Application of Phosphine−Oxazoline Ligands in Ir-Catalyzed Asymmetric Hydrogenation of Acyclic Aromatic <i>N</i>-Arylimines
作者:Anna Trifonova、Jarle S. Diesen、Christopher J. Chapman、Pher G. Andersson
DOI:10.1021/ol048399+
日期:2004.10.1
[reaction: see text] A new class of chiral phosphine-oxazoline ligands have been developed. Chiral Ir complexes prepared from these ligands induced high enantioselectivities (66-90% ee) when applied to the asymmetrichydrogenation of acyclic aromatic N-arylimines.
Hydrogenation and Transfer Hydrogenation Promoted by Tethered Ru−S Complexes: From Cooperative Dihydrogen Activation to Hydride Abstraction/Proton Release from Dihydrogen Surrogates
well as with a representative Hantzsch ester dihydrogen surrogate, are reported. Both processes are catalyzed by tethered Ru−S complexes but differ in the activation mode of the dihydrogen source: cooperative activation of the H−H bond at the Ru−S bond leads to the corresponding Ru−H complex and protonation of the sulfur atom, whereas the same cationic Ru−S catalyst abstracts a hydride from a donor‐substituted
Unsupported nanoporous gold catalyst for highly selective hydroamination of alkynes
作者:Ye Lu、Ying Wang、He Li、Peihe Li、Xiujuan Feng、Yoshinori Yamamoto、Ming Bao、Jinghai Liu
DOI:10.1039/d2ra07120g
日期:——
An efficient and highly selective heterogeneous catalyst system for hydroamination of alkynes was developed using unsupported gold nanopores (AuNPore) for the first time. The AuNPore-catalyzed highly regioselective hydroamination of alkynes proceeded smoothly without any additive and solvent under mild conditions (rt-50 °C) to yield Markovnikov imines in satisfactory to excellent yields. No gold leached