Supramolecular β-cyclodextrin as a Biodegradable and Reusable Catalyst Promoted Environmentally Friendly Synthesis of Pyrano[2,3-d]pyrimidine Scaffolds via Tandem Knoevenagel–Michael–Cyclocondensation Reaction in Aqueous Media

2020 ◽  
pp. 1-10
Author(s):  
Farzaneh Mohamadpour
Keyword(s):  
Aqueous Media ◽  
Environmentally Friendly ◽  
Reusable Catalyst ◽  
Cyclocondensation Reaction

Environmentally friendly cyclotrimerization of substituted acetophenones catalyzed by a new nanocomposite of γ-Al2O3 nanoparticles decorated with H5PW10V2O40

RSC Advances ◽  
2016 ◽  
Vol 6 (60) ◽  
pp. 55319-55326 ◽  
Author(s):  
Reza Tayebee ◽  
Kokab Savoji ◽  
Maryam Kargar Razi ◽  
Behrooz Maleki
Keyword(s):  
Environmentally Friendly ◽  
Solvent Free ◽  
Reusable Catalyst ◽  
Al2o3 Nanoparticles ◽  
Solvent Free Conditions

An efficient protocol for the synthesis of C3-symmetrical 1,3,5-triarylbenzenes under solvent-free conditions. γ-Al2O3/H5PW10V2O40 nanocomposite is introduced as a highly reusable catalyst.

scholarly journals DABCO Catalyzed Synthesis of Xanthene Derivatives in Aqueous Media

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Pradeep Paliwal ◽  
Srinivasa Rao Jetti ◽  
Anjna Bhatewara ◽  
Tanuja Kadre ◽  
Shubha Jain
Keyword(s):  
Reaction Time ◽  
Aqueous Media ◽  
Environmentally Friendly ◽  
The Other ◽  
Short Reaction Time ◽  
Xanthene Derivatives ◽  
Reaction Proceeds ◽  
Conventional Methods

The reaction of 5,5-dimethylcyclohexane-1,3-dione with various heteroarylaldehydes afforded the corresponding heteroaryl substituted xanthene derivatives 1(a–f). The reaction proceeds via the initial Knoevenagel, subsequent Michael, and final heterocyclization reactions using 1,4-diazabicyclo[2.2.2]octane (DABCO) as a catalyst in aqueous media. The synthesized heteroaryl substituted xanthenes 1(a–f) reacted with malononitrile to obtain different alkylidenes 2(a–f). Short reaction time, environmentally friendly procedure, avoiding of cumbersome apparatus, and excellent yields are the main advantages of this procedure which makes it more economic than the other conventional methods.

Zinc—Proline Complex: An Efficient, Reusable Catalyst for Direct Nitroaldol Reaction in Aqueous Media.

ChemInform ◽  
2007 ◽  
Vol 38 (45) ◽  
Author(s):  
K. Rajender Reddy ◽  
C. V. Rajasekhar ◽  
G. Gopi Krishna
Keyword(s):  
Aqueous Media ◽  
Reusable Catalyst ◽  
Nitroaldol Reaction

Study on the synthesis of thioamides from aldehyde N-tert-butylsulfinyl amide and sulfur in aqueous media

2021 ◽  
pp. 54-60
Author(s):  
Pham Xuan Thao
Keyword(s):  
Organic Chemistry ◽  
Metal Complex ◽  
Organic Synthesis ◽  
Noble Metal ◽  
High Temperatures ◽  
Bioactive Compounds ◽  
Plant Protection ◽  
Aqueous Media ◽  
Environmentally Friendly ◽  
Straightforward Method

Thioamides have been widely used in the fields of medicine and organic chemistry, some of which are essential bioactive compounds, plant protection agents, and drugs. It could also be used as a vulcanizing agent, an additive to lubricants and greases, and a ligand in organic synthesis. Usually, thioamide is synthesized at high temperatures or in the microwave using an expensive noble metal complex as catalysts. This paper presented a straightforward method for synthesizing thioamides by using N-tert-butylsulfinyl amide, aldehyde, and sulfur. The reaction was carried out in water, which is an environmentally friendly solvent. The reaction selectivity and yield were up to 89%.

p-Toluenesulfonic Acid Coated Natural Phosphate as an Efficient Catalyst for the Synthesis of 2-Substituted Benzimidazole

2018 ◽  
Vol 42 (12) ◽  
pp. 614-617
Author(s):  
Soumia Belkharchach ◽  
Hanane Elayadi ◽  
Hana Ighachane ◽  
Said Sebti ◽  
Mustapha Ait Ali ◽  
...  
Keyword(s):  
Environmentally Friendly ◽  
Catalytic Amount ◽  
Reusable Catalyst ◽  
Efficient Catalyst ◽  
Natural Phosphate ◽  
Mild Conditions ◽  
Toluenesulfonic Acid ◽  
High Yields

2-Substituted benzimidazoles are selectively synthesised in high yields via the condensation of o-phenylenediamine derivatives with aldehyde derivatives using catalytic amount of p-toluenesulfonic acid coated natural phosphate (NP/PTSA) under mild conditions. The use of NP/PTSA as a reusable catalyst makes this process simple, convenient, and environmentally friendly.

scholarly journals Indion 190 resin: efficient, environmentally friendly, and reusable catalyst for synthesis of benzimidazoles, benzoxazoles, and benzothiazoles

2012 ◽  
Vol 5 (2) ◽  
pp. 139-145 ◽  
Author(s):  
Vikas S. Padalkar ◽  
Vinod D. Gupta ◽  
Kiran R. Phatangare ◽  
Vikas S. Patil ◽  
Prashant G. Umape ◽  
...  
Keyword(s):  
Environmentally Friendly ◽  
Reusable Catalyst
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