A New Class of Tunable Dendritic Diphosphine Ligands: Synthesis and Applications in the Ru-Catalyzed Asymmetric Hydrogenation of Functionalized Ketones
作者:Baode Ma、Tingting Miao、Yihua Sun、Yanmei He、Ji Liu、Yu Feng、Hui Chen、Qing-Hua Fan
DOI:10.1002/chem.201402709
日期:2014.8.4
dendritic 2,2′‐bis(diphenylphosphino)‐1,1′‐binaphthyl (BINAP) ligands was prepared by attaching polyaryl ether dendrons onto the four phenyl rings on the P atoms. Their ruthenium complexes were employed in the asymmetric hydrogenation of β‐ketoesters, α‐ketoesters, and α‐ketoamides to reveal the effects of dendron size on the catalytic properties. The second‐ and third‐generation catalysts exhibited excellent
Ir-catalyzed asymmetric hydrogenation of β-keto esters with chiral ferrocenyl P,N,N-ligands
作者:Xiu-Shuai Chen、Chuan-Jin Hou、Chao Qin、Hongzhu Liu、Yan-Jun Liu、De-Zhi Huang、Xiang-Ping Hu
DOI:10.1039/c7ra00472a
日期:——
The Ir-catalyzed asymmetrichydrogenation of β-keto esters with chiralferrocenylP,N,N-ligands has been developed. Under the optimized conditions, a wide range of β-keto esters were hydrogenated to afford the corresponding β-hydroxy esters in good to excellent enantioselectivities (up to 95% ee).
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.