scholarly journals Front Cover Picture: Photoredox Catalysis in C-S Bond Construction: Recent Progress in Photo-Catalyzed Formation of Sulfones and Sulfoxides (Adv. Synth. Catal. 3/2018)

2017 ◽  
Vol 360 (3) ◽  
pp. 385-385 ◽  
Author(s):  
Jie Zhu ◽  
Wen-Chao Yang ◽  
Xiao-dong Wang ◽  
Lei Wu
Keyword(s):  
Recent Progress ◽  
Photoredox Catalysis ◽  
Front Cover

scholarly journals An overview on disulfide-catalyzed and -cocatalyzed photoreactions

2020 ◽  
Vol 16 ◽  
pp. 1418-1435 ◽  
Author(s):  
Yeersen Patehebieke
Keyword(s):  
Electron Transfer ◽  
Hydrogen Atom ◽  
Recent Progress ◽  
Hydrogen Atom Transfer ◽  
Present Review ◽  
Photoredox Catalysis ◽  
Multiple Bonds ◽  
Thiyl Radicals ◽  
Mild Conditions ◽  
Photocatalytic Reactions

Disulfides are versatile catalysts. They can be photocatalysts, hydrogen atom transfer (HAT) catalysts, cocatalysts, or initiators in photocatalytic reactions. Under photoirradiation, organic disulfides can be easily cleaved into free thiyl radicals (RS•) and can reversibly add to unsaturated multiple bonds to catalyze a variety of functionalization reactions under mild conditions. In photoredox catalysis reactions, an excellent electron transfer ability and excellent radical properties also made these thiyl radicals powerful HAT catalysts. They have increasingly been proven useful in various types of organic photoreactions, such as cyclizations, anti-Markovnikov additions, aromatic olefin carbonylations, isomerizations, etc. They are a class of green, economic, mild, and chemoselective radical catalysts that deserve more attention. The present review highlights the recent progress in the field of disulfide-catalyzed and -cocatalyzed photocatalytic reactions for different reaction types.

Pyrylium Salts: Selective Reagents for the Activation of Primary Amino Groups in Organic Synthesis

Synthesis ◽  
2019 ◽  
Vol 52 (04) ◽  
pp. 489-503 ◽  
Author(s):  
Yue Pang ◽  
Daniel Moser ◽  
Josep Cornella
Keyword(s):  
Recent Progress ◽  
Rapid Development ◽  
Historical Context ◽  
Building Blocks ◽  
Short Review ◽  
Pyridinium Salts ◽  
Photoredox Catalysis ◽  
Amino Groups ◽  
Pyrylium Salts ◽  
Primary Amino

Primary amino groups represent an ubiquitous category of functionalities in synthetic building blocks, drugs, and natural products. Therefore, such functionalities offer themselves as perfect handles for late-stage functionalization, and the development of robust and efficient strategies to transform these groups is highly desirable. Despite the extremely challenging activation of the C–N bond, the past few years have witnessed the rapid development of deaminative transformations using pyrylium salts as activating reagents. In most cases, the pyridinium salts formed were activated by single electron transfer, giving alkyl radicals which were used in a series of transformations via nickel and photoredox catalysis. This short review aims to give an overview to related properties of pyrylium salts, their historical significance, and summarize the recent progress in the field of deaminative transformations using these reagents.1 Introduction2 Pyrylium and Pyridinium Salts2.1 Historical Context2.2 Structure and Reactivity2.3 Pyrylium Synthesis2.4 Historical Context of the Reactivity of Pyridinium Salts3 Recent Progress on Deaminative Transformations of Primary Amino Groups by Pyrylium Salts3.1 Metal-Catalyzed Cross-Couplings3.2 Photoredox Catalysis and Photoinduced Reactions for C–C Bond Constructions3.3 Borylations3.4 SNAr Functionalization of Aminoheterocycles4 Conclusion

scholarly journals Front Cover: Employing Photoredox Catalysis for DNA-Encoded Chemistry: Decarboxylative Alkylation of α-Amino Acids (ChemMedChem 20/2018)

ChemMedChem ◽  
2018 ◽  
Vol 13 (20) ◽  
pp. 2132-2132 ◽  
Author(s):  
Dominik K. Kölmel ◽  
Richard P. Loach ◽  
Thomas Knauber ◽  
Mark E. Flanagan
Keyword(s):  
Amino Acids ◽  
Photoredox Catalysis ◽  
Front Cover

scholarly journals Inside Front Cover: Design of polymers for siRNA delivery: Recent progress and challenges (View 3/2021)

View ◽  
2021 ◽  
Vol 2 (3) ◽  
Author(s):  
Hui Wang ◽  
Song Zhang ◽  
Jia Lv ◽  
Yiyun Cheng
Keyword(s):  
Recent Progress ◽  
Sirna Delivery ◽  
Front Cover ◽  
Cover Design
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