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Keywords = Q-Tube reactor

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9 pages, 2557 KiB  
Communication
The Q-Tube-Assisted Green Sustainable Synthesis of Fused Azines: New Synthetic Opportunities via Innovative Green Technology
by Abeer Nasser Al-Romaizan, Salem M. Bawaked, Tamer S. Saleh and Mohamed Mokhtar M. Moustafa
Appl. Sci. 2023, 13(21), 11864; https://doi.org/10.3390/app132111864 - 30 Oct 2023
Cited by 1 | Viewed by 2102
Abstract
An efficient, economical, and green, sustainable synthesis of fused azines using Mg-Al hydrotalcite under a high-pressure Q-Tube reactor has been developed. This reaction proceeds through the aza-Michael addition of α,β-unsaturated ketone with different aminoazoles. This method offered excellent yields in a short reaction [...] Read more.
An efficient, economical, and green, sustainable synthesis of fused azines using Mg-Al hydrotalcite under a high-pressure Q-Tube reactor has been developed. This reaction proceeds through the aza-Michael addition of α,β-unsaturated ketone with different aminoazoles. This method offered excellent yields in a short reaction time that economically saved energy in addition to the protocol showing the reuse of the catalyst seven times without losing its catalytic activity. Full article
(This article belongs to the Topic Advances in Sustainable Materials and Products)
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13 pages, 2498 KiB  
Communication
Bis(pyridine)enaminone as a Precursor for the Synthesis of Bis(azoles) and Bis(azine) Utilizing Recent Economic Green Chemistry Technology: The Q-Tube System
by Khadijah M. Al-Zaydi, Tamer S. Saleh, Norah F. Alqahtani and Meaad S. Bagazi
Molecules 2023, 28(5), 2355; https://doi.org/10.3390/molecules28052355 - 3 Mar 2023
Cited by 3 | Viewed by 2540
Abstract
We reported herein efficient economic high-pressure synthesis procedures for the synthesis of bis(azoles) and bis(azines) by utilizing the bis(enaminone) intermediate. Bis(enaminone) reacted with hydrazine hydrate, hydroxylamine hydrochloride, guanidine hydrochloride, urea, thiourea, and malononitrile to form the desired bis azines and bis azoles. A [...] Read more.
We reported herein efficient economic high-pressure synthesis procedures for the synthesis of bis(azoles) and bis(azines) by utilizing the bis(enaminone) intermediate. Bis(enaminone) reacted with hydrazine hydrate, hydroxylamine hydrochloride, guanidine hydrochloride, urea, thiourea, and malononitrile to form the desired bis azines and bis azoles. A combination of elemental analyses and spectral data was used to confirm the structures of the products. Compared with conventional heating, the high-pressure Q-Tube method promotes reactions in a short period of time and provides high yields. Full article
(This article belongs to the Special Issue Recent Progress in Green Organic Synthesis)
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14 pages, 1488 KiB  
Article
High-Pressure Metal-Free Catalyzed One-Pot Two-Component Synthetic Approach for New 5-Arylazopyrazolo[3,4-b]Pyridine Derivatives
by AbdElAziz A. Nayl, Hamada Mohamed Ibrahim, Kamal M. Dawood, Wael A. A. Arafa, Ahmed I. Abd-Elhamid, Ismail M. Ahmed, Mohamed A. Abdelgawad, Hazim M. Ali, Ibrahim Hotan Alsohaimi, Ashraf A. Aly, Stefan Bräse and Asmaa Kamal Mourad
Molecules 2022, 27(19), 6369; https://doi.org/10.3390/molecules27196369 - 27 Sep 2022
Cited by 3 | Viewed by 1890
Abstract
An appropriate and efficient Q-tube-assisted ammonium acetate-mediated protocol for the assembly of the hitherto unreported 5-arylazopyrazolo[3,4-b]pyridines was demonstrated. This methodology comprises the cyclocondensation reaction of 5-amino-2-phenyl-4H-pyrazol-3-one with an assortment of arylhydrazonals in an NH4OAc/AcOH buffer solution operating [...] Read more.
An appropriate and efficient Q-tube-assisted ammonium acetate-mediated protocol for the assembly of the hitherto unreported 5-arylazopyrazolo[3,4-b]pyridines was demonstrated. This methodology comprises the cyclocondensation reaction of 5-amino-2-phenyl-4H-pyrazol-3-one with an assortment of arylhydrazonals in an NH4OAc/AcOH buffer solution operating a Q-tube reactor. This versatile protocol exhibited several outstanding merits: easy work-up, mild conditions, scalability, broad substrate scope, safety (the Q-tube kit is simply for pressing and sealing), and a high atom economy. Consequently, performing such reactions under elevated pressures and utilizing the Q-tube reactor seemed preferable for achieving the required products in comparison to the conventional conditions. Diverse spectroscopic methods and X-ray single-crystal techniques were applied to confirm the proposed structure of the targeted compounds. Full article
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12 pages, 241 KiB  
Article
Non-Conventional Methodologies in the Synthesis of 1-Indanones
by Manuela Oliverio, Monica Nardi, Paola Costanzo, Luca Cariati, Giancarlo Cravotto, Salvatore Vincenzo Giofrè and Antonio Procopio
Molecules 2014, 19(5), 5599-5610; https://doi.org/10.3390/molecules19055599 - 30 Apr 2014
Cited by 29 | Viewed by 13407
Abstract
1-Indanones have been successfully prepared by means of three different non-conventional techniques, namely microwaves, high-intensity ultrasound and a Q-tube™ reactor. A library of differently substituted 1-indanones has been prepared via one-pot intramolecular Friedel-Crafts acylation and their efficiency and “greenness” have been compared. [...] Read more.
1-Indanones have been successfully prepared by means of three different non-conventional techniques, namely microwaves, high-intensity ultrasound and a Q-tube™ reactor. A library of differently substituted 1-indanones has been prepared via one-pot intramolecular Friedel-Crafts acylation and their efficiency and “greenness” have been compared. Full article
(This article belongs to the Section Organic Chemistry)
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