Visible-Light Photoredox-Catalyzed Dicarbofunctionalization of Styrenes with Oxime Esters and CO2: Multicomponent Reactions toward Cyanocarboxylic Acids and γ-Keto Acids

2021 ◽  
Author(s):  
Junxue Bai ◽  
Miao Li ◽  
Cong Zhou ◽  
Yu Sha ◽  
Jiang Cheng ◽  
...  
Keyword(s):  
Visible Light ◽  
Multicomponent Reactions ◽  
Keto Acids

scholarly journals Radical Carbonylative Synthesis of Heterocycles by Visible Light Photoredox Catalysis

Catalysts ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1054
Author(s):  
Xiao-Qiang Hu ◽  
Zi-Kui Liu ◽  
Wen-Jing Xiao
Keyword(s):  
Visible Light ◽  
Efficient Synthesis ◽  
Acyl Radical ◽  
Acyl Chlorides ◽  
Aryl Radicals ◽  
Keto Acids ◽  
Acyl Radicals ◽  
Different Types ◽  
The Impact ◽  
Visible Light Photocatalytic

Visible light photocatalytic radical carbonylation has been established as a robust tool for the efficient synthesis of carbonyl-containing compounds. Acyl radicals serve as the key intermediates in these useful transformations and can be generated from the addition of alkyl or aryl radicals to carbon monoxide (CO) or various acyl radical precursors such as aldehydes, carboxylic acids, anhydrides, acyl chlorides or α-keto acids. In this review, we aim to summarize the impact of visible light-induced acyl radical carbonylation reactions on the synthesis of oxygen and nitrogen heterocycles. The discussion is mainly categorized based on different types of acyl radical precursors.

ChemInform Abstract: Visible-Light-Mediated Decarboxylation/Oxidative Amidation of α-Keto Acids with Amines under Mild Reaction Conditions Using O2.

ChemInform ◽  
2014 ◽  
Vol 45 (30) ◽  
pp. no-no
Author(s):  
Jie Liu ◽  
Qiang Liu ◽  
Hong Yi ◽  
Chu Qin ◽  
Ruopeng Bai ◽  
...  
Keyword(s):  
Visible Light ◽  
Reaction Conditions ◽  
Keto Acids ◽  
Oxidative Amidation

scholarly journals Into the Blue: Ketene Multicomponent Reactions under Visible Light

2021 ◽  
Vol 86 (8) ◽  
pp. 5845-5851
Author(s):  
Pietro Capurro ◽  
Chiara Lambruschini ◽  
Paola Lova ◽  
Lisa Moni ◽  
Andrea Basso
Keyword(s):  
Visible Light ◽  
Multicomponent Reactions

Acyl Radicals from α-Keto Acids: Metal-Free Visible-Light-Promoted Acylation of Heterocycles

2021 ◽  
Author(s):  
Hu-Lin Zhu ◽  
Fan-Lin Zeng ◽  
Xiao-Lan Chen ◽  
Kai Sun ◽  
Hao-Cong Li ◽  
...  
Keyword(s):  
Visible Light ◽  
Metal Free ◽  
Keto Acids ◽  
Acyl Radicals

Pd and photoredox dual catalysis assisted decarboxylative ortho-benzoylation of N-phenyl-7-azaindoles

2022 ◽  
Author(s):  
Shruti Rajput ◽  
Ramandeep Kaur ◽  
Nidhi Jain
Keyword(s):  
Visible Light ◽  
Palladium Catalysis ◽  
Keto Acids ◽  
Directing Group ◽  
Dual Catalysis ◽  
Aryl Ketone

Directing group assisted decarboxylative ortho-benzoylation of N-aryl-7-azaindoles with α-keto acids has been achieved by synergistic visible light promoted photoredox and palladium catalysis. The approach tenders rapid entry to aryl ketone...

The Catalytic Activity of TiO2 Toward a Multicomponent Reaction Depends on its Morphology, Mechanoactivation and Presence of Visible Light

2020 ◽  
Vol 1 (1) ◽  
pp. 37-42
Author(s):  
Subramanian Thirumeni ◽  
Choumini Balasanthiran ◽  
Grigoriy Sereda
Keyword(s):  
Catalytic Activity ◽  
Visible Light ◽  
Tio2 Nanoparticles ◽  
Multicomponent Reaction ◽  
Multicomponent Reactions ◽  
Room Temperature ◽  
Light Condition ◽  
Ambient Light ◽  
Multicomponent Synthesis ◽  
Ambient Light Condition

Aims: Test the hypothesis that the catalytic activity of TiO2 nanoparticles towards a liquidphase or mechanoactivated multicomponent reaction can be tuned by visible light and the shape of nanoparticles. Background: Catalytic multicomponent reactions have been proven to be excellent synthetic approaches to a series of biologically relevant compounds including 2-amino-4H-benzo[b]pyrans. However, the potential photocatalytic activity and structural diversity of nanostructured catalysts remained underutilized in the design of new catalytic systems. Objective: Harness the photocatalytic potential and diverse morphology of TiO2 particles as catalysts for the liquid phase and mechanoactivated multicomponent organic reactions. Results: Catalytic activity of TiO2 nanoparticles towards multicomponent synthesis of 2-amino-4Hbenzo[ b]pyrans is increased by visible light. The nanorod-shaped TiO2 nanoparticles have shown substantially higher catalytic activity towards mechanoactivated multicomponent synthesis of 2- amino-4H-benzo[b]pyrans than their spherically-shaped counterparts. Conclusion: : An efficient methodology for the synthesis of 2-amino-4H-benzo[b]pyrans under ambient light condition has been developed using TiO2 nanorods (high aspect ratio anatase nanocrystals) as photocatalyst. This simple method furnished the corresponding terahydrobenzopyrans in high yields via three component reaction of aldehyde, malononitrile, and dimidone under solvent free reaction conditions at room temperature. The reaction takes 8-10 min at room temperature under ambient light condition and the catalyst can be reused multiple times. Utilization of light and the nanorod morphology of the catalyst through mechanoactivation has been applied for the -first time to the synthetic technique of multicomponent reactions. The synthetic procedures for 2-amino-4Hbenzo[ b]pyrans have been improved.

ChemInform Abstract: Visible Light Photoredox-Catalyzed Multicomponent Reactions.

ChemInform ◽  
2013 ◽  
Vol 44 (34) ◽  
pp. no-no
Author(s):  
Magnus Rueping ◽  
Carlos Vila
Keyword(s):  
Visible Light ◽  
Multicomponent Reactions
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