scholarly journals Molybdenum Oxide Supported on Silica (MoO /SiO ): An Efficient and Reusable Catalyst for the Synthesis of 1,8-dioxodecahydroacridines Under Solvent-free Conditions

2017 ◽  
Vol 59 (1) ◽  
Author(s):  
Amir Khojastehnezhad
Keyword(s):  
Molybdenum Oxide ◽  
Ammonium Acetate ◽  
Reaction Times ◽  
Aromatic Aldehydes ◽  
Solvent Free ◽  
Reusable Catalyst ◽  
Solvent Free Conditions ◽  
High Yields ◽  
Work Up ◽  
Considerable Loss

Silica supported molybdenum oxide (MoO<sub>3</sub>/SiO<sub>2</sub>) was found to be an efficient, eco-friendly and heterogeneous catalyst for the multicomponent reaction of aromatic aldehydes, dimedone and ammonium acetate or aromatic amines under solvent-free conditions to afford the corresponding 1,8-dioxodecahydroacridines  in high yields. The catalyst can be easily recovered and reused for several times without considerable loss of activity. Furthermore, the present method offers several advantages, such as an easy experimental and work-up procedures, short reaction times and good to excellent yields.

scholarly journals A Solvent-Free Protocol for the Green Synthesis of 5-Arylidene-2,4-thiazolidinediones Using Ethylenediamine Diacetate as Catalyst

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Yuliang Zhang ◽  
Zhongqiang Zhou
Keyword(s):  
Knoevenagel Condensation ◽  
Aromatic Aldehydes ◽  
Solvent Free ◽  
Reusable Catalyst ◽  
Efficient Synthesis ◽  
Reaction Conditions ◽  
Solvent Free Conditions ◽  
High Yields ◽  
Work Up ◽  
Solvent Free Reaction

A simple and efficient synthesis of 5-arylidene-2,4-thiazolidinediones by the Knoevenagel condensation of aromatic aldehydes with 2,4-thiazolidinedione catalyzed by ethylenediamine diacetate under solvent-free conditions is described. The major advantages of this method are simple experimental and work-up procedures, solvent-free reaction conditions, small amount of catalyst, short reaction time, high yields, and utilization of an inexpensive and reusable catalyst.

scholarly journals Fe3o4 nanoparticles: A highly efficient and easily reusable catalyst for the one-pot synthesis of xanthene derivatives under solvent-free conditions

2013 ◽  
Vol 78 (6) ◽  
pp. 769-779 ◽  
Author(s):  
Ali Ghasemzadeh ◽  
Javad Safaei-Ghomi ◽  
Safura Zahedi
Keyword(s):  
Fe3o4 Nanoparticles ◽  
Reaction Times ◽  
Aromatic Aldehydes ◽  
Solvent Free ◽  
Reusable Catalyst ◽  
One Pot ◽  
Solvent Free Conditions ◽  
Xanthene Derivatives ◽  
The One ◽  
High Yields

Magnetically separable Fe3O4 nanoparticles supply environmentally friendly procedure for the synthesis of 14-aryl-14H-dibenzo[a,j]xanthene and 1,8-dioxo-octahydro-xanthene derivatives. These compounds were obtained in high yields and short reaction times by the reaction of dimedone and 2-naphthol with various aromatic aldehydes under solvent-free conditions. The catalyst coluld be easily recovered using an external magnet and reused for six cycles with almost consistent activity.

Rapid and Green One-Pot Synthesis of Novel 2-(4-Hydroxy-2-oxo-2H-chromen-3-yl)-2-(arylamino)-1H-indene-1,3(2H)-diones

2021 ◽  
Vol 18 ◽  
Author(s):  
Abolfazl Olyaei ◽  
Zahra Ghahremany ◽  
Madieh Sadeghpour
Keyword(s):  
Aromatic Amines ◽  
Low Cost ◽  
Guanidine Hydrochloride ◽  
Reaction Times ◽  
Solvent Free ◽  
One Pot ◽  
Solvent Free Conditions ◽  
The One ◽  
High Yields ◽  
Work Up

: A green and efficient protocol was developed for the one-pot three-component synthesis of novel 2-(4-hydroxy-2-oxo-2H-chromen-3-yl)-2-(arylamino)-1H-indene-1,3(2H)-dione derivatives by the reaction of 4-hydroxycoumarin, ninhydrin and aromatic amines in the presence of guanidine hydrochloride as an organocatalyst under solvent-free conditions. The present approach offers several advantages such as low cost, simple work-up, short reaction times, chromatography-free purification, high yields and greener conditions.

