scholarly journals An environmentally benign one-pot synthesis of 1,2-dihydro-1-arylnaphtho[1,2-e][1,3]oxazine-3-one derivatives catalysed by phosphomolybdic acid

2011 ◽  
Vol 76 (1) ◽  
pp. 21-26 ◽  
Author(s):  
Atul Chaskar ◽  
Vimal Vyavhare ◽  
Vikas Padalkar ◽  
Kiran Phatangare ◽  
Hrushikesh Deokar
Keyword(s):  
Aromatic Aldehydes ◽  
Phosphomolybdic Acid ◽  
Environmentally Benign ◽  
One Pot ◽  
One Pot Synthesis ◽  
Three Component Reaction ◽  
Novel Method

A phosphomolybdic acid catalysed novel method for the synthesis of 1,2-dihydro-1-arylnaphtho[1,2-e][1,3]oxazine-3-one derivatives by a one-pot, three-component reaction of ?-naphthol, aromatic aldehydes and urea in excellent yields is described.

CeCl3·7H2O as mild and efficient catalyst for the one-pot multicomponent synthesis of 8-aryl-7,8-dihydro[1,3]dioxolo[4,5-g]chromen-6-ones

2011 ◽  
Vol 76 (4) ◽  
pp. 235-241 ◽  
Author(s):  
Li-Qiang Wu ◽  
Wei-Lin Li ◽  
Fu-Lin Yan
Keyword(s):  
Aromatic Aldehydes ◽  
Environmentally Benign ◽  
Multicomponent Synthesis ◽  
One Pot ◽  
Efficient Catalyst ◽  
Solvent Free Conditions ◽  
Three Component Reaction ◽  
The One ◽  
High Yields ◽  
Work Up

A series of new 8-aryl-7,8-dihydro[1,3]dioxolo[4,5-g]chromen-6-ones were synthesized via a three-component reaction of 3,4-methylenedioxyphenol, aromatic aldehydes and Meldrum’s acid in the presence of CeCl3·7H2O under solvent-free conditions. The method provided several advantages such as easy work-up, high yields and environmentally benign procedure.

scholarly journals Hydrogen peroxide/dimethyl carbonate: a green system for epoxidation of N-alkylimines and N-sulfonylimines. One-pot synthesis of N-alkyloxaziridines from N-alkylamines and (hetero)aromatic aldehydes

2016 ◽  
Vol 18 (18) ◽  
pp. 4859-4864 ◽  
Author(s):  
Jamil Kraïem ◽  
Donia Ghedira ◽  
Thierry Ollevier
Keyword(s):  
Hydrogen Peroxide ◽  
Dimethyl Carbonate ◽  
Aromatic Aldehydes ◽  
Environmentally Benign ◽  
Green Method ◽  
One Pot ◽  
One Pot Synthesis ◽  
Green System

A green method for epoxidation of imines using an environmentally benign oxidant system, H2O2/dimethyl carbonate, was developed.

One-Pot Solvent-and Catalyst-Free Synthesis of Some New Heteroarylaminonaphthoquinones from Lawsone

2021 ◽  
Vol 18 ◽  
Author(s):  
Abolfazl Olyaei ◽  
Nilufar Rahmani ◽  
Mahdieh Sadeghpour ◽  
Amir Mohamadi
Keyword(s):  
Reaction Times ◽  
Aromatic Aldehydes ◽  
Heterocyclic Amines ◽  
Environmentally Benign ◽  
One Pot ◽  
Simple Operation ◽  
Catalyst Free ◽  
Three Component Reaction ◽  
Methyl Naphthalene ◽  
Work Up

: A clean and efficient one-pot protocol for the synthesis of a series of new 2-hydroxy-3-((3-aryl)(heteroarylamino)methyl)naphthalene-1,4-dione derivatives has been developed by the three-component reaction of 2-hydroxynaphthalene-1,4-dione, aromatic aldehydes and heterocyclic amines at 90 oC under solvent and catalyst-free conditions. The procedure avoids the use of toxic solvents, tedious work-up, catalyst and purification of the products by chromatographic methods. Simple operation, short reaction times, generating the desired compounds in high to excellent yields and an environmentally benign method are advantages of this protocol.

