Chiral N-heterocyclic carbene/Lewis acid cooperative catalysis of the reaction of 2-aroylvinylcinnamaldehydes: a switch of the reaction pathway by Lewis acid activation

2016 ◽  
Vol 52 (4) ◽  
pp. 788-791 ◽  
Author(s):  
Zhan-Yong Wang ◽  
Ya-Li Ding ◽  
Gang Wang ◽  
Ying Cheng
Keyword(s):  
Lewis Acid ◽  
Reaction Pathway ◽  
Acid Activation ◽  
Cooperative Catalysis ◽  
Intermolecular Reaction

Chiral N-heterocyclic carbene/Lewis acid co-catalyzed reaction of 2-aroylvinylcinnamaldehydes produced good yields of indeno[1,2-c]furan-1-ones with excellent enantioselectivity. A switch of intramolecular to intermolecular reaction was achieved by the cooperative catalysis of NHC/Ti(OPr-i)4 catalysts.

scholarly journals Metal–ligand–Lewis acid multi-cooperative catalysis: a step forward in the Conia-ene reaction

2021 ◽  
Vol 12 (1) ◽  
pp. 435-441
Author(s):  
Arnaud Clerc ◽  
Enrico Marelli ◽  
Nicolas Adet ◽  
Julien Monot ◽  
Blanca Martín-Vaca ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Acid Activation ◽  
Ene Reaction ◽  
Cooperative Catalysis ◽  
Metal Ligand

An original multi-cooperative catalytic approach was developed by combining metal–ligand cooperation and Lewis acid activation.

Catalytic Carbonyl-Olefin Metathesis of Aliphatic Ketones: Iron(III) HomoDimers as Lewis Acidic Superelectrophiles

2018 ◽  
Author(s):  
Haley Albright ◽  
Paul S. Riehl ◽  
Christopher C. McAtee ◽  
Jolene P. Reid ◽  
Jacob R. Ludwig ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Olefin Metathesis ◽  
Acid Activation ◽  
Lewis Acid Catalysts ◽  
Distinct Mode ◽  
Aliphatic Ketones ◽  
Carbon Carbon Bond ◽  
Metathesis Reactions ◽  
Acid Catalyzed

<div>Catalytic carbonyl-olefin metathesis reactions have recently been developed as a powerful tool for carbon-carbon bond</div><div>formation. However, currently available synthetic protocols rely exclusively on aryl ketone substrates while the corresponding aliphatic analogs remain elusive. We herein report the development of Lewis acid-catalyzed carbonyl-olefin ring-closing metathesis reactions for aliphatic ketones. Mechanistic investigations are consistent with a distinct mode of activation relying on the in situ formation of a homobimetallic singly-bridged iron(III)-dimer as the active catalytic species. These “superelectrophiles” function as more powerful Lewis acid catalysts that form upon association of individual iron(III)-monomers. While this mode of Lewis acid activation has previously been postulated to exist, it has not yet been applied in a catalytic setting. The insights presented are expected to enable further advancement in Lewis acid catalysis by building upon the activation principle of “superelectrophiles” and broaden the current scope of catalytic carbonyl-olefin metathesis reactions.</div>

Efficient Phosphodiester Binding and Cleavage by a ZnII Complex Combining Hydrogen-Bonding Interactions and Double Lewis Acid Activation

2006 ◽  
Vol 45 (42) ◽  
pp. 7056-7059 ◽  
Author(s):  
Guoqiang Feng ◽  
Daniela Natale ◽  
Ravi Prabaharan ◽  
Juan C. Mareque-Rivas ◽  
Nicholas H. Williams
Keyword(s):  
Hydrogen Bonding ◽  
Lewis Acid ◽  
Acid Activation ◽  
Hydrogen Bonding Interactions

Highly effective Brønsted base/lewis acid cooperative catalysis: a new Cd metal–organic framework for the synthesis of Hantzsch 1,4-DHPs at ambient temperature

2017 ◽  
Vol 41 (24) ◽  
pp. 15475-15484 ◽  
Author(s):  
Farzaneh Rouhani ◽  
Ali Morsali
Keyword(s):  
Ambient Temperature ◽  
Lewis Acid ◽  
Functional Group ◽  
Metal Organic Framework ◽  
Cooperative Catalysis ◽  
Highly Effective ◽  
Metal Organic ◽  
Brønsted Base ◽  
Organic Framework

A new 3D metal–organic framework {[Cd3(BDC)3(OPP)(DMF)2]·2DMA}n (TMU-33) has been synthesized. The performance of the imine functional group of the OPP ligand as a Brønsted base and open Cd site as a Lewis acid in this framework was investigated as cooperative catalyst.

Hydrosilylation of Carbonyls Catalyzed by Hydridoborenium Borate Salts: Lewis Acid Activation and Anion Mediated Pathways

2020 ◽  
Vol 59 (10) ◽  
pp. 7195-7203 ◽  
Author(s):  
Sandeep Rawat ◽  
Mamta Bhandari ◽  
Vishal Kumar Porwal ◽  
Sanjay Singh
Keyword(s):  
Lewis Acid ◽  
Acid Activation ◽  
Borate Salts

Ru alkylidene compounds bearing tridentate, dianionic ligands: Lewis acid activation and olefin metathesis

2016 ◽  
Vol 45 (9) ◽  
pp. 3844-3852 ◽  
Author(s):  
Adam M. McKinty ◽  
Douglas W. Stephan
Keyword(s):  
Lewis Acid ◽  
Olefin Metathesis ◽  
Acid Activation ◽  
Dianionic Ligands

The series of tridentate complexes were prepared and shown to react with BCl3 to give the complexes affording neutral and cationic complexes sequentially. The generated five coordinate cations were evaluated in standard preliminary tests for olefin metathesis catalysis.

Sign in / Sign up

Export Citation Format

Share Document