H3PW12O40 — A selective, environmentally benign, and reusable catalyst for the preparation of methoxymethyl and ethoxymethyl ethers and their deprotections under mild conditions

2008 ◽  
Vol 86 (8) ◽  
pp. 831-840 ◽  
Author(s):  
Iraj Mohammadpoor-Baltork ◽  
Majid Moghadam ◽  
Shahram Tangestaninejad ◽  
Valiollah Mirkhani ◽  
Arsalan Mirjafari
Keyword(s):  
Reaction Times ◽  
Environmentally Benign ◽  
Reusable Catalyst ◽  
Secondary Alcohols ◽  
Selective Protection ◽  
Trimethylsilyl Ethers ◽  
Solvent Free Conditions ◽  
Benzyl Ethers ◽  
High Yields ◽  
Work Up

Different types of primary and secondary alcohols were efficiently transformed to their corresponding methoxymethyl (MOM) and ethoxymethyl (EOM) ethers in the presence of catalytic amounts of H3PW12O40 at room temperature under solvent-free conditions. Selective protection of primary and secondary alcohols in the presence of phenols and tertiary alcohols was achieved by this method. Deprotection of these ethers to their parent alcohols was also performed using this catalyst in ethanol under reflux conditions. We have also found that primary and secondary MOM- and EOM-ethers are selectively deprotected in the presence of phenolic and tertiary ones, methyl and benzyl ethers, esters, and trimethylsilyl ethers by this catalyst. The notable advantages of this protocol are high yields, short reaction times, easy work-up, non-toxicity, easy availability and handling, eco-friendly, and reusability of the catalyst.Key words: methoxymethylation, ethoxymethylation, protection, deprotection, heteropoly acid.

scholarly journals P2O5/SiO2as a New, Efficient and Reusable Catalyst for Preparation of 4,4′-Epoxydicoumarins Under Solvent-free Conditions

2011 ◽  
Vol 8 (4) ◽  
pp. 1626-1631 ◽  
Author(s):  
Liqiang Wu ◽  
Xiao Wang
Keyword(s):  
Silica Gel ◽  
Low Cost ◽  
Reaction Times ◽  
Catalytic Amount ◽  
Phosphorus Pentoxide ◽  
Solvent Free ◽  
Reusable Catalyst ◽  
Solvent Free Conditions ◽  
High Yields

An efficient solvent-free procedure for the preparation of 4,4′-epoxydicoumarins via the ondensation of 4-hydroxycoumarin with aldehydes in the presence of catalytic amount of phosphorus pentoxide/silica gel at 110°C is described. The advantages of this method are generality, high yields, short reaction times, ease of product isolation, low cost and ecologically friendly.

scholarly journals An Efficient and Green Procedure for the Synthesis of 2,4,6-Triarylpyridines Using PPA-SiO2as a Reusable Heterogeneous Catalyst Under Solvent-Free Conditions

2012 ◽  
Vol 9 (4) ◽  
pp. 2037-2043 ◽  
Author(s):  
Abolghasem Davoodnia ◽  
Bahareh Razavi ◽  
Niloofar Tavakoli-Hoseini
Keyword(s):  
Heterogeneous Catalyst ◽  
Simple Procedure ◽  
Substantial Reduction ◽  
Reaction Times ◽  
Solvent Free ◽  
One Pot ◽  
Solvent Free Conditions ◽  
Three Component Reaction ◽  
High Yields ◽  
Work Up

Silica gel-supported polyphosphoric acid (PPA-SiO2) was found to be highly efficient, eco-friendly and recyclable heterogeneous catalyst for the synthesis of 2,4,6-triarylpyridines through one-pot three-component reaction of acetophenone, aryl aldehydes, and ammonium acetate under solvent-free conditions. This method has several advantages, such as simple procedure with an easy work-up, short reaction times, and high yields. Furthermore, the catalyst could be recycled after a simple work-up, and used at least three times without substantial reduction in its catalytic activity.

scholarly journals One-Pot Synthesis of Tetrasubstituted Imidazoles Catalyzed by Preyssler-Type Heteropoly Acid

