Rapid and efficient synthesis of metal-free phthalocyanine derivatives

2006 ◽  
Vol 10 (11) ◽  
pp. 1253-1258 ◽  
Author(s):  
Ahmad Shaabani ◽  
Ali Maleki
Keyword(s):  
Ionic Liquid ◽  
Microwave Irradiation ◽  
Phase Transfer ◽  
Tetrabutylammonium Bromide ◽  
Efficient Synthesis ◽  
Metal Free ◽  
High Yields ◽  
Short Times

Metal-free phthalocyanine derivatives have been synthesized in very short times with high yields in the presence of 1,1,3,3-tetramethylguanidinium trifluoroacetate (TMGT) as an ionic liquid or tetrabutylammonium bromide (TBAB) as a phase transfer reagent under both classical heating conditions and using microwave irradiation. The best results were obtained with ionic liquid. Both the ionic liquid and phase transfer reagent can be recycled for subsequent reactions and reused without appreciable loss of efficiency.

Cinchona alkaloid and di-tert-butyldicarbonate–DMAP promoted efficient synthesis of (E)-nitroolefins

RSC Advances ◽  
2016 ◽  
Vol 6 (59) ◽  
pp. 54495-54502 ◽  
Author(s):  
Nataraj Poomathi ◽  
Paramasivan T. Perumal
Keyword(s):  
Cinchona Alkaloid ◽  
Efficient Synthesis ◽  
Metal Free ◽  
High Yields

A simple and efficient metal-free methodology for the synthesis of β-nitroolefins has been developed from arylidinemalononitrile using bifunctional cinchona alkaloid along with di-tert-butyldicarbonate–DMAP in high yields with total selectivity.

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).

Task-specific ionic-liquid-catalyzed efficient synthesis of indole derivatives under solvent-free conditions

2010 ◽  
Vol 88 (2) ◽  
pp. 150-154 ◽  
Author(s):  
Sudarshan Das ◽  
Matiur Rahman ◽  
Dhiman Kundu ◽  
Adinath Majee ◽  
Alakananda Hajra
Keyword(s):  
Ionic Liquid ◽  
Room Temperature ◽  
Acid Catalyst ◽  
Significant Loss ◽  
Solvent Free ◽  
Indole Derivatives ◽  
Efficient Synthesis ◽  
Solvent Free Conditions ◽  
High Yields ◽  
Task Specific Ionic Liquid

A sulfonic-acid-functionalized ionic liquid is used as a Brønsted acid catalyst for the efficient synthesis of indole derivatives in good-to-high yields at room temperature under solvent-free conditions. The catalyst can be reused for ten consecutive runs without significant loss of activity.

Green and efficient synthesis of pyranopyrazoles using [bmim][OH−] as an ionic liquid catalyst in water under microwave irradiation and investigation of their antioxidant activity

RSC Advances ◽  
2016 ◽  
Vol 6 (89) ◽  
pp. 85877-85884 ◽  
Author(s):  
Roghayeh Sharifi Aliabadi ◽  
Nosrat O. Mahmoodi
Keyword(s):  
Antioxidant Activity ◽  
Ionic Liquid ◽  
Vitamin E ◽  
Microwave Irradiation ◽  
Efficient Synthesis ◽  
Vitamin E And C

Green and speedy synthesis of bispyranopyrazoles. [bmim][OH−] ionic liquid. Microwave irradiation. Antioxidant activity compared to vitamin E and C.

scholarly journals [DBN][HSO4]-Promoted facile and green synthesis of 2-Amino-4H-pyrans derivatives under microwave irradiation

2021 ◽  
Vol 11 (2-S) ◽  
pp. 89-97
Author(s):  
Vishal Mane ◽  
Dhanjay Mane
Keyword(s):  
Ionic Liquid ◽  
Microwave Irradiation ◽  
Room Temperature ◽  
Knoevenagel Condensation ◽  
Reaction Times ◽  
Environmentally Benign ◽  
Successive Reaction ◽  
Solvent Free Conditions ◽  
High Yields ◽  
First Time

