Transaminases Applied to the Synthesis of High Added-Value Enantiopure Amines
作者:Caroline E. Paul、María Rodríguez-Mata、Eduardo Busto、Iván Lavandera、Vicente Gotor-Fernández、Vicente Gotor、Susana García-Cerrada、Javier Mendiola、Óscar de Frutos、Iván Collado
DOI:10.1021/op4003104
日期:2014.6.20
stereoselective amination of (hetero)aromatic ketones using transaminases have been studied, such as temperature, pH, substrate concentration, cosolvent, and source and percentage of amino donor, to further optimize the production of enantiopure amines using both (S)- and (R)-selective biocatalysts from commercial suppliers. Interesting enantiopure amino buildingblocks have been obtained, overcoming some limitations
Metallacrown Ether Catalysts Containing Phosphine-Phosphite Polyether Ligands for Rh-Catalyzed Asymmetric Hydrogenation - Enhancements in Activity and Enantioselectivity
作者:Feng-Tao Song、Guang-Hui Ouyang、Yong Li、Yan-Mei He、Qing-Hua Fan
DOI:10.1002/ejoc.201402735
日期:2014.10
of tunable metallacrown ether rhodium catalysts based on α,ω-(phosphine–phosphite) polyether ligands were prepared either by a template-induced method or by a nontemplate procedure. For the asymmetrichydrogenation of α-arylenamides with the addition of K+ cations, the ortho-diphenylphosphine-substituted metallacrown ether catalyst showed high enantioselectivities (up to 99 % ee), which are comparable
Enantioselective Synthesis of (<i>R</i>)-2-Arylpropanenitriles Catalysed by Ene-Reductases in Aqueous Media and in Biphasic Ionic Liquid-Water Systems
作者:Elisabetta Brenna、Michele Crotti、Francesco G. Gatti、Alessia Manfredi、Daniela Monti、Fabio Parmeggiani、Sara Santangelo、Davila Zampieri
DOI:10.1002/cctc.201402205
日期:2014.8
The enantioselective reduction of α‐methylene nitrile derivatives catalysed by ene‐reductases affords the corresponding (R)‐2‐arylpropanenitriles with high conversion values. The reaction is investigated either in aqueous medium (with an organic cosolvent or by loading the substrate onto hydrophobic resins) or in a biphasicionicliquid–watersystem. The use of ionic liquids, herein with isolated ene‐reductases
A Novel Class of P−O Monophosphite Ligands Derived from <scp>d</scp>-Mannitol: Broad Applications in Highly Enantioselective Rh-Catalyzed Hydrogenations
on a new class of P−O monophosphite ligands (designated 3a−k) with a double six-membered-ring backbone onto which are attached additional groups and on applications of their Rh complexes in the hydrogenation of enamides, α-dehydroamino acid esters, dimethyl itaconate, and β-(acylamino)acrylates. Our results demonstrate that the Rh complexes with ligands 3a−k exhibit high enantioselectivity and reactivity
New chiral ferrocene/indole-based diphosphine ligands for Rh-catalyzed asymmetric hydrogenation of functionalized olefins
作者:Zaheer Abbas、Xin-Hu Hu、Aijaz Ali、You-Wei Xu、Xiang-Ping Hu
DOI:10.1016/j.tetlet.2020.151860
日期:2020.5
Convenient synthesis of a new family of chiral ferrocene/indole-based diphosphine ligands, (Rc,Rp)-IndoFerroPhos (L), from (Sc,Rp)-PPFA and 2-(diphenylphosphino)indole has been described. These newligands exhibited high efficiency in the Rh-catalyzed asymmetric hydrogenation of functionalized olefins including α-dehydroamino acid esters, α-enamides and dimethyl itaconate, in which up to >99% yield