scholarly journals Two New 1,1,3,3-Tetramethylguanidinium Halochromates (C5H14N3CrO3X) (X: Cl, F): Efficient Reagents for Oxidation of Organic Substrates under Solvent-Free Conditions and Microwave Irradiation

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Kıvılcım Şendıl ◽  
H. Beytiye Özgün ◽  
Ebru Üstün
Keyword(s):  
Microwave Irradiation ◽  
Carbonyl Compounds ◽  
Solvent Free ◽  
Secondary Alcohols ◽  
Organic Substrates ◽  
Oxidizing Agents ◽  
Solvent Free Conditions ◽  
High Yields

Two new mild oxidizing agents 1,1,3,3-tetramethylguanidinium fluorochromate (TMGFC) and 1,1,3,3-tetramethylguanidinium chlorochromate (TMGCC) were prepared in high yields by reacting tetramethylguanidine with CrO3and related acid. These reagents are suitable to oxidize various primary and secondary alcohols and oximes to the corresponding carbonyl compounds under solvent-free conditions and microwave irradiation.

Uncatalysed Preparation of α-Amino Phosphonates under Solvent Free Conditions

2005 ◽  
Vol 2005 (5) ◽  
pp. 324-327 ◽  
Author(s):  
Mohamed Zahouily ◽  
Abdelhakim Elmakssoudi ◽  
Abdessamad Mezdar ◽  
Ahmed Rayadh ◽  
Saïd Sebti
Keyword(s):  
Microwave Irradiation ◽  
Carbonyl Compounds ◽  
Environmentally Friendly ◽  
Solvent Free ◽  
Aliphatic Amines ◽  
Solvent Free Conditions ◽  
Dialkyl Phosphites ◽  
High Yields ◽  
Amino Phosphonates ◽  
Aromatic And Aliphatic Amines

A simple, efficient and environmentally friendly procedure has been developed for the three component coupling of carbonyl compounds, aromatic and aliphatic amines and dialkyl phosphites to produce α-amino phosphonates. The α-amino phosphonates are synthesised in high yields (74–97%) in a few minutes (1–3 min) by microwave irradiation under solvent-free conditions, avoiding the use of any catalyst.

A One-Pot, Three-Component, Solvent-Free Synthesis of Novel 6H-Chromeno[3’,4’:5,6]Pyrido[2,3-d]Pyrimidine-Triones under Microwave Irradiation

2018 ◽  
Vol 42 (12) ◽  
pp. 604-607
Author(s):  
Loghman Firoozpour ◽  
Hoda Yahyavi ◽  
Ramona Ejtemaei ◽  
Setareh Moghimi ◽  
Alireza Foroumadi
Keyword(s):  
Microwave Irradiation ◽  
Efficient Method ◽  
Barbituric Acid ◽  
Reaction Times ◽  
Solvent Free ◽  
One Pot ◽  
Solvent Free Conditions ◽  
Substituted Benzaldehydes ◽  
High Yields ◽  
Solvent Free Synthesis

A green and efficient method for preparing novel heterocyclic systems is established through the reaction of differently substituted benzaldehydes, barbituric acid and 4-amino-2H-chromene-2-one under solvent-free conditions. This method affords 6H-chromeno[3’,4’:5,6] pyrido[2,3-d]pyrimidine-trione derivatives in high yields and short reaction times.

1,3-Dibromo-5,5-dimethylhydantoin as a useful reagent for efficient synthesis of 3,4-dihydropyrimidin-2-(1H)-ones under solvent-free conditions

2009 ◽  
Vol 63 (1) ◽  
Author(s):  
Mohammad Abdollahi-Alibeik ◽  
Zahra Zaghaghi
Keyword(s):  
Microwave Irradiation ◽  
Ethyl Acetoacetate ◽  
Biginelli Reaction ◽  
Reaction Times ◽  
Solvent Free ◽  
Efficient Synthesis ◽  
One Pot ◽  
Aliphatic Aldehydes ◽  
Solvent Free Conditions ◽  
High Yields

AbstractEfficient syntheses of 3,4-dihydropyrimidin-2-(1H)-ones and the corresponding thioxo derivatives using 1,3-dibromo-5,5-dimethylhydantoin (DBH) catalysis of a one-pot three-component Biginelli reaction of aldehydes, ethyl acetoacetate, and urea or thiourea under microwave irradiation are described. The advantages of this method are its short reaction times, high yields of the products, inexpensive and commercially available catalyst, and solvent-free conditions. Typical isolated yields exceed 70 % for arylaldehydes (9 examples) and aliphatic aldehydes (2 examples).

