,1- b]furan-2(1 H)-ones via a multicomponent reaction of aryl aldehydes, hippuric acid, acetic anhydride and β-naphthol in the presence of Nafion-H supported on silica-coated superparamagnetic iron oxide nanoparticles under microwave irradiation. The catalyst can be recovered easily and reused several times without significant loss of catalytic activity.

Efficient Hydrolytic Breakage of β-1,4-Glycosidic Bond Catalyzed by a Difunctional Magnetic Nanocatalyst

2018 ◽  
Vol 71 (8) ◽  
pp. 559 ◽  
Author(s):  
Ren-Qiang Yang ◽  
Ni Zhang ◽  
Xiang-Guang Meng ◽  
Xiao-Hong Liao ◽  
Lu Li ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Reaction Time ◽  
Microcrystalline Cellulose ◽  
Significant Loss ◽  
Reducing Sugar ◽  
Magnetic Nanocatalyst ◽  
Efficient Catalyst ◽  
Glycosidic Bonds ◽  
Hydrolysis Of Cellulose ◽  
Hydrolysis Of

A novel difunctional magnetic nanocatalyst (DMNC) was prepared and used to catalyse the hydrolytic breakage of β-1,4-glycosidic bonds. The functional nanoparticle displayed excellent catalytic activity for hydrolysis of cellobiose to glucose under moderate conditions. The conversion of cellobiose and yield of glucose could reach 95.3 and 91.1 %, respectively, for a reaction time of 6 h at pH 4.0 and 130°C. DMNC was also an efficient catalyst for the hydrolysis of cellulose: 53.9 % microcrystalline cellulose was hydrolyzed, and 45.7 % reducing sugar was obtained at pH 4.0 and 130°C after 10 h. The magnetic catalyst could be recycled and reused five times without significant loss of catalytic activity.

scholarly journals Microwave Assisted One Pot Synthesis of 3,4-Dihydropyrano[c]chromene Derivatives using [Emim]OH Ionic Liquid as Novel Catalyst

2019 ◽  
Vol 31 (4) ◽  
pp. 829-833
Author(s):  
D.S. Bhagat ◽  
S.G. Pande ◽  
M.V. Katariya ◽  
R.P. Pawar ◽  
P.S. Kendrekar
Keyword(s):  
Ionic Liquid ◽  
Reaction Time ◽  
High Yield ◽  
Reaction Conditions ◽  
One Pot ◽  
Short Reaction Time ◽  
Aryl Aldehydes ◽  
Microwave Assisted ◽  
Novel Catalyst ◽  
Work Up

One-pot efficient protocol to the synthesis of 2-amino-5-oxo-4,5-dihydropyrano(3,2-c)chromene-3-carbonitrile derivatives via condensation of various aryl aldehydes, dicyanomethane and 4-hydroxycoumarin in presence of Emim hydroxide as an excellent homogeneous liquid catalyst. The key advantages of this methodology are mild reaction conditions, novel catalyst, short reaction time, eco-friendly, easy work-up procedure and high yield of isolation of derivatives.

A Convenient One-Pot and Rapid Microwave-Assisted Synthesis of Biologically Active s-Triazolo[3,4-b][1,3,4]Thiadiazine and s-Triazolo[3,4-b][1,3,4]Thiadiazole Nanoarchitectonics

2020 ◽  
Vol 20 (5) ◽  
pp. 2917-2929
Author(s):  
Ahmed F. M. EL-Mahdy ◽  
Hassan A. H. EL-Sherief ◽  
Zeinab A. Hozien ◽  
Shiao-Wei Kuo
Keyword(s):  
Acetic Acid ◽  
Sulfuric Acid ◽  
Reaction Time ◽  
Catalytic Amount ◽  
Biologically Active ◽  
Microwave Assisted Synthesis ◽  
One Pot ◽  
Microwave Assisted ◽  
Work Up ◽  
Temperature Time

A rapid and efficient one-pot protocol has been developed for the synthesis of s-triazolo[3,4-b][1,3,4]thiadiazine and s-triazolo[3,4-b][1,3,4]thiadiazole nanoarchitectonics through the reaction of s-triazoles with ketones and nitriles in acetic acid containing a catalytic amount of sulfuric acid under microwave irradiation in excellent yields. With this catalytic reaction, the cheap sulfuric acid as well as other acids were examined as catalysts and the highly toxic and irritating haloketones and halonitriles were avoided to form. The effects of microwave power, temperature, time, solvent and catalyst were examined. This method achieved a better performance; e.g., higher yields, shorter reaction time and easier work-up as compared to other conventional methods. Therefore, the proposed method will be readily applicable to the synthesis of biologically important compounds containing s-triazolo[3,4-b][1,3,4]thiadiazine and s-triazolo[3,4-b][1,3,4]thiadiazole framework.

scholarly journals LiHSO4/SiO2as a New, Efficient and Reusable Catalytic System for the Chemoselective Conversion of Aldehydes to Acylals under Solvent-Free Conditions

2009 ◽  
Vol 6 (s1) ◽  
pp. S390-S396 ◽  
Author(s):  
Abdolkarim Zare ◽  
Alireza Hasaninejad ◽  
Esmael Rostami ◽  
Ahmad Reza Moosavi-Zare ◽  
Maria Merajoddin ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Acetic Anhydride ◽  
Catalytic System ◽  
Catalytic Amount ◽  
Significant Loss ◽  
Solvent Free ◽  
Reaction Conditions ◽  
Highly Efficient ◽  
Solvent Free Conditions

A highly efficient, green and expeditious solvent-free method is described for the chemoselective conversion of aldehydes to the corresponding acylals in excellent yields, using acetic anhydride in the presence of catalytic amount (20 mol%) of silica-supported LiHSO4. Ketones does not react under these reaction conditions. LiHSO4/SiO2can be recovered and reused without any significant loss of its catalytic activity.

