Visible-light-induced photoxidation-Povarov cascade reaction: synthesis of 2-arylquinoline through alcohol and N-benzylanilines under mild conditions via Ag/g-C3N4 nanometric semiconductor catalyst

2020 ◽  
Vol 56 (35) ◽  
pp. 4840-4843 ◽  
Author(s):  
Peng Wang ◽  
Xiaowen Wang ◽  
Xiyu Niu ◽  
Li Zhu ◽  
Xiaoquan Yao
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Cascade Reaction ◽  
Light Irradiation ◽  
Reaction Synthesis ◽  
Mild Conditions

Ag/g-C3N4 nanometric semiconductor catalyzed cascade reaction for the synthesis of 2-arylquinoline through alcohol and N-benzylanilines under visible light irradiation.

scholarly journals TiO2 Photocatalyzed C–H Bond Transformation for C–C Coupling Reactions

Catalysts ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 355 ◽  
Author(s):  
Yi Wang ◽  
Anan Liu ◽  
Dongge Ma ◽  
Shuhong Li ◽  
Chichong Lu ◽  
...  
Keyword(s):  
Transition Metal ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Transition Metal Catalysis ◽  
Light Irradiation ◽  
Coupling Reactions ◽  
Metal Catalysis ◽  
Bond Functionalization ◽  
Tio2 Photocatalysis ◽  
Mild Conditions

Fulfilling the direct inert C–H bond functionalization of raw materials that are earth-abundant and commercially available for the synthesis of diverse targeted organic compounds is very desirable and its implementation would mean a great reduction of the synthetic steps required for substrate prefunctionalization such as halogenation, borylation, and metalation. Successful C–H bond functionalization mainly resorts to homogeneous transition-metal catalysis, albeit sometimes suffering from poor catalyst reusability, nontrivial separation, and severe biotoxicity. TiO2 photocatalysis displays multifaceted advantages, such as strong oxidizing ability, high chemical stability and photostability, excellent reusability, and low biotoxicity. The chemical reactions started and delivered by TiO2 photocatalysts are well known to be widely used in photocatalytic water-splitting, organic pollutant degradation, and dye-sensitized solar cells. Recently, TiO2 photocatalysis has been demonstrated to possess the unanticipated ability to trigger the transformation of inert C–H bonds for C–C, C–N, C–O, and C–X bond formation under ultraviolet light, sunlight, and even visible-light irradiation at room temperature. A few important organic products, traditionally synthesized in harsh reaction conditions and with specially functionalized group substrates, are continuously reported to be realized by TiO2 photocatalysis with simple starting materials under very mild conditions. This prominent advantage—the capability of utilizing cheap and readily available compounds for highly selective synthesis without prefunctionalized reactants such as organic halides, boronates, silanes, etc.—is attributed to the overwhelmingly powerful photo-induced hole reactivity of TiO2 photocatalysis, which does not require an elevated reaction temperature as in conventional transition-metal catalysis. Such a reaction mechanism, under typically mild conditions, is apparently different from traditional transition-metal catalysis and beyond our insights into the driving forces that transform the C–H bond for C–C bond coupling reactions. This review gives a summary of the recent progress of TiO2 photocatalytic C–H bond activation for C–C coupling reactions and discusses some model examples, especially under visible-light irradiation.

An effective photothermal dual-responsive Pd1Cu4/CexOy catalyst for Suzuki–Miyaura coupling reactions under mild conditions

2020 ◽  
Vol 44 (9) ◽  
pp. 3794-3801
Author(s):  
Bo Liu ◽  
Tong Xu ◽  
Chunping Li ◽  
Jie Bai
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Coupling Reactions ◽  
Suzuki Reactions ◽  
Mild Conditions ◽  
Dual Responsive

A Pd1Cu4/CexOy catalyst can efficiently catalyze Suzuki reactions under both heating and visible light irradiation conditions.

An uncommon use of irradiated flavins: Brønsted acid catalysis

2020 ◽  
Vol 56 (42) ◽  
pp. 5661-5664
Author(s):  
Yukihiro Arakawa ◽  
Tomohiro Mihara ◽  
Hiroki Fujii ◽  
Keiji Minagawa ◽  
Yasushi Imada
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Acid Catalysis ◽  
Light Irradiation ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Mild Conditions ◽  
Brönsted Acid ◽  
Bronsted Acid Catalysis

Visible light irradiation to flavins in the presence of thiols and O2 provides Brønsted acidic species that can be used as efficient catalysts for thioacetalizations and for Mannich-type reactions under non-irradiation and mild conditions.

