En Route to (S)-Selective Chemoenzymatic Dynamic Kinetic Resolution of Aliphatic Amines. One-Pot KR/Racemization/KR Sequence Leading to (S)-Amides
摘要:
A one-pot sequential process, involving a radical racemization and an enzymatic resolution, provides access to (S)-amides, from racemic amines, with ee and yields ranging from 78 to 94% and 58 to 80%, respectively.
DOI:
10.1021/jo900074w
作为产物:
描述:
6-甲基-2-庚酮 在
leucine amine dehydrogenase from Geobacillus stearothermophilus leucine dehydrogenase D32A,F101S,C290V, A112G and L39A mutant 、 还原型辅酶Ⅰ 作用下,
生成 (2R)-6-甲基-2-庚胺
The asymmetric reductive amination of ketones with ammonia using engineered amine dehydrogenases (AmDHs) is a particularly attractive and environmentally friendly method for the synthesis of chiral amines. However, one major challenge for these engineered AmDHs is their limited range of accepted substrates. Herein, several engineered AmDHs were developed through the evolution of naturally occurring
Ruthenium Catalyzed Direct Asymmetric Reductive Amination of Simple Aliphatic Ketones Using Ammonium Iodide and Hydrogen
作者:Tamal Ghosh、Martin Ernst、A. Stephen K. Hashmi、Thomas Schaub
DOI:10.1002/ejoc.202000750
日期:2020.8.16
On the direct asymmetric reductive amination of aliphatic ketones to primary amines: By using Ru‐Binaphane as catalyst and NH4I as the amine source, it is possible to aminate prochiral aliphatic ketones with moderate ee values up to 74 %.
N-Acyl glycinates as acyl donors in serine protease-catalyzed kinetic resolution of amines. Improvement of selectivity and reaction rate
作者:Malek Nechab、Lahssen El Blidi、Nicolas Vanthuyne、Stéphane Gastaldi、Michèle P. Bertrand、Gérard Gil
DOI:10.1039/b812089g
日期:——
Enzymatic kineticresolution of aliphatic and benzylic aminesleading to (S)-amides was achieved by using alkaline protease as the catalyst and N-octanoyl glycine trifluoroethylester as the acyldonor; enantioselectivity ranged between 4 to 244, while reaction times were dramatically shortened and ranged between 15 min to 6 h.
N-Octanoyldimethylglycine Trifluoroethyl Ester, an Acyl Donor Leading to Highly Enantioselective Protease-Catalysed Kinetic Resolution of Amines
作者:Severine Queyroy、Nicolas Vanthuyne、Stéphane Gastaldi、Michèle P. Bertrand、Gérard Gil
DOI:10.1002/adsc.201100993
日期:2012.6.18
The use of N‐octanoyldimethylglycine trifluoroethylester as acyldonor in the kineticresolution of aliphatic amines catalysed by proteases led to enantiomeric ratios >200 in most cases. The resolutions mediated by Protex 6L were shown to be much faster than the resolutions achieved with the most efficient commercially available serine proteases, i.e., alkaline protease, Properase 1600L, and Subtilisin
Asymmetric Catalysis of the Carbonyl-Amine Condensation: Kinetic Resolution of Primary Amines
作者:Sayantani Das、Nilanjana Majumdar、Chandra Kanta De、Dipti Sankar Kundu、Arno Döhring、Anika Garczynski、Benjamin List
DOI:10.1021/jacs.6b12176
日期:2017.2.1
Brønsted acid catalyzed kinetic resolution of primary amines is described that is based on the condensation between an amine and a carbonyl compound. 1,3-Diketones react with racemic α-branched amines to furnish the corresponding enantioenriched enaminone and recovered starting material. Good to excellent enantioselectivity was observed with both aromatic and aliphatic primary amines. This process