Brønsted acid-catalysed intramolecular hydroamination of unactivated alkenes: metal triflates as an in situ source of triflic acid

2017 ◽  
Vol 46 (9) ◽  
pp. 2884-2891 ◽  
Author(s):  
Junqi Chen ◽  
Sarah K. Goforth ◽  
Bradley A. McKeown ◽  
T. Brent Gunnoe
Keyword(s):  
Catalyst Precursor ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Triflic Acid ◽  
Brönsted Acid ◽  
Metal Triflates

Hydroamination of alkenes using metal triflates occurs via the production of triflic acid, which serves as a catalyst precursor.

Facile synthesis of chiral indolines through asymmetric hydrogenation of in situ generated indoles

2018 ◽  
Vol 5 (19) ◽  
pp. 2805-2809 ◽  
Author(s):  
Chang-Bin Yu ◽  
Jie Wang ◽  
Yong-Gui Zhou
Keyword(s):  
Asymmetric Hydrogenation ◽  
Hydrogenation Process ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Facile Synthesis ◽  
One Pot ◽  
Brönsted Acid ◽  
Palladium Catalyzed ◽  
Intramolecular Condensation

A concise synthesis of chiral indolines has been developed through intramolecular condensation, deprotection and palladium-catalyzed asymmetric hydrogenation in a one-pot process with up to 96% ee. A strong Brønsted acid played an important role in both the formation of indoles and asymmetric hydrogenation process.

Brønsted Acid-catalyzed Dynamic Kinetic Resolution of in situ Formed Acyclic N,O-hemiaminals: Cascade Synthesis of Chiral Cyclic N,O-aminals

2021 ◽  
Author(s):  
Xue-Jiao Lv ◽  
Yong-Chao Ming ◽  
Hui-Chun Wu ◽  
Yankai Liu
Keyword(s):  
Kinetic Resolution ◽  
Michael Reaction ◽  
Amide Group ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Dynamic Kinetic Resolution ◽  
Brönsted Acid ◽  
Acid Catalyzed

A Brønsted acid-catalyzed cascade acyclic N,O-hemiaminal formation/oxa-Michael reaction is developed for the synthesis of cis-2,6-disubstituted tetrahydropyrans bearing an exo amide group, that is, cyclic N,O-aminals. By using TsOH, various different...

Effect of H-Bonding on Brønsted Acid Ionic Liquids Catalyzed In Situ Transesterification of Wet Algae

2020 ◽  
Vol 8 (11) ◽  
pp. 4647-4657
Author(s):  
Tian Ma ◽  
Zhensheng Shen ◽  
Huan Li ◽  
An Li ◽  
Qian Feng ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
In Situ Transesterification ◽  
Brönsted Acid

Aminoxylation of Thioalkynes through Radical-Polar Crossover

Synlett ◽  
2019 ◽  
Vol 31 (06) ◽  
pp. 592-594
Author(s):  
Giovanni Di Mauro ◽  
Martina Drescher ◽  
Sara Tkaczyk ◽  
Nuno Maulide
Keyword(s):  
Bronsted Acid ◽  
Brønsted Acid ◽  
Reaction Conditions ◽  
One Pot ◽  
Brönsted Acid ◽  
Direct Formation

A one-pot procedure for the aminoxylation of thioalkynes for the direct formation of α-functionalized thioesters under mild reaction conditions is reported. A ketenethionium ion is the key intermediate, which is generated in situ by Brønsted acid mediated protonation and undergoes a radical-polar crossover.

Synthesis of tertiary amines by direct Brønsted acid catalyzed reductive amination

2020 ◽  
Vol 56 (61) ◽  
pp. 8691-8694
Author(s):  
Mohanad A. Hussein ◽  
An H. Dinh ◽  
Vien T. Huynh ◽  
Thanh Vinh Nguyen
Keyword(s):  
Carbonyl Compounds ◽  
Reductive Amination ◽  
Bronsted Acid ◽  
Tertiary Amines ◽  
Brønsted Acid ◽  
Triflic Acid ◽  
Brönsted Acid ◽  
Acid Catalyzed

Triflic acid efficiently promotes the reductive amination reactions of carbonyl compounds on a broad range of substrates.

Catalytic Asymmetric Cycloaddition of In Situ-Generated ortho -Quinone Methides and Azlactones by a Triple Brønsted Acid Activation Strategy

2016 ◽  
Vol 22 (20) ◽  
pp. 6774-6778 ◽  
Author(s):  
Xiao-Ye Yu ◽  
Jia-Rong Chen ◽  
Qiang Wei ◽  
Hong-Gang Cheng ◽  
Zhi-Cheng Liu ◽  
...  
Keyword(s):  
Acid Activation ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Quinone Methides ◽  
Brönsted Acid ◽  
Catalytic Asymmetric
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