A facile access to substituted benzo[a]fluorenes from o-alkynylbenzaldehydes via in situ formed acetals

2014 ◽  
Vol 50 (69) ◽  
pp. 9925-9928 ◽  
Author(s):  
Seetharaman Manojveer ◽  
Rengarajan Balamurugan
Keyword(s):  
Reaction Pathway ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Catalysed Reaction ◽  
Brönsted Acid ◽  
Trimethyl Orthoformate

Brønsted acid catalysed reaction of o-alkynylbenzaldehydes with arylalkynes in the presence of trimethyl orthoformate takes a different reaction pathway and results in benzo[a]fluorenes.

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.

Lewis or Brønsted acid-catalysed reaction of propargylic alcohol-tethered alkylidenecyclopropanes with indoles and pyrroles for the preparation of polycyclic compounds tethered with indole or pyrrole motif

2020 ◽  
Vol 18 (1) ◽  
pp. 135-139 ◽  
Author(s):  
Hao-Zhao Wei ◽  
Liu-Zhu Yu ◽  
Min Shi
Keyword(s):  
Synthetic Method ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Pyrrole Derivatives ◽  
Polycyclic Compounds ◽  
Catalysed Reaction ◽  
Brönsted Acid ◽  
Propargylic Alcohol

We developed a facile synthetic method to access the cyclopenta[b]naphthalene skeleton from Lewis or Brønsted acid-catalysed propargylic alcohol-tethered alkylidenecyclopropanes with indole and pyrrole derivatives.

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

In situ formed acetals facilitated direct Michael addition of unactivated ketones

2017 ◽  
Vol 41 (3) ◽  
pp. 1186-1192 ◽  
Author(s):  
Srinivasa Rao Koppolu ◽  
Rengarajan Balamurugan
Keyword(s):  
Michael Addition ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Brönsted Acid

A facile Michael addition of unactivated ketones under Brønsted acid conditions for the synthesis of 1,5-diketones.

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