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
Nanomole-Scale Assignment of Configuration for Primary Amines Using a Kinetic Resolution Strategy
作者:Shawn M. Miller、Renzo A. Samame、Scott D. Rychnovsky
DOI:10.1021/ja310620c
日期:2012.12.19
The absolute configurations of primary amines were assigned using a kinetic resolution strategy with Mioskowski's enantioselective 1-(R,R) and 2-(S,S) acylating agents. A simple mnemonic was developed to determine the configuration. A pseudoenantiomeric pair of reagents, 1-(R,R) and 2-(S,S)-d(3), was prepared and used to assay primary amines on a micromolar scale. The ESI-MS readout of the resulting
A class of pyrazole derivatives is described for use in treating p38 kinase medicated disorders. Compounds of particular interest are defined by Formula IA
wherein R
1
, R
2
, R
3
and R
4
are as described in the specification.
Rh-Catalyzed Enantioselective Hydrogenation of Di- and Tri-Substituted Enamides Enabled by Easily Tunable P-Stereogenic <i>N</i>-Phosphinyl Phosphoramidite Ligands
作者:Soumyadeep Chakrabortty、Katharina Konieczny、Jan-Ole Moritz、Shasha Zheng、Sergey Tin、Bernd H. Müller、Johannes G. de Vries
DOI:10.1021/acscatal.3c03336
日期:2023.9.15
with a broad functional group tolerance up to >99% ee. Other challenging trisubstituted vinylic olefins were also reduced with excellent enantioselection. A range of trisubstituted carbocyclic olefins bearing different functional groups were also reduced delivering products with >99% ee’s. Pharmaceutically important chiral primary amines have also been prepared using the hydrogenation/hydrolysis method
合成了模块化混合供体P-立体窄咬角N-氧膦基亚磷酰胺配体库( JoSoPhos )。JoSoPhos配体库被应用于抗帕金森治疗药物雷沙吉兰的不对称合成,通过 Rh 催化的 1-茚满酮衍生的烯酰胺的不对称氢化作为关键步骤,其 ee 大于 99%,收率 79% 。Rh/ JoSoPhos该催化剂还在乙烯基烯酰胺的不对称氢化中表现出高催化性能,具有高达 >99% ee 的广泛官能团耐受性。其他具有挑战性的三取代乙烯基烯烃也因优异的对映体选择而减少。一系列带有不同官能团的三取代碳环烯烃也被还原,得到 ee 大于 99% 的产品。药学上重要的手性伯胺也已使用氢化/水解方法以接近对映体纯的形式制备。同位素标记研究表明,Rh/ JoSoPhos催化的二取代和三取代烯酰胺的对映选择性氢化是一种无异构化的直接不对称氢化过程。