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Keywords = organophotoredox catalysis

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10 pages, 3418 KB  
Review
Recent Advances of Dicyanopyrazine (DPZ) in Photoredox Catalysis
by Vishal Srivastava, Pravin K. Singh, Arjita Srivastava, Surabhi Sinha and Praveen P. Singh
Photochem 2021, 1(2), 237-246; https://doi.org/10.3390/photochem1020014 - 2 Sep 2021
Cited by 38 | Viewed by 7349
Abstract
Visible light organophotoredox catalysis has emerged as an invaluable tool for organic synthetic transformations since it works brilliantly in tandem with organic substrates and has been known to create unique chemical environment for organic transformations. Dicyanopyrazine (DPZ), a relatively lesser researched organophotoredox catalyst, [...] Read more.
Visible light organophotoredox catalysis has emerged as an invaluable tool for organic synthetic transformations since it works brilliantly in tandem with organic substrates and has been known to create unique chemical environment for organic transformations. Dicyanopyrazine (DPZ), a relatively lesser researched organophotoredox catalyst, has shown great potential through its catalytic activity in organic synthesis and necessitates attention of synthetic community. Full article
(This article belongs to the Special Issue Photoredox Catalysis 2021)
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21 pages, 6167 KB  
Article
9,10-Phenanthrenedione as Visible-Light Photoredox Catalyst: A Green Methodology for the Functionalization of 3,4-Dihydro-1,4-Benzoxazin-2-Ones through a Friedel-Crafts Reaction
by Jaume Rostoll-Berenguer, Gonzalo Blay, José R. Pedro and Carlos Vila
Catalysts 2018, 8(12), 653; https://doi.org/10.3390/catal8120653 - 12 Dec 2018
Cited by 22 | Viewed by 6902
Abstract
A visible-light photoredox functionalization of 3,4-dihydro-1,4-benzoxazin-2-ones through a Friedel-Crafts reaction with indoles using an inexpensive organophotoredox catalyst is described. The reaction uses a dual catalytic system that is formed by a photocatalyst simple and cheap, 9,10-phenanthrenedione, and a Lewis acid, Zn(OTf)2. [...] Read more.
A visible-light photoredox functionalization of 3,4-dihydro-1,4-benzoxazin-2-ones through a Friedel-Crafts reaction with indoles using an inexpensive organophotoredox catalyst is described. The reaction uses a dual catalytic system that is formed by a photocatalyst simple and cheap, 9,10-phenanthrenedione, and a Lewis acid, Zn(OTf)2. 5W white LEDs are used as visible-light source and oxygen from air as a terminal oxidant, obtaining the corresponding products with good yields. The reaction can be extended to other electron-rich arenes. Our methodology represents one of the most valuable and sustainable approach for the functionalization of 3,4-dihydro-1,4-benzoxazin-2-ones, as compared to the reported procedures. Furthermore, several transformations were carried out, such as the synthesis of the natural product cephalandole A and a tryptophol derivative. Full article
(This article belongs to the Special Issue Photocatalytic Organic Synthesis)
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