Protic guanidinium ionic liquid as a green and highly efficient catalyst for the synthesis of functionalized spirochromenes under solvent-free conditions

2014 ◽  
Vol 17 (12) ◽  
pp. 1160-1164 ◽  
Author(s):  
Seyed Meysam Baghbanian ◽  
Mahmood Tajbakhsh ◽  
Maryam Farhang
2018 ◽  
Vol 21 (8) ◽  
pp. 602-608 ◽  
Author(s):  
Zainab Ehsani-Nasab ◽  
Ali Ezabadi

Aim and Objective: In the present work, 1, 1’-sulfinyldiethylammonium bis (hydrogen sulfate) as a novel room temperature dicationic ionic liquid was synthesized and used as a catalyst for xanthenediones synthesis. Material and Method: The dicationic ionic liquid has been synthesized using ethylamine and thionyl chloride as precursors. Then, by the reaction of [(EtNH2)2SO]Cl2 with H2SO4, [(EtNH2)2SO][HSO4]2 was prepared and after that, it was characterized by FT-IR, 1H NMR, 13C NMR as well as Hammett acidity function. This dicationic ionic liquid was used as a catalyst for the synthesis of xanthenediones via condensation of structurally diverse aldehydes and dimedone under solvent-free conditions. The progress of the reaction was monitored by thin layer chromatography (ethyl acetate/n-hexane = 3/7). Results: An efficient solvent-free method for the synthesis of xanthenediones has been developed in the presence of [(EtNH2)2SO][HSO4]2 as a powerful catalyst with high to excellent yields, and short reaction times. Additionally, recycling studies have demonstrated that the dicationic ionic liquid can be readily recovered and reused at least four times without significant loss of its catalytic activity. Conclusion: This new dicationic ionic liquid can act as a highly efficient catalyst for xanthenediones synthesis under solvent-free conditions.


2018 ◽  
Vol 20 (11) ◽  
pp. 2571-2577 ◽  
Author(s):  
Zhaojun Xu ◽  
Xiaoli Yu ◽  
Xinxin Sang ◽  
Dawei Wang

A BINAP-Cu system supported by hydrotalcite has been developed and proved to be a highly efficient catalyst for the atom-efficient and green borrowing hydrogen reaction and dehydrogenative cyclization.


RSC Advances ◽  
2019 ◽  
Vol 9 (35) ◽  
pp. 19940-19948 ◽  
Author(s):  
L. Moradi ◽  
M. Mirzaei

Perlite nanoparticles were prepared, modified with Lewis acidic ionic liquid, and used as a highly efficient catalyst for the eco-friendly, solvent free and high yield synthesis of xanthenesviaa multicomponent reaction.


2017 ◽  
Vol 19 (16) ◽  
pp. 3801-3812 ◽  
Author(s):  
Radhika Gupta ◽  
Manavi Yadav ◽  
Rashmi Gaur ◽  
Gunjan Arora ◽  
Rakesh Kumar Sharma

A supported ionic liquid-based magnetic nanocatalyst has been fabricated for the formation of pharmaceutically important N-aryl oxazolidin-2-ones.


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