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 Trichloroisocyanuric acid, a New and Efficient Catalyst for the Synthesis of 2′- Aminobenzothiazolo-arylmethyl-2-naphthols

2012 ◽  
Vol 9 (4) ◽  
pp. 2424-2428 ◽  
Author(s):  
Limin Yang
Keyword(s):  
Aromatic Aldehydes ◽  
Catalytic Amount ◽  
Solvent Free ◽  
One Pot ◽  
Efficient Catalyst ◽  
One Pot Synthesis ◽  
Solvent Free Conditions ◽  
Three Component Reaction ◽  
Trichloroisocyanuric Acid

An efficient one-pot synthesis of 2′-aminobenzothiazolo-arylmethyl-2-naphthols is described. This involves the three-component reaction ofβ-naphthol, aromatic aldehydes and 2-aminobenzothiazole in the presence of a catalytic amount of trichloroisocyanuric acid under solvent-free conditions.

scholarly journals Scolecite as an efficient heterogeneous catalyst for the synthesis of 2,4,5-triarylimidazoles

2009 ◽  
Vol 7 (3) ◽  
pp. 550-554 ◽  
Author(s):  
Lakshman Gadekar ◽  
Shivshankar Mane ◽  
Santosh Katkar ◽  
Balasaheb Arbad ◽  
Machhindra Lande
Keyword(s):  
Heterogeneous Catalyst ◽  
Ammonium Acetate ◽  
Environmentally Benign ◽  
One Pot ◽  
Effective Catalyst ◽  
One Pot Synthesis ◽  
Three Component Reaction ◽  
The One ◽  
High Yields ◽  
Efficient Heterogeneous Catalyst

AbstractNatural scolecite has been found as an effective catalyst for the one-pot synthesis of 2,4,5-triarylimidazole derivatives via a three component reaction using benzil or benzoin, aldehydes and ammonium acetate. This method provides several advantages such as being environmentally benign, reusable, possessing high yields with increased variations of the substituents in the product and preparative simplicity.

Development of N,N-disulfo-1,1,3,3-tetramethylguanidinium chlorometallates as heterogeneous catalysts for one pot synthesis of 1,2-dihydro-1-aryl-3H-naphth[1, 2-e][1,3]oxazin-3-one derivatives

2020 ◽  
Vol 07 ◽  
Author(s):  
Arup Kumar Dutta ◽  
Ruli Borah ◽  
Kabita Boruah
Keyword(s):  
Heterogeneous Catalysts ◽  
Analytical Techniques ◽  
Aromatic Aldehydes ◽  
One Pot ◽  
Metal Chlorides ◽  
One Pot Synthesis ◽  
Three Component Reaction ◽  
The One ◽  
Acidic Compounds ◽  
Recyclable Heterogeneous Catalyst

Background: Four members of N,N-disulfo-1,1,3,3-tetramethylguanidinium chlorometallates [DSTMG]n[X], where n= 1 or 2; X= FeCl4 - , Zn2Cl6 2-, NiCl4 2-, MnCl4 2- were synthesized as solid Brønsted-Lewis acidic compounds and studied the catalytic activity with the most acidic salt for three-component synthesis of 1,2-dihydro-1-aryl-3H-naphth[1,2- e][1,3]oxazin-3-ones. Methods: N,N-disulfo-1,1,3,3-tetramethylguanidinium chlorometallates of the four transition metal cations such as Fe(III), Zn(II), Ni(II) and Mn(II) were prepared after treatment of the parent ionic liquid N,N-disulfo-1,1,3,3- tetramethylguanidinium chloride [DSTMG][Cl] with the respective metal chlorides in different mole fractions at 75 ºC. The synthesis of 1,2-dihydro-1-aryl-3H-naphth[1,2-e][1,3]oxazin-3-ones was carried out via three-component reaction of 2-naphthol, aromatic aldehydes and urea under neat condition at 90 ºC using 7 mol% of the [DSTMG][FeCl4] catalyst. Results: The characterization of synthesized chlorometallates were done using spectroscopic and other analytical techniques including thermogravimetric analysis and Hammett acidity studies. Among the four salts, the salt of Fe(III) ion was observed as the strong Brønsted acidic hydrophobic salt and thus chosen for the catalytic study. Conclusion: A new type of chlorometallates of guanidinium cation with composition [DSTMG]n[X], where X= FeCl4 - /Zn2Cl6 2-/ NiCl4 2-/ MnCl4 2- and n= 1 or 2 were developed as –SO3H functionalized solid acids with varied thermal stability (150-250 ºC) and physisorbed water (0-20%) as observed from the thermogravimetric study. From them, the most Brønsted acidic Fe(III) salt was employed as efficient recyclable heterogeneous catalyst for the one-pot synthesis of 1,2- dihydro-1-aryl-3H-naphth[1,2-e][1,3]oxazin-3-ones in neat condition.

Al(H2PO4)3 as an efficient and recyclable catalyst for the one-pot synthesis of naphthopyranopyrimidines

RSC Advances ◽  
2015 ◽  
Vol 5 (36) ◽  
pp. 28038-28043 ◽  
Author(s):  
Seyed Sajad Sajadikhah
Keyword(s):  
Aromatic Aldehydes ◽  
Recyclable Catalyst ◽  
One Pot ◽  
One Pot Synthesis ◽  
Three Component Reaction ◽  
The One

An efficient one-pot protocol has been developed for the synthesis of naphthopyranopyrimidine derivatives via a three-component reaction of aromatic aldehydes, β-naphthol and 6-amino-1,3-dimethyl uracil in the presence of Al(H2PO4)3.

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