2011 ◽  
Vol 8 (2) ◽  
pp. 547-552 ◽  
Author(s):  
Ali Javid ◽  
Majid M. Heravi ◽  
F. F. Bamoharram ◽  
Mohsen Nikpour
Keyword(s):  
Heteropoly Acid ◽  
Ammonium Acetate ◽  
Reaction Times ◽  
Acid Catalyst ◽  
Aromatic Aldehydes ◽  
Primary Amines ◽  
One Pot ◽  
High Yields ◽  
Work Up ◽  
Tetrasubstituted Imidazoles

A simple one-pot four-component synthetic method was reported for the preparation of tetrasubstituted imidazole derivatives from benzil, aromatic aldehydes, primary amines and ammonium acetate in the presence of Preyssler-type heteropoly acid catalyst. This method was proved to be eco-benign, easy work-up, convenient, relatively short reaction times and the products were isolated with high yields.

scholarly journals Efficient and solvent-free synthesis of 1-amidoalkyl-2-naphthols using N,N,N’,N’-tetrabromobenzene-1,3-disulfonamide

2010 ◽  
Vol 8 (5) ◽  
pp. 1086-1089 ◽  
Author(s):  
Ramin Ghorbani-Vaghei ◽  
Seyedeh Malaekehpour
Keyword(s):  
Aromatic Aldehydes ◽  
Solvent Free ◽  
Reusable Catalyst ◽  
Efficient Synthesis ◽  
Amidoalkyl Naphthols ◽  
Solvent Free Conditions ◽  
High Yields ◽  
Solvent Free Synthesis

AbstractN,N,N,’N’-Tetrabromobenzene-1,3-disulfonamide [TBBDA] is found to be a reusable catalyst for efficient synthesis of various amidoalkyl naphthols from β-naphthol, aromatic aldehydes and urea in good to high yields under solvent-free conditions.

Coaled Carbon-Based Solid Acid: a New and Efficient Catalyst for Click Synthesis of 3,4-Dihydropyrimidin-2(1H)-Ones under Solvent-Free Conditions

2013 ◽  
Vol 634-638 ◽  
pp. 504-507
Author(s):  
Wan Yi Liu ◽  
Ning Liu ◽  
Rui Yuan Zheng ◽  
Bing Li ◽  
Xia Zhang ◽  
...  
Keyword(s):  
Solid Acid ◽  
Reaction Times ◽  
Solvent Free ◽  
Multicomponent Synthesis ◽  
Efficient Catalyst ◽  
Solvent Free Conditions ◽  
Important Addition ◽  
High Yields ◽  
Work Up ◽  
Carbon Based

Coaled carbon-based solid acid (CCBSAC) is reported as a new, efficient and recyclable catalyst for the regioselective multicomponent synthesis of dihydropyrimidin-2(1H)-ones from aldehydes, β-ketoesters and urea or thiourea under solvent-free conditions. The structure and thermal stability of CCBSAC which resulted from ultra-clean coal resources mainly were characterized by IR, XRD, and TG. Nineteen dihydropyrimidin-2(1H)-ones examples were prepared and this catalyst could recycle up to 4 consecutive runs without losing its efficiency. The high yields of products, short reaction times, ease of work-up and clean procedure will make the present method a useful and important addition to the previous methodologies for the synthesis of dihydropyrimidin-2(1H)-ones.

Synthesis of 3-Aryl-Benzo[b]Furans and 3-Aryl-Naphtho[b]Furans Using N-Propyl-4-Aza-1-Azoniabicyclo[2.2.2]Octane Chloride Immobilised on SiO2 as an Efficient and Reusable Catalyst

2018 ◽  
Vol 42 (2) ◽  
pp. 86-89 ◽  
Author(s):  
Mohammad Akrami Abarghooei ◽  
Razieh Mohebat ◽  
Zahed Karimi-Jaberi ◽  
Mohammad Hossein Mosslemin
Keyword(s):  
Convenient Method ◽  
Reaction Times ◽  
Solvent Free ◽  
Reusable Catalyst ◽  
Solvent Free Conditions ◽  
High Yields

A new and convenient method is describe d for the synthesis of 3-aryl-benzo[ b]furans and 3-aryl-naphtho[ b]furans by the reaction of various α-bromoketones with phenols and 2-naphthols in the presence of n-propyl-4-aza-1-azoniabicyclo[2.2.2]octane chloride immobilised on SiO2. All products were obtained in high yields and short reaction times using solvent-free conditions and a reusable catalyst.

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