Hydrolysis of amides to carboxylic acids using phthalic anhydride under microwave irradiation and solvent-free conditions

2005 ◽  
Vol 2005 (2) ◽  
pp. 119-120 ◽  
Author(s):  
Majid M. Heravi ◽  
Dordaneh Zargarani ◽  
Rahim Hekmat Shoar ◽  
Shahnaz Khaleghi
Keyword(s):  
Microwave Irradiation ◽  
Carboxylic Acids ◽  
Phthalic Anhydride ◽  
Solvent Free ◽  
Solvent Free Conditions ◽  
High Yields ◽  
Hydrolysis Of

Amides efficiently and rapidly give carboxylic acids in high yields upon reaction with phthalic anhydride under microwave irradiation in the absence of solvent.

scholarly journals Montmorillonite K-10 supported one-pot synthesis of some symmetric diimides and 3a,4,7,7a-tetrahydroisoindole-1,3-dione derivatives under solvent-free conditions using microwaves

2005 ◽  
Vol 70 (4) ◽  
pp. 579-583 ◽  
Author(s):  
Davood Habibi ◽  
Omid Marvi
Keyword(s):  
Nmr Spectroscopy ◽  
Maleic Anhydride ◽  
Microwave Irradiation ◽  
Elemental Analysis ◽  
1H Nmr Spectroscopy ◽  
Solvent Free ◽  
One Pot ◽  
Solvent Free Conditions ◽  
High Yields ◽  
Aromatic And Aliphatic Amines

The syntheses of cis-3a,4,7,7a-tetrahydroisoindole-1,3-dione derivatives and some cyclic diimides were performed by the reaction of different aromatic and aliphatic amines and diamines with cis-1,2,3,6-tetrahydrophthalic anhydride and maleic anhydride on montmorillonite K-10 under microwave irradiation and solvent- free conditions. The desired attractive products were obtained in high yields and characterized by elemental analysis aswell as by IR and 1H-NMR spectroscopy.

An efficient, Green Synthesis of benzo[a]furo[2, 3-c]phenazine derivatives via Microwave-Assisted and TiO2-SO3H as Cost-effective and Recyclable Catalyst under solvent-free conditions

2020 ◽  
Vol 17 ◽  
Author(s):  
Milad Taheri ◽  
Razieh Mohebat ◽  
Mohammad Hossein Moslemin
Keyword(s):  
Microwave Irradiation ◽  
Solid Acid Catalyst ◽  
Internal Standard ◽  
Acid Catalyst ◽  
Cost Effective ◽  
Solvent Free ◽  
One Pot ◽  
Solvent Free Conditions ◽  
High Yields ◽  
Recyclable Heterogeneous Catalyst

Background: A rapid, efficient, and environmentally benign procedure for the synthesis of novel furo [2,3- c]phenazine derivatives has been developed via reactions of 2-hydroxynaphthalene-1,4-dione, arylglyoxals, and indole in the presence of TiO2-SO3H-catalyst (TSAC) as a recyclable heterogeneous catalyst under solvent-free conditions using microwave irradiation. Introduction: This study describes a successful approach for the synthesis of 2-(4-bromophenyl)-1-(1H-indol-3-yl) benzo[a]furo[2,3-c] phenazine via TiO2-SO3H-catalyst using microwave irradiation. Objectives: In this paper, we wish to report an efficient and convenient method for the synthesis of phenazine derivatives from benzo[a]phenazin-5-ol, arylglyoxal derivatives, and Indoles in the presence of TiO2-SO3H-catalyst under microwave irradiation. Materials and Methods: All reagents and solvent were purchased from Merck and Aldrich and used without further purification. 1H NMR spectra (DMSO) were recorded on Gemini-500 MHz spectrophotometer with TMS as internal standard. Results and Discussions: To investigate the reaction conditions for the synthesis of 2-(4-bromophenyl)-1-(1H-indol-3-yl) benzo[a]furo [2, 3-c] phenazine derivatives, we performed a reaction between 2-hydroxynaphthalene-1,4-dione (1 mmol) and aromatic 1,2-diamines (1 mmol) as a model. Conclusion: We demonstrated a green and straightforward procedure for the efficient synthesis of novel benzo[a]furo[2, 3- c] phenazine derivatives in high yields via a one-pot, four-component domino protocol by using TiO2-SO3H as a mild, effective, non-toxic, and inexpensive solid acid catalyst without the addition of an organic co-solvent.

Direct benzylation of 1,3-dicarbonyl compounds catalyzed by Cs2.5H0.5PW12O40 in solvent-free conditions

2011 ◽  
Vol 89 (12) ◽  
pp. 1533-1538 ◽  
Author(s):  
Ezzat Rafiee ◽  
Maryam Khodayari ◽  
Mohammad Joshaghani
Keyword(s):  
Carbonyl Compounds ◽  
Reaction Times ◽  
Solvent Free ◽  
Dicarbonyl Compounds ◽  
Environmentally Conscious ◽  
Benzylic Alcohols ◽  
Solvent Free Conditions ◽  
Excellent Activity ◽  
High Yields ◽  
Reaction Profile

Various 1,3-dicarbonyl compounds reacted readily with benzylic alcohols in the presence of Cs2.5H0.5PW12O40 salt to produce 2-benzylic-1,3-dicarbonyl compounds in high yields. It was found that this catalyst could be completely recovered and reused without loss of its catalytic activities and is thus environmentally conscious especially in solvent-free conditions. The use of this method provides improved modification of the direct benzylation of 1,3-carbonyl compounds in terms of low reaction times, solvent-free conditions, usage of a small amount of the catalyst, and a clean reaction profile. Furthermore, the use of this catalyst is feasible because of its easy preparation, its easy handling, its stability, its easy recovery, its reusability, being environmentally green, its excellent activity, and its selectivity.

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