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
Asymmetric Synthesis of Chiral Primary Amines by Ruthenium-Catalyzed Direct Reductive Amination of Alkyl Aryl Ketones with Ammonium Salts and Molecular H<sub>2</sub>
amination of simple ketones. The strategy makes use of ammonium acetate as the amine source and H2 as the reductant and is a user-friendly and operatively simple access to industrially relevant primary amines. Excellent enantiocontrol (>90% ee for most cases) was achieved with a wide range of alkylarylketones. The practicability of this methodology has been highlighted by scalable synthesis of key intermediates
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
enantiomerically pure 4-chloro(amino)pyridine derivatives has been synthesised through a chemoenzymatic approach, Candida antarctica lipase B (CAL-B) and Pseudomonascepacialipase (PSL) being found to be excellent biocatalysts for the preparation of new and interesting amines and amides in enantiomerically pure form through enzymatic aminolysis reactions. A study of the enzymatic reactivity of CAL-B and PSL
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