Nucleophilic (Radio)Fluorination of Redox-Active Esters via Radical-Polar Crossover Enabled by Photoredox Catalysis

2020 ◽  
Author(s):  
Eric Webb ◽  
John Park ◽  
Erin L. Cole ◽  
David J. Donnelly ◽  
Samuel Bonacorsi, Jr. ◽  
...  
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Active Esters ◽  
Mild Conditions ◽  
Redox Active ◽  
Active Ester ◽  
Electron Transfers ◽  
Ester Substrate ◽  
Nucleophilic Fluorination

<p>We report a redox-neutral method for nucleophilic fluorination of N-hydroxyphthalimide esters using an Ir photocatalyst under visible light irradiation. The method provides access to a broad range of aliphatic fluorides, including primary, secondary, and tertiary benzylic fluorides as well as unactivated tertiary fluorides, that are typically inaccessible by nucleophilic fluorination due to competing elimination. In addition, we show that the decarboxylative fluorination conditions are readily adapted to radiofluorination with [<sup>18</sup>F]KF. We propose that the reactions proceed by two electron transfers between the Ir catalyst and redox-active ester substrate to afford a carbocation intermediate that undergoes subsequent trapping by fluoride. Examples of trapping with O- and C-centered nucleophiles and deoxyfluorination via N-hydroxyphthalimidoyl oxalates are also presented, suggesting that this approach may offer a general blueprint for affecting redox-neutral SN1 substitutions under mild conditions.</p>

Visible-light organic photoredox catalytic cascade reaction

2021 ◽  
Author(s):  
Guo-Qiang Xu ◽  
Peng-Fei Xu
Keyword(s):  
Transition Metals ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Cascade Reactions ◽  
Cascade Reaction ◽  
Light Irradiation ◽  
The Past

Over the past years, impressive progress has been made on the development of organic photoredox catalytic cascade reactions without the participation of expensive and toxic transition-metals under visible light irradiation....

scholarly journals Photocatalytic hydrogen evolution by co-catalyst-free TiO2/C bulk heterostructures synthesized under mild conditions

RSC Advances ◽  
2020 ◽  
Vol 10 (21) ◽  
pp. 12519-12534 ◽  
Author(s):  
Claudio Imparato ◽  
Giuseppina Iervolino ◽  
Marzia Fantauzzi ◽  
Can Koral ◽  
Wojciech Macyk ◽  
...  
Keyword(s):  
Visible Light ◽  
Hydrogen Evolution ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Co Catalyst ◽  
Photocatalytic Hydrogen Evolution ◽  
Mild Conditions ◽  
Catalyst Free

Defective TiO2/C bulk heterostructures exhibit visible light photoresponsivity and remarkable H2 evolution rates under both UV and visible light irradiation.

Synthesis of trifluoroalkyl or difluoroalkyl phenanthridine derivatives via cascade reaction using an intramolecular cyano group as a radical acceptor under photoredox catalysis

2018 ◽  
Vol 16 (3) ◽  
pp. 414-423 ◽  
Author(s):  
Xu Liu ◽  
Zhongjie Wu ◽  
Zeguo Zhang ◽  
Ping Liu ◽  
Peipei Sun
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Cyano Group ◽  
Cascade Reaction ◽  
Light Irradiation ◽  
Photoredox Catalysis ◽  
Cascade Cyclization ◽  
Radical Acceptor ◽  
Cyclization Process

In the presence of Ru(phen)3Cl2 or fac-Ir(ppy)3 under visible-light irradiation, the addition of fluorinated radicals to N-arylacrylamides followed by an intramolecular cyano group insertion cascade cyclization process produced the target compounds in moderate to good yields.

Photocatalytic transition-metal-free direct 3-alkylation of 2-aryl-2H-indazoles in dimethyl carbonate

2021 ◽  
Author(s):  
Chunhua Ma ◽  
Zhiwen Feng ◽  
Jing Li ◽  
Dandan Zhang ◽  
Wei Li ◽  
...  
Keyword(s):  
Transition Metal ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Dimethyl Carbonate ◽  
Light Irradiation ◽  
Alkylation Reaction ◽  
Metal Free ◽  
Mild Conditions

A general transition-metal-free photocatalytic decarboxylative 3-alkylation reaction of 2-aryl-2H-indazoles was developed under visible-light irradiation under mild conditions.

Photocatalytic Sonogashira reaction over silicon carbide supported Pd–Cu alloy nanoparticles under visible light irradiation

2018 ◽  
Vol 8 (13) ◽  
pp. 3357-3362 ◽  
Author(s):  
Bing Wang ◽  
Yingyong Wang ◽  
Jiazhou Li ◽  
Xiaoning Guo ◽  
Gailing Bai ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Sonogashira Reaction ◽  
Alloy Nanoparticles ◽  
Mild Conditions ◽  
Cu Alloy ◽  
Ligand Free ◽  
Supported Pd

PdCu alloy nanoparticles supported on SiC can efficiently catalyze the Sonogashira reaction by visible light irradiation under ligand-free and mild conditions. The superior catalytic activity of PdCu catalysts was caused by the synergistic effect of PdCu alloy nanoparticles.

Photoinduced synthesis of (E)-vinyl sulfones through the insertion of sulfur dioxide

2018 ◽  
Vol 5 (21) ◽  
pp. 3153-3157 ◽  
Author(s):  
Tong Liu ◽  
Yechun Ding ◽  
Xiaona Fan ◽  
Jie Wu
Keyword(s):  
Sulfur Dioxide ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Mild Conditions ◽  
Three Component Reaction ◽  
Photoinduced Synthesis

Under visible light irradiation, a three-component reaction of potassium alkyltrifluoroborates, sulfur dioxide and alkynes with the assistance of photocatalysis and in the presence of copper(ii) triflate is described. This transformation affords (E)-vinyl sulfones efficiently with excellent regioselectivity and stereoselectivity under mild conditions.

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