Enantioselective photooxygenation of β-dicarbonyl compounds in batch and flow photomicroreactors

2019 ◽  
Vol 17 (34) ◽  
pp. 7938-7942 ◽  
Author(s):  
Xiao-Fei Tang ◽  
Jing-Nan Zhao ◽  
Yu-Feng Wu ◽  
Ze-Hao Zheng ◽  
Shi-Hao Feng ◽  
...  
Keyword(s):  
Phase Transfer ◽  
Aerobic Oxidation ◽  
Dicarbonyl Compounds ◽  
Phase Transfer Catalysts

A series of C-2′ modified cinchonine-derived phase-transfer catalysts were synthesized and applied to the photo-organocatalytic aerobic oxidation of β-dicarbonyl compounds in batch and flow photomicroreactors.

Asymmetric α-hydroxylation of β-dicarbonyl compounds by C-2′ modified cinchonine-derived phase-transfer catalysts in batch and flow microreactors

2020 ◽  
Vol 50 (16) ◽  
pp. 2478-2487
Author(s):  
Xiao-Fei Tang ◽  
Jing-Nan Zhao ◽  
Yu-Feng Wu ◽  
Ze-Hao Zheng ◽  
Cun-Fei Ma ◽  
...  
Keyword(s):  
Phase Transfer ◽  
Dicarbonyl Compounds ◽  
Phase Transfer Catalysts ◽  
Flow Microreactors

Green Application of Phase-Transfer Catalysis in Oxidation: A Comprehensive Review

2020 ◽  
Vol 17 (4) ◽  
pp. 405-411
Author(s):  
Chuan-Hui Wang ◽  
Chen-Fu Liu ◽  
Guo-Wu Rao
Keyword(s):  
Organic Chemistry ◽  
Green Chemistry ◽  
Oxidation Reaction ◽  
Phase Transfer Catalysis ◽  
Phase Transfer ◽  
Important Application ◽  
Oxidation Reactions ◽  
Comprehensive Review ◽  
Phase Transfer Catalysts ◽  
Onium Salts

Oxidation reactions have emerged as one of the most versatile tools in organic chemistry. Various onium salts such as ammonium, phosphonium, arsonium, bismuthonium, tellurium have been used as phase transfer catalysts in many oxidation reactions. Certainly, considerable catalysts have been widely used in Phase-Transfer Catalysis (PTC). This review focuses on the application of PTC in various oxidation reaction. Furthermore, PTC also conforms to the concept of “Green Chemistry”. <p></p> • Oxidation has become one of the most widely used tools in organic chemistry and phase transfer catalysts has been widely used in oxidation. <p></p> • The application of phase transfer catalysts in oxidation reaction will be summarized. <p></p> • Phase transfer catalysts have important application in various oxidation reaction.

Organocatalyzed Heterocyclic Transformations In Green Media: A Review

2020 ◽  
Vol 07 ◽  
Author(s):  
Neslihan Demirbas ◽  
Ahmet Demirbas
Keyword(s):  
Hydrogen Bonding ◽  
Phase Transfer ◽  
Noncovalent Interactions ◽  
Binding Capacity ◽  
Chemical Transformations ◽  
Organic Transformations ◽  
Phase Transfer Catalysts ◽  
Waste Production ◽  
Synthetic Methodologies ◽  
Organocatalytic Reactions

Background: Since the discovery of metal-free catalysts or organocatalysts about twenty years ago, a number of small molecules with different structures have been using to accelerate organic transformations. With the development of environmental awareness, in order to obtain highly privileged scaffolds, scientists have directed their studies towards the synthetic methodologies which minimize or preferably eliminate the formation of waste, avoid from toxic solvents and reagents and use renewable starting materials as far as possible. Methods: In this connection, the organocatalytic reactions providing efficiency and selectivity for most of case have become an endless topic in organic chemistry since several advantages from both practical and environmental standpoints. Organocatalysts supplying transformation of reactants into products with the least possible waste production have been serving to the concept of green chemistry. Results and Conclusion: Organocatalysts have been classified on the basis of their binding capacity to the substrate with covalently or noncovalent interactions involving hydrogen bonding and electrostatic interaction. Diverse types of small organic compounds including proline and its derivatives, phase-transfer catalysts, (thio)urease, phosphoric acids, sulfones, N-oxides, guanidines, cinchona derivatives, aminoindanol and amino acids have been utilized as hydrogen bonding organocatalysts in different chemical transformations.

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