scholarly journals Chiral phosphine-mediated intramolecular [3 + 2] annulation: enhanced enantioselectivity by achiral Brønsted acid

2017 ◽  
Vol 8 (7) ◽  
pp. 5196-5200 ◽  
Author(s):  
Weijun Yao ◽  
Zhaoyuan Yu ◽  
Shan Wen ◽  
Huanzhen Ni ◽  
Nisar Ullah ◽  
...  
Keyword(s):  
Amino Acid ◽  
Bronsted Acids ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Brönsted Acid

Enantioselective intramolecular [3 + 2] annulation of chalcone–allenes catalyzed by amino acid-derived phosphines and achiral Brønsted acids has been developed.

scholarly journals Electrochemical hydrogenation of α-ketoesters and benzoxazinones using carbon electrodes and a sustainable Brønsted acid

2021 ◽  
Author(s):  
Dion B. Nemez ◽  
Baldeep K. Sidhu ◽  
Patrick K. Giesbrecht ◽  
Jason D. Braun ◽  
David E. Herbert
Keyword(s):  
Carbon Electrodes ◽  
Bronsted Acids ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Electrochemical Hydrogenation ◽  
Brönsted Acid

A convenient electrochemical methodology for the hydrogenation of benzoxazinones and aryl-substituted α-ketoester substrates is presented, using carbon electrodes and sustainable Brønsted acids.

P-Chiral, N-phosphoryl sulfonamide Brønsted acids with an intramolecular hydrogen bond interaction that modulates organocatalysis

2019 ◽  
Vol 17 (38) ◽  
pp. 8690-8694 ◽  
Author(s):  
Minglei Yuan ◽  
Ifenna I. Mbaezue ◽  
Zhi Zhou ◽  
Filip Topic ◽  
Youla S. Tsantrizos
Keyword(s):  
Hydrogen Bond ◽  
Intramolecular Hydrogen Bond ◽  
Transfer Hydrogenation ◽  
Bronsted Acids ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Hydrogen Bond Interaction ◽  
Bond Interaction ◽  
Brönsted Acid ◽  
Intramolecular Hydrogen

An intramolecular H-bond in the Brønsted acid OttoPhosa I accelerates the reaction and increases enantioselectivity for the transfer hydrogenation of quinolines.

scholarly journals [1,3]/[1,4]-Sulfur atom migration in β-hydroxyalkylphosphine sulfides

2020 ◽  
Vol 16 ◽  
pp. 88-105
Author(s):  
Katarzyna Włodarczyk ◽  
Piotr Borowski ◽  
Marek Stankevič
Keyword(s):  
Dft Calculations ◽  
Lewis Acid ◽  
Sulfur Atom ◽  
Bronsted Acids ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Carbon Migration ◽  
Brönsted Acid ◽  
Atom Migration ◽  
Insight Into

β-Hydroxyalkylphosphine sulfides undergo [1,3]- or [1,4]-sulfur atom phosphorus-to-carbon migration in the presence of Lewis or Brønsted acids. The direction of sulfur atom migration depends on the type of acid used for the reaction. In the presence of a Brønsted acid, mainly [1,3]-rearrangement is observed, whereas a Lewis acid catalyzes the [1,4]-sulfur migration. To gain insight into the mechanism of these transformations, the stereochemistry of these rearrangements have been tested, along with the conduction of some control experiments and DFT calculations.

scholarly journals Organocatalytic Synthesis of α,α–Diaryl Substituted α–Amino Acid Derivatives by an Interrupted Three-Component Ugi Reaction

2019 ◽  
Vol 92 (2) ◽  
pp. 203-209 ◽  
Author(s):  
Danijel Glavač ◽  
Ivanka Jerić ◽  
Matija Gredičak
Keyword(s):  
Reaction Mechanism ◽  
Amino Acid ◽  
Ugi Reaction ◽  
Amino Acid Derivatives ◽  
Acid Catalysts ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Brönsted Acid ◽  
Bronsted Acid Catalysts

An organocatalytic interrupted three-component Ugi reaction for the synthesis of α,α–diaryl α–amino acid derivatives is described. The transformation proceeds with a range of isocyanides and 3-aryl isoindolinone alcohols using Brønsted acid catalysts to afford products in good to excellent yields. Based on the obtained results, a reaction mechanism is proposed and discussed.

[HL2][P(1,2-O2C6Cl4)3] (L = THF, DMF): Brønsted acid initiators for the polymerization of n-butyl vinyl ether and p-methoxystyrene

2017 ◽  
Vol 46 (18) ◽  
pp. 5901-5910 ◽  
Author(s):  
Khatera Hazin ◽  
Spencer C. Serin ◽  
Brian O. Patrick ◽  
Maria B. Ezhova ◽  
Derek P. Gates
Keyword(s):  
Vinyl Ether ◽  
Bronsted Acids ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Brönsted Acid

The development of solid, weighable Brønsted acids featuring the hexacoordinated phosphorous(v) anion [TRISPHAT]− are reported.

scholarly journals Brønsted Acid Catalysed Aerobic Reduction of Olefins by Diimide Generated In Situ from Hydrazine

SynOpen ◽  
2017 ◽  
Vol 01 (01) ◽  
pp. 0011-0014
Author(s):  
Yukihiro Arakawa ◽  
Takahiro Kohda ◽  
Keiji Minagawa ◽  
Yasushi Imada
Keyword(s):  
Bronsted Acids ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Mild Conditions ◽  
Brönsted Acid

Aerobic reduction of olefins with hydrazine was proven to be efficiently catalysed by readily available Brønsted acids, such as p-tolu­enesulfonic acid monohydrate, providing hydrogenated products in very good yields and chemoselectivity under mild conditions.

Asymmetric synthesis of isoquinolinonaphthyridines catalyzed by a chiral Brønsted acid

2017 ◽  
Vol 15 (31) ◽  
pp. 6474-6477 ◽  
Author(s):  
Jianjun Li ◽  
Yiwei Fu ◽  
Cong Qin ◽  
Yang Yu ◽  
Hao Li ◽  
...  
Keyword(s):  
Asymmetric Synthesis ◽  
Cyclization Reaction ◽  
Bronsted Acids ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Brönsted Acid ◽  
Chiral Bronsted Acid ◽  
Chiral Brønsted Acids

A mild and efficient asymmetric cyclization reaction catalyzed by chiral Brønsted acids has been developed for the synthesis of chiral isoquinolinonaphthyridines.

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