A catalytic system with high efficiency and recyclability based on Suzuki and Heck reaction in aqueous admicellar medium

2020 ◽  
Vol 34 (4) ◽  
Author(s):  
Hao Zhang ◽  
Ji‐Hua Zhu ◽  
Fei Hou ◽  
Zheng‐Jun Quan ◽  
Xi‐Cun Wang
Keyword(s):  
Catalytic System ◽  
Heck Reaction ◽  
High Efficiency

scholarly journals Bis-NHC–Ag/Pd(OAc)2 Catalytic System Catalyzed Transfer Hydrogenation Reaction

Catalysts ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 8
Author(s):  
Hui-Ju Chen ◽  
Chien-Cheng Chiu ◽  
Tsui Wang ◽  
Dong-Sheng Lee ◽  
Ta-Jung Lu
Keyword(s):  
Functional Groups ◽  
Catalytic System ◽  
High Efficiency ◽  
Aqueous Media ◽  
Hydrogenation Reaction ◽  
Transfer Hydrogenation ◽  
Terminal Alkynes ◽  
Wide Range ◽  
Transfer Hydrogenation Reaction

The bis-NHC–Ag/Pd(OAc)2 catalytic system (NHC = N-heterocyclic carbene), a combination of bis-NHC–Ag complex and Pd(OAc)2, was found to be a smart catalyst in the Pd-catalyzed transfer hydrogenation of various functionalized arenes and internal/terminal alkynes. The catalytic system demonstrated high efficiency for the reduction of a wide range of various functional groups such as carbonyls, alkynes, olefins, and nitro groups in good to excellent yields and high chemoselectivity for the reduction of functional groups. In addition, the protocol was successfully exploited to stereoselectivity for the transformation of alkynes to alkenes in aqueous media under air. This methodology successfully provided an alternative useful protocol for reducing various functional groups and a simple operational protocol for transfer hydrogenation.

scholarly journals Ionic Pd/NHC Catalytic System Enables Recoverable Homogeneous Catalysis: Mechanistic Study and Application in the Mizoroki–Heck Reaction

2019 ◽  
Vol 25 (72) ◽  
pp. 16439-16439
Author(s):  
Dmitry B. Eremin ◽  
Ekaterina A. Denisova ◽  
Alexander Yu. Kostyukovich ◽  
Jonathan Martens ◽  
Giel Berden ◽  
...  
Keyword(s):  
Homogeneous Catalysis ◽  
Catalytic System ◽  
Heck Reaction ◽  
Mechanistic Study

High-efficiency treatment of benzaldehyde residue using two-stage fluidized-bed/fixed-bed catalytic system

2019 ◽  
Vol 41 (22) ◽  
pp. 2898-2906 ◽  
Author(s):  
Qing Liu ◽  
Rongjie Chen ◽  
Maorong Zeng ◽  
Zhaoyang Fei ◽  
Xian Chen ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Catalytic System ◽  
High Efficiency ◽  
Fixed Bed ◽  
Two Stage

A one-pot synthesis of benzimidazoles via aerobic oxidative condensation of benzyl alcohols with o-phenylenediamines catalyzed by [MIMPs]+Cl-/NaNO2/TEMPO

2020 ◽  
Vol 44 (9-10) ◽  
pp. 557-565
Author(s):  
Zhenzhen Geng ◽  
Hong-yu Zhang ◽  
Guohui Yin ◽  
Yuecheng Zhang ◽  
Jiquan Zhao
Keyword(s):  
Ionic Liquid ◽  
Catalytic System ◽  
Sodium Nitrite ◽  
High Efficiency ◽  
Oxidative Condensation ◽  
Imidazolium Chloride ◽  
One Pot ◽  
Benzyl Alcohols ◽  
One Pot Synthesis ◽  
The One

The ionic liquid 1-methyl-3-(3-sulfopropyl)imidazolium chloride ([MIMPs]+Cl-) in combination with 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) and sodium nitrite (NaNO2) as a catalytic system demonstrates high efficiency in the one-pot two-step aerobic oxidative condensation of benzyl alcohols with 1,2-phenylenediamines to give benzimidazoles. Various benzimidazoles are obtained in good to excellent yields by this strategy.

