Journal ArticleDOI
A nano-organo catalyzed route towards the efficient synthesis of benzo[b]pyran derivatives under ultrasonic irradiation
Ridaphun Nongrum,Geetmani Singh Nongthombam,Mattilang Kharkongor,Noimur Rahman,Chingrishon Kathing,Bekington Myrboh,Rishanlang Nongkhlaw +6 more
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In this article, an efficient one-pot synthesis of benzo[b]pyrans catalyzed by vitamin B1 functionalized Fe2O3@SiO2 NPs under ultrasonic conditions is reported.Abstract:
An efficient, one-pot synthesis of benzo[b]pyrans catalyzed by vitamin B1 functionalized Fe2O3@SiO2 NPs under ultrasonic conditions is reported herein. The nano-organocatalyst was synthesized and characterized by FT-IR, TEM, EDS, powder XRD, etc. Several benzo[b]pyran derivatives were prepared with satisfactory yields and the nanocatalyst was magnetically retrieved and recycled. The salient features of this protocol include convenient work-up procedure, mild reaction conditions, easy catalyst recovery, shorter reaction time and use of green solvents. Ultrasound energy has been meticulously exploited for the synthesis of a nano-organocatalyst as well as for the preparation of several benzo[b]pyran derivatives. The biological activity of the synthesized benzo[b]pyrans were investigated and one of the derivatives was found to demonstrate profound activity in suppressing the side-effects of chlorpyrifos, an insecticide on the morphology of the external gills of the Duttaphrynus melanostictus tadpoles.read more
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Organocatalysis: A Brief Overview on Its Evolution and Applications
TL;DR: The use of small organic molecules as catalysts has gained increasing importance recently as discussed by the authors, and they present a lot of advantages, like being less toxic, less polluting, and more economically viable than the organometallic catalysts that dominate asymmetric synthesis.
Journal ArticleDOI
Ultrasound-Assisted Multicomponent Reactions, Organometallic and Organochalcogen Chemistry
Filipe Penteado,Bonifacio Monti,Luca Sancineto,Gelson Perin,Raquel G. Jacob,Claudio Santi,Eder J. Lenardão +6 more
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A choline chloride-based deep eutectic solvent promoted three-component synthesis of tetrahydrobenzo[b]pyran and pyrano[2,3-d] pyrimidinone (thione) derivatives
TL;DR: An efficient one-pot method for the synthesis of tetrahydrobenzo[b]pyran and pyrano[2,3-d]pyrimidinone (thione) derivatives through a three-component reaction between aldehydes, malononitrile and enolizable C-H activated acidic compounds using a new deep eutectic solvent made of choline chloride, urea and thiourea as an environmentally benign catalyst has been reported.
Journal ArticleDOI
Novel ferrocene substituted benzimidazolium based ionic liquid immobilized on magnetite as an efficient nano-catalyst for the synthesis of pyran derivatives
TL;DR: In this article, a magnetically recoverable Fe3O4@SiO2-BenzIm-Fc[Cl]/NiCl2 nanoparticle was also synthesized using a simple chemical coprecipitation approach.
Journal ArticleDOI
Introduction of an efficient DABCO-based bis-dicationic ionic salt catalyst for the synthesis of arylidenemalononitrile, pyran and polyhydroquinoline derivatives
Mehdi Zabihzadeh,Atefeh Omidi,Farhad Shirini,Hassan Tajik,Mohaddeseh Safarpoor Nikoo Langarudi +4 more
TL;DR: An affordable bis-dicationic ionic salt ([(DABCO)2C3H5OH]·2Cl) was utilized for the synthesis of arylidenemalononitrile, tetrahydrobenzo[b]pyran, pyrano[2,3-d]-pyrimidinone (thione), dihydropyrano [3,2-c]chromene, and polyhydroquinoline derivatives as mentioned in this paper.
References
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TL;DR: In this article, a semi-empirical exchange correlation functional with local spin density, gradient, and exact exchange terms was proposed. But this functional performed significantly better than previous functionals with gradient corrections only, and fits experimental atomization energies with an impressively small average absolute deviation of 2.4 kcal/mol.
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The chemistry of heterocyclic compounds
TL;DR: In this article, it was shown that one of the most common types of known quantities of phenyl phenyl is phenyl oxide (POP) oxide, which is a phenyl-oxyoxy phenyl (PE)-oxyoxyphenyl) that can be obtained from phenyl compounds.
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Power ultrasound in organic synthesis: moving cavitational chemistry from academia to innovative and large-scale applications
Giancarlo Cravotto,Pedro Cintas +1 more
TL;DR: This critical review is aimed at discussing the present status of cavitational chemistry and some of the underlying phenomena, and to highlight some recent applications and trends in organic sonochemistry, especially in combination with other sustainable technologies.
Journal ArticleDOI
Synthesis and pharmacological activity of 2-oxo-(2H) 1-benzopyran-3-carboxamide derivatives
TL;DR: In this article, the synthesis and biological activity of heterocyclic compounds synthesized by carbon suboxide was investigated and some 2-oxo (2H) 1-benzopyran-3-carboxamide derivatives were screened.