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Ultrasound-promoted convenient and ionic liquid [BMIM]BF4 assisted green synthesis of diversely functionalized pyrazolo quinoline core via one-pot multicomponent reaction, DFT study and pharmacological evaluation

An ultrasound-assisted green protocol for one-pot synthesis of a new series of pharmaceutically relevant pyrazolo quinoline derivatives ( 4a–t ) were synthesized, characterized, and evaluated using DFT and biological activities. Pyrazolo quinoline derivatives ( 4a–t ) were synthesized via a three-co...

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Published in:Molecular diversity 2023-06, Vol.27 (3), p.1409-1425
Main Authors: Chudasama, Dipakkumar D., Patel, Manan S., Parekh, Jaydeepkumar N., Patel, Harsh C., Rajput, Chetan V., Chikhaliya, Navin P., Ram, Kesur R.
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creator Chudasama, Dipakkumar D.
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description An ultrasound-assisted green protocol for one-pot synthesis of a new series of pharmaceutically relevant pyrazolo quinoline derivatives ( 4a–t ) were synthesized, characterized, and evaluated using DFT and biological activities. Pyrazolo quinoline derivatives ( 4a–t ) were synthesized via a three-component tandem reaction of 1,3-dicarbonyl compound ( 1a–b), substituted aromatic aldehyde ( 2a–o), and 5-amino indazole ( 3a ) in the presence of 1-butyl-3-methylimidazolium tetrafluoroborate [BMIM]BF 4 ionic liquid in ethanol at ambient conditions. The main purpose of the present work is selective functionalization of pyrazolo quinoline ( 4a–t ) core excluding another potential parallel reaction under environmentally benign reaction conditions. The present protocol shows features such as amphiphilic behavior of ionic liquid during reaction transformation, and reusability of the [BMIM]BF 4 ionic liquid under mild reaction condition. All newly derived compounds were evaluated for their in vitro anti-inflammatory and antioxidant activity. Among them, compound 4c showed encouraging antioxidant activity compared with standard antioxidant ascorbic acid, and compounds 4n and 4r displayed very good anti-inflammatory activity compared with a standard drug. In this study, a theoretical computational density functional study was also executed to perform the geometry optimizations, frontier molecular orbital approach, and molecular electrostatic potential (MESP). The DFT study was carried out with the basis set DFT/B3LYP/6-31+G (d, p) level of theory. The quantum chemical descriptors (QCDS) and MESP diagrams were plotted to examine the biological reactivities of representative pyrazolo quinolines ( 4a–t ). Graphical abstract
doi_str_mv 10.1007/s11030-022-10498-2
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subjects Antioxidants
Biochemistry
Biomedical and Life Sciences
Ions
Life Sciences
Organic Chemistry
Original Article
Pharmacy
Polymer Sciences
Ultrasonic imaging
title Ultrasound-promoted convenient and ionic liquid [BMIM]BF4 assisted green synthesis of diversely functionalized pyrazolo quinoline core via one-pot multicomponent reaction, DFT study and pharmacological evaluation
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