Amination of Ketones by Employing Two New (S)-Selective ω-Transaminases and the His-Tagged ω-TA from Vibrio fluvialis
作者:Francesco G. Mutti、Christine S. Fuchs、Desiree Pressnitz、Nikolaus G. Turrini、Johann H. Sattler、Alexandra Lerchner、Arne Skerra、Wolfgang Kroutil
DOI:10.1002/ejoc.201101476
日期:2012.2
Two recently identified (S)-selective ω-transaminases (ω-TAs) that originate from Paracoccus denitrificans (Strep-PD-ωTA, cloned with an N-terminal Strep-tag II) and Pseudomonas fluorescens (PF-ωTA) were employed for the asymmetric amination of selected prochiral ketones. The substrates tested were transformed into opticallypureamines (>99 % ee) with high conversion (up to >99 %). The ω-TAs led to
两种最近鉴定的 (S) 选择性 ω-转氨酶 (ω-TA) 源自反硝化副球菌(Strep-PD-ωTA,用 N 端 Strep-tag II 克隆)和荧光假单胞菌(PF-ωTA)用于选定的前手性酮的不对称胺化。测试的底物以高转化率(高达 >99%)转化为光学纯胺(>99%ee)。在没有二甲亚砜作为共溶剂的情况下,ω-TA 导致转化率高于其存在 (15%, v/v)。此外,研究表明,来自河流弧菌的带有 His 标签的重组转氨酶(His-VF-ωTA,用 N 端 His6 标签克隆)显示,对于单一底物乙酰乙酸乙酯,与相应的商业酶制剂(> 99 与 50 %)。
Enzymatic Racemization of Amines Catalyzed by Enantiocomplementary ω-Transaminases
作者:Dominik Koszelewski、Barbara Grischek、Silvia M. Glueck、Wolfgang Kroutil、Kurt Faber
DOI:10.1002/chem.201001602
日期:2011.1.3
A strategy for the biocatalytic racemization of primary α‐chiral amines was developed by employing a pair of stereocomplementary PLP‐dependent ω‐transaminases. The interconversion of amine enantiomers proceeded through reversible transamination by a prochiral ketone intermediate, either catalyzed by a pair of stereocomplementary ω‐transaminases or by a single enzyme possessing low stereoselectivity
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
Stereoselectivity of Four (R)-Selective Transaminases for the Asymmetric Amination of Ketones
作者:Francesco G. Mutti、Christine S. Fuchs、Desiree Pressnitz、Johann H. Sattler、Wolfgang Kroutil
DOI:10.1002/adsc.201100558
日期:2011.11
Four (R)-ω-transaminases originating from Hyphomonas neptunium (HN-ωTA), Aspergillus terreus (AT-ωTA) and Arthrobacter sp. (ArR-ωTA), as well as an evolved transaminase (ArRmut11-ωTA) were successfully employed for the amination of prochiral ketones leading to optically pure (R)-amines. The first three transaminases displayed perfect stereoselectivity for the amination of all substrates tested (ee
Decarboxylative Ritter-Type Amination by Cooperative Iodine (I/III)─Boron Lewis Acid Catalysis
作者:Rok Narobe、Kathiravan Murugesan、Simon Schmid、Burkhard König
DOI:10.1021/acscatal.1c05077
日期:2022.1.7
intermediates also on electronically disfavored benzylic positions. The unusually high reactivity of the system stems from a complexation of iodine (III) intermediates with BF3. The synthetic utility of our decarboxylative Ritter-type amination protocol has been demonstrated by the functionalization of benzylic as well as aliphatic carboxylic acids, including late-stage modification of different pharmaceutical