Practical asymmetric hydrogenation of β-keto esters at atmospheric pressure using chiral Ru (II) catalysts
作者:J.P. Genêt、V. Ratovelomanana-Vidal、M.C. Caño de Andrade、X. Pfister、P. Guerreiro、J.Y. Lenoir
DOI:10.1016/0040-4039(95)00873-b
日期:1995.7
conditions of asymmetrichydrogenation of β-keto esters with chiralRu(II) catalysts are described. It is now possible to carry out the reaction at atmospheric pressure. Under these conditions, β-keto esters are hydrogenated to β-hydroxy esters with excellent enantiomeric excesses (up to 99%) using chiral ruthenium (II) catalysts easily prepared in situ by treatment of commercially available (COD)Ru(2-methylallyl)2
The present invention relates to a process for preparing mono-N-sulphonylated diamines by reacting diamines with sulphonyl halides in the presence of water, base and organic solvents.
Iridium-catalyzed asymmetric hydrogenation of <font>β</font>-keto esters with f-amphox ligands
作者:Chao Qin、Xiu-Shuai Chen、Chuan-Jin Hou、Hongzhu Liu、Yan-Jun Liu、De-Zhi Huang、Xiang-Ping Hu
DOI:10.1080/00397911.2017.1414267
日期:2018.3.19
ABSTRACT The iridium-catalyzed asymmetric hydrogenation of β-keto esters with chiral tridentate P,N,N-ligands (f-amphox) has been developed. Under the optimized conditions, a wide range of β-keto esters can be hydrogenated smoothly, affording the corresponding β-hydroxy esters in good to excellent enantioselectivities (up to 95% ee). GRAPHICAL ABSTRACT
Iridium-catalyzed asymmetric hydrogenation of <i>β</i>-keto esters with new phenethylamine-derived tridentate P,N,N-ligands
作者:De-Quan Wei、Xiu-Shuai Chen、Chuan-Jin Hou、Xiang-Ping Hu
DOI:10.1080/00397911.2018.1550203
日期:2019.1.17
Abstract A new class of phenethylamine-derived tridentate P,N,N-ligands has been successfully developed. These ligands exhibited good performance in the Ir-catalyzedasymmetric hydrogenation of β-keto esters, affording the corresponding β-hydroxy esters in moderate to good enantioselectivities. GRAPHICAL ABSTRACT
摘要 成功开发了一类新的苯乙胺衍生的三齿P,N,N-配体。这些配体在 Ir 催化的 β-酮酯不对称氢化中表现出良好的性能,以中等至良好的对映选择性提供相应的 β-羟基酯。图形概要
An Improved Asymmetric Reformatsky Reaction Mediated by (−)-<i>N</i>,<i>N</i>-Dimethylaminoisoborneol
作者:Ralf J. Kloetzing、Tobias Thaler、Paul Knochel
DOI:10.1021/ol0531381
日期:2006.3.1
(-)-N,N-Dimethylaminoisoborneol ((-)-DAIB) was found to be an excellent ligand for the enantioselective addition of Reformatsky reagents to aromatic and aliphatic aldehydes. Enantioselectivities up to 93% ee were obtained with sulfur-containing aldehydes.