Ruthenium(III) acetylacetonate [Ru(acac)3] — An efficient recyclable catalyst for the acetylation of phenols, alcohols, and amines under neat conditions

2007 ◽  
Vol 85 (2) ◽  
pp. 148-152 ◽  
Author(s):  
Ravi Varala ◽  
Aayesha Nasreen ◽  
Srinivas R Adapa
Keyword(s):  
Ambient Temperature ◽  
Catalytic Amount ◽  
Significant Loss ◽  
Recyclable Catalyst ◽  
Solvent Free ◽  
Protecting Groups

A catalytic amount of ruthenium(III) acetylacetonate (2 mol%) [Ru(acac)3] enables solvent-free acetylation of phenols, alcohols, and amines at ambient temperature in good to excellent yields. Furthermore, the catalyst could be recovered and reused at least three times without a significant loss in yields.Key words: acetylation, protecting groups, ruthenium(III) acetylacetonate, phenols, alcohols, amines.

scholarly journals Solvent-Free Preparation of 1,8-Dioxo-Octahydroxanthenes Employing Iron Oxide Nanomaterials

Materials ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2386 ◽  
Author(s):  
Fatemeh Rajabi ◽  
Mohammad Abdollahi ◽  
Elham Sadat Diarjani ◽  
Mikhail G. Osmolowsky ◽  
Olga M. Osmolovskaya ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Iron Oxide ◽  
Reaction Times ◽  
Significant Loss ◽  
Solvent Free ◽  
Product Yields ◽  
Environmentally Sound ◽  
Work Up

In this study, 1,8-dioxo-octahydroxanthenes were prepared employing a simple, effective and environmentally sound approach utilizing an iron oxide nanocatalyst under solventless conditions. The proposed iron oxide nanomaterial exhibited high product yields, short reaction times and a facile work-up procedure. The synthesized catalyst was also found to be highly stable and reusable under the investigated conditions (up to twelve consecutive cycles) without any significant loss in its catalytic activity.

Phenyl boronic acid promoted efficient synthesis of perimidine derivatives under mild condition

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Reaction Time ◽  
Mild Condition ◽  
Boronic Acid ◽  
Catalytic Amount ◽  
Product Yield ◽  
Efficient Synthesis ◽  
Reaction Conditions ◽  
Short Reaction Time ◽  
Good Product ◽  
Phenyl Boronic Acid

Various biologically important perimidines derivatives have been efficiently synthesized in excellent from Napthalene-1,8-diamine and various ketones in presence of a catalytic amount of Phenyl boronic acid. This approach offers many advantages such as good product yield, short reaction time, easy isolation of products and mild reaction conditions.

Application of Triphenylammonium Tricyanomethanide as an Efficient and Recyclable Nanostructured Molten-Salt Catalyst for the Synthesis of N-Benzylidene-2-arylimidazo[1,2-a]pyridin-3-amines

Synlett ◽  
2017 ◽  
Vol 28 (10) ◽  
pp. 1173-1176 ◽  
Author(s):  
Saeed Baghery ◽  
Mohammad Zolfigol ◽  
Romana Schirhagl ◽  
Masoumeh Hasani
Keyword(s):  
Catalytic Activity ◽  
Molten Salt ◽  
Significant Loss ◽  
Solvent Free ◽  
Trimethylsilyl Cyanide ◽  
Aryl Aldehydes ◽  
Solvent Free Conditions

Triphenylammonium tricyanomethanide (Ph3NH)[C(CN)3] was synthesized and used as an efficient and recyclable nanostructured molten-salt (NMS) catalyst for the synthesis of N-benzylidene-2-arylimidazo[1,2-a]pyridin-3-amines by the reaction of various (het)aryl aldehydes with trimethylsilyl cyanide and pyridin-2-amine under solvent-free conditions at 50 °C. The NMS catalyst could be simply recycled and reused several times without significant loss of its catalytic activity.

Controlled Aerobic Oxidation of Primary Benzylic Alcohols to Aldehydes Catalyzed by Polymer-Supported Triazine-Based Dendrimer–Copper Composites

Synlett ◽  
2018 ◽  
Vol 29 (09) ◽  
pp. 1152-1156 ◽  
Author(s):  
Shiguang Pan ◽  
Shuo Yan ◽  
Takao Osako ◽  
Yasuhiro Uozumi
Keyword(s):  
Catalytic Activity ◽  
Ethylene Glycol ◽  
Copper Complexes ◽  
Aerobic Oxidation ◽  
Catalytic Amount ◽  
Significant Loss ◽  
Atmospheric Conditions ◽  
Benzylic Alcohols ◽  
Simple Filtration ◽  
Polymer Supported

A controlled aerobic oxidation of primary benzylic alcohols to the corresponding benzaldehydes by using polystyrene–poly­(ethylene glycol) (PS–PEG) resin-supported triazine-based polyethyleneamine dendrimer–copper complexes [PS–PEG-TD2–Cu(II)] was developed. In particular, PS–PEG-TD2–Cu(OAc)2 efficiently catalyzed the aerobic oxidation of benzylic alcohols in the presence of a catalytic amount of TEMPO under atmospheric conditions to give the corresponding aldehydes in up to quantitative yield. The catalyst was readily recovered by simple filtration and reused four times without significant loss of its catalytic activity.

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