A series of chiral bisphosphine ligands were designed and synthesized based on single-handed quinoline oligoamidefoldamers. The bisphosphine ligands can coordinate with Rh(cod)2BF4 in a 1 : 1 stoichiometry and the resulted chiral Rh(I) catalysts were applied in the asymmetric hydrogenation of α-dehydroamino acid esters, in which excellent conversions and promising levels of enantioselectivity were
A supramolecularly tunable chiral bisphosphine ligand bearing two pyridyl-containing crown ethers was synthesized and applied in Rh or Ir-catalyzed asymmetric hydrogenations in high yields with excellent ee values (90-99% ee).
Diaza-Crown Ether-Bridged Chiral Diphosphoramidite Ligands: Synthesis and Applications in Asymmetric Catalysis
作者:Yier Luo、Guanghui Ouyang、Yuping Tang、Yan-Mei He、Qing-Hua Fan
DOI:10.1021/acs.joc.0c00223
日期:2020.6.19
A small library of diaza-crown ether-bridged chiral diphosphoramidite ligands was prepared. In the rhodium-catalyzed asymmetric hydrogenation and hydroformylation reactions, these ligands exhibited distinct properties in catalytic activity and/or enantioselectivity. Hydrogenated products with opposite absolute configurations could be obtained in high yields with excellent ee values by utilizing (S
Asymmetric Reduction of Aromatic α-Dehydroamino Acid Esters with Water as Hydrogen Source
作者:Yuze Dai、Jingchao Chen、Zheting Wang、Ting Wang、Lin Wang、Yong Yang、Xingfang Qiao、Baomin Fan
DOI:10.1021/acs.joc.1c00426
日期:2021.5.21
The asymmetric reduction of aromatic α-dehydroamino acid esters with water as the hydrogensource was developed by a Rh/Cu co-catalytic system. The reaction tolerates various functional groups, providing a valuable synthetic tool to access chiral α-amino acid esters readily. Moreover, the present methodology also was applied in the cost-effective and easy to handle preparation of chiral deuterated