2020
DOI: 10.1039/d0ra04008h
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Abstract:

A nano-sized Fe3O4-supported Lewis acid ionic liquid catalyst for the synthesis of polyhydroquinolines and propargylamines under ultrasound irradiation has been developed.

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Cited by 37 publications
(14 citation statements)
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“…Among the synthetic methods of this nucleus, the use of heterogeneous catalysts under ultrasonic irradiation is highlighted. Examples in this category are two one-pot protocols developed by Aute et al [125] and Nguyen and co-workers [126] using aldehydes ( 1 ), β -ketoesters ( 2 ), dimedone ( 4 ) or other cyclic diketones ( 6 ), and ammonium acetate as starting materials. In the first work, the researchers have synthesized a set of PHQs using an efficient catalytic system composed of aluminized polyborate (10 w/w %) as a way to increase the stability and improve the catalytic properties of the borate ( Table 3 , Entry 1).…”
Section: Ultrasound-assisted Mcrs Under Heterogeneous Catalysismentioning
confidence: 99%
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“…Among the synthetic methods of this nucleus, the use of heterogeneous catalysts under ultrasonic irradiation is highlighted. Examples in this category are two one-pot protocols developed by Aute et al [125] and Nguyen and co-workers [126] using aldehydes ( 1 ), β -ketoesters ( 2 ), dimedone ( 4 ) or other cyclic diketones ( 6 ), and ammonium acetate as starting materials. In the first work, the researchers have synthesized a set of PHQs using an efficient catalytic system composed of aluminized polyborate (10 w/w %) as a way to increase the stability and improve the catalytic properties of the borate ( Table 3 , Entry 1).…”
Section: Ultrasound-assisted Mcrs Under Heterogeneous Catalysismentioning
confidence: 99%
“… Entry Catalyst Conditions a Examples Yields (%) Ref. 1 Alum.poliborate EtOH:H 2 O, 45–50 min 13 86–96 [126] 2 LAIL@MNP Solvent-free, 15–60 min, 80 °C 18 75–97 [125] 3 MWCNTs@meglumine 15–34 min, r.t. 7 85–94 [115] 4 Fe 3 O 4 /SiO 2 -PDA H 2 O,10 min, r.t 5 85–89 [111] 5 Fe 3 O 4 @GA@IG 45–70 min 10 71–93 [118] 6 Fe 3 O 4 @GA@IG 50–60 min 3 61–89 [118] *Ultrasound parameters: Entry 1. Ultrasound device with frequency of 33 kHz and power: 100 W, no further details were informed.…”
Section: Ultrasound-assisted Mcrs Under Heterogeneous Catalysismentioning
confidence: 99%
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“…The synthetic efficiency and operational simplicity of multicomponent reactions make them cost effective, time efficient and eco-friendly in comparison to conventional multistep synthesis. [3][4][5][6][7][8] .…”
Section: Introductionmentioning
confidence: 99%