Au@zirconium-phosphonate nanoparticles as an effective catalytic system for the chemoselective and switchable reduction of nitroarenes

2019 ◽  
Vol 21 (3) ◽  
pp. 614-626 ◽  
Author(s):  
Francesco Ferlin ◽  
Matteo Cappelletti ◽  
Riccardo Vivani ◽  
Monica Pica ◽  
Oriana Piermatti ◽  
...  
Keyword(s):  
Catalytic System ◽  
Zirconium Phosphate ◽  
High Efficiency ◽  
Reducing Agent ◽  
Layer Surface ◽  
Flow Conditions ◽  
Zirconium Phosphonate

Zirconium phosphate bearing aminoethyl groups on the layer surface, ZP(AEP), was used to immobilize AuNPs. The gold-based catalyst proved its high efficiency for the chemoselective reduction of nitroarenes under both batch and flow conditions by using NaBH4 as a reducing agent.

Thermoregulated Aqueous Biphasic Catalysis of Sonogashira Reactions

2015 ◽  
Vol 68 (10) ◽  
pp. 1614 ◽  
Author(s):  
Xiaohua Zhao ◽  
Xiang Liu ◽  
Ming Lu
Keyword(s):  
Catalytic System ◽  
Catalytic Reaction ◽  
High Efficiency ◽  
The Novel ◽  
Biphasic Catalysis ◽  
Co Catalyst ◽  
Highly Efficient ◽  
Water Based ◽  
Aqueous Biphasic ◽  
Sonogashira Reactions

A water-based thermoregulated system for Pd-catalyzed Sonogashira reactions is presented, which allows for not only a highly efficient homogeneous catalytic reaction, but also an easy separation/recovery of the catalyst. The novel catalytic system exhibits high efficiency and excellent reusability. In addition, the Sonogashira reactions are performed with Pd(OAc)2 without a copper co-catalyst.

Pd catalyzed Heck reaction with the catalytic system [Pd(Ph2PC6H4-2-(CH2NMe2))(SRF)2]

2005 ◽  
Vol 233 (1-2) ◽  
pp. 17-27 ◽  
Author(s):  
Jaime G. Fierro-Arias ◽  
Rocío Redón ◽  
Juventino J. García ◽  
Simón Hernández-Ortega ◽  
Rubén A. Toscano ◽  
...  
Keyword(s):  
Catalytic System ◽  
Heck Reaction

Catalytic System for the Heck Reaction of Fluorinated Haloaryls

2005 ◽  
Vol 24 (15) ◽  
pp. 3679-3684 ◽  
Author(s):  
Ana C. Albéniz ◽  
Pablo Espinet ◽  
Blanca Martín-Ruiz ◽  
David Milstein
Keyword(s):  
Catalytic System ◽  
Heck Reaction

scholarly journals Site-selective Amide Functionalization by Catalytic Azoline Engrafting

2021 ◽  
Author(s):  
Wyatt Powell ◽  
Garrett Evenson ◽  
Maciej Walczak
Keyword(s):  
Natural Products ◽  
Catalytic System ◽  
High Selectivity ◽  
High Efficiency ◽  
Unmet Need ◽  
Direct Conversion ◽  
Amide Group ◽  
Site Selective ◽  
Selection Of ◽  
General Method

Amide activation is a challenging transformation due to the stabilizing effect of the amide group. While enzymes can be considered as prototypical systems that have evolved to achieve high selectivity and specificity, small-molecule catalysts that functionalize the amide group may accommodate a much larger selection of substrates but currently re-main scarce. Here, by combining the desired features from both catalytic regimes we designed an artificial cyclodehy-dratase, a catalytic system for site-selective modification of peptides and natural products by engrafting heterocyclic into their scaffolds. The catalytic system features molybdenum(VI) center that was decorated with a sterically congest-ed tripod ligand. The optimized catalyst can introduce azolines into small molecules, natural products, and oligopeptides with high efficiency and minimal waste. We further demonstrate the utility of the new protocol in direct func-tionalization of a single amide group in the presence of up to seven other chemically similar positions, and direct conversion into amines and thioamides. This new mechanistic paradigm may address an unmet need for a general method for selective and sustainable functionalization of peptides and natural products.

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