Asymmetric Transfer Hydrogenation ofα,β-Unsaturated Carbonyl Compounds to Saturated Alcohols as Catalyzed by Iridium Complexes of Tricyclic Bioxazoline-Fused Imidazole-Derived N-Heterocyclic Carbene Ligands

2019 ◽  
Vol 4 (1) ◽  
pp. 357-365 ◽  
Author(s):  
Balasubramaniyam Ramasamy ◽  
Prakasham. A. P ◽  
Manoj Kumar Gangwar ◽  
Prasenjit Ghosh
Keyword(s):  
Carbonyl Compounds ◽  
Transfer Hydrogenation ◽  
Iridium Complexes ◽  
Asymmetric Transfer Hydrogenation ◽  
Carbene Ligands

Selective Reduction of Carbonyl Compounds via (Asymmetric) Transfer Hydrogenation on Heterogeneous Catalysts

Synthesis ◽  
2020 ◽  
Vol 52 (04) ◽  
pp. 504-520 ◽  
Author(s):  
Eszter Baráth
Keyword(s):  
Asymmetric Catalysis ◽  
Carbonyl Compounds ◽  
Heterogeneous Catalysts ◽  
Selective Reduction ◽  
Short Review ◽  
Transfer Hydrogenation ◽  
Chemical Transformations ◽  
Asymmetric Transfer Hydrogenation ◽  
Immobilized Catalysts ◽  
Main Challenge

Based on the ever-increasing demand for optically pure compounds, the development of efficient methods to produce such products is very important. Homogeneous asymmetric catalysis occupies a prominent position in the ranking of chemical transformations, with transition metals coordinated to chiral ligands being applied extensively for this purpose. However, heterogeneous catalysts have the ability to further extend the field of asymmetric transformations, because of their beneficial properties such as high stability, ease of separation and regeneration, and the possibility to apply them in continuous processes. The main challenge is to find potential synthetic routes that can provide a chemically and thermally stable heterogeneous catalyst having the necessary chiral information, whilst keeping the catalytic activity and enantioselectivity equally high (or even higher) than the corresponding homogeneous counterpart. Within this short review, the most relevant immobilization modes and preparative strategies depending on the support material used are summarized. From the reaction scope viewpoint, metal catalysts supported on the various solid materials studied in (asymmetric) transfer hydrogenation of carbonyl compounds are selected and represent the main focus of the second part of this overview.1 Introduction2 Synthesis of Chiral Heterogeneous Catalysts2.1 Immobilization of Homogeneous Asymmetric Catalysts2.1.1 Immobilization on Inorganic Supports2.1.2 Immobilization on Organic Polymers as Supports2.1.3 Immobilization on Dendrimer-Type Materials as Supports2.1.4 Self-Supported Chiral Catalysts: Coordination Polymers2.1.5 Immobilization Using Non-Conventional Media2.2 Chirally Modified Metal Surfaces for Heterogeneous Asymmetric Catalysis3 Examples of Transfer Hydrogenation on Heterogeneous Catalysts3.1 Silicon-Immobilized Catalysts3.2 Carbon-Material-Immobilized Catalysts3.3 Polymer-Immobilized Catalysts3.4 Magnetic-Nanoparticle-Immobilized Catalysts4 Conclusions

Asymmetric transfer hydrogenation of carbonyl compounds catalyzed by rhodium nanoparticles

2016 ◽  
Vol 420 ◽  
pp. 149-158 ◽  
Author(s):  
Lidiya O. Nindakova ◽  
Nataliya M. Badyrova ◽  
Vladimir V. Smirnov ◽  
Sergey S. Kolesnikov
Keyword(s):  
Carbonyl Compounds ◽  
Transfer Hydrogenation ◽  
Asymmetric Transfer Hydrogenation ◽  
Rhodium Nanoparticles

ChemInform Abstract: Asymmetric Transfer Hydrogenation of Ketones Catalyzed by Rhodium and Iridium Complexes with Chiral Bidentate Schiff′s Bases.

ChemInform ◽  
2010 ◽  
Vol 32 (50) ◽  
pp. no-no
Author(s):  
V. A. Pavlov ◽  
M. G. Vinogradov ◽  
E. V. Starodubtseva ◽  
G. V. Chel'tsova ◽  
V. A. Ferapontov ◽  
...  
Keyword(s):  
Transfer Hydrogenation ◽  
Iridium Complexes ◽  
Asymmetric Transfer Hydrogenation

Efficient asymmetric transfer hydrogenation of ketones in ethanol with chiral iridium complexes of spiroPAP ligands as catalysts

2015 ◽  
Vol 51 (28) ◽  
pp. 6123-6125 ◽  
Author(s):  
Wei-Peng Liu ◽  
Ming-Lei Yuan ◽  
Xiao-Hui Yang ◽  
Ke Li ◽  
Jian-Hua Xie ◽  
...  
Keyword(s):  
Hydrogen Donor ◽  
Transfer Hydrogenation ◽  
Chiral Alcohols ◽  
Iridium Complexes ◽  
Asymmetric Transfer Hydrogenation ◽  
Highly Efficient

Highly efficient iridium catalyzed asymmetric transfer hydrogenation of simple ketones with ethanol as a hydrogen donor has been developed, providing chiral alcohols with up to 98% ee.

N,O- vs N,C-Chelation in Half-Sandwich Iridium Complexes: A Dramatic Effect on Enantioselectivity in Asymmetric Transfer Hydrogenation of Ketones

ACS Catalysis ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 8020-8026 ◽  
Author(s):  
Gang Zhou ◽  
Ahmed H. Aboo ◽  
Craig M. Robertson ◽  
Ruixia Liu ◽  
Zhenhua Li ◽  
...  
Keyword(s):  
Transfer Hydrogenation ◽  
Iridium Complexes ◽  
Asymmetric Transfer Hydrogenation ◽  
Dramatic Effect ◽  
Half Sandwich
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