The [DBN][HSO4] -promoted Knoevenagel condensation followed by cyclization protocol has been developed for the first time by a successive reaction of aldehydes, dimedone and malononitrile to afford 2-Amino-4H-pyrans derivatives in high to excellent yields at room temperature. The synergic couple of microwave and ionic liquid provided the capability to allow a variability of functional groups, short reaction times, easy workup, high yields, recyclability of the catalyst, and solvent-free conditions, thus providing economic and environmental advantages. Keywords: [DBN][HSO4], Environmentally benign, 2-Amino-4H-pyrans, Knoevenagel condensation, Microwave irradiation

Microwave-Assisted Efficient synthesis of Dihydro Pyrimidines: Improved High Yielding Protocol for the Biginelli Reaction

2000 ◽  
Vol 2000 (7) ◽  
pp. 354-355 ◽  
Author(s):  
J.S. Yadav ◽  
B.V. Subba Reddy ◽  
E. Jagan Reddy ◽  
T. Ramalingam
Keyword(s):  
Acetic Acid ◽  
Microwave Irradiation ◽  
Biginelli Reaction ◽  
Acid Catalysts ◽  
Efficient Synthesis ◽  
One Pot ◽  
Amberlyst 15 ◽  
Microwave Assisted ◽  
Cyclocondensation Reaction ◽  
High Yields

Dihydropyrimidines were synthesised in high yields by one-pot cyclocondensation reaction of aldehydes, aceto-acetates and urea using various acid catalysts like Amberlyst-15, Nafion-H, KSF clay and dry acetic acid under microwave irradiation.

A green procedure for the synthesis of cinnamate esters using Aliquat®336

2005 ◽  
Vol 2005 (10) ◽  
pp. 629-631 ◽  
Author(s):  
Tanusri Mahapatra ◽  
Amarendra Patra ◽  
Alok Kumar Mitra
Keyword(s):  
Ionic Liquid ◽  
Liquid Phase ◽  
Green Chemistry ◽  
Microwave Irradiation ◽  
Liquid Medium ◽  
Phase Transfer ◽  
Phase Transfer Catalyst ◽  
Solid Liquid ◽  
Green Procedure ◽  
Ionic Liquid Medium

As an effective solid-liquid phase-transfer catalyst as well as an ionic liquid medium Aliquat® 336 has been applied in the synthesis of cinnamate esters under mild green chemistry procedures involving microwave irradiation.

scholarly journals Tetrabutylammonium Bromide (TBAB) Catalyzed Synthesis of Bioactive Heterocycles

Molecules ◽  
2020 ◽  
Vol 25 (24) ◽  
pp. 5918
Author(s):  
Bimal Krishna Banik ◽  
Bubun Banerjee ◽  
Gurpreet Kaur ◽  
Shivam Saroch ◽  
Rajat Kumar
Keyword(s):  
Phase Transfer ◽  
Tetrabutylammonium Bromide ◽  
Catalytic Amount ◽  
Coupling Reactions ◽  
Efficient Synthesis ◽  
Organic Transformations ◽  
Co Catalyst ◽  
Oxidation Reduction ◽  
Recent Developments ◽  
Significant Attention

During the last two decades, tetrabutylammonium bromide (TBAB) has gained significant attention as an efficient metal-free homogeneous phase-transfer catalyst. A catalytic amount of TBAB is sufficient to catalyze various alkylation, oxidation, reduction, and esterification processes. It is also employed as an efficient co-catalyst for numerous coupling reactions. It has also acted as an efficient zwitterionic solvent in many organic transformations under molten conditions. In this review, we have summarized the recent developments on TBAB-catalyzed protocols for the efficient synthesis of various biologically promising heterocyclic scaffolds.

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