Primary Amines by Transfer Hydrogenative Reductive Amination of Ketones by Using Cyclometalated Ir<sup>III</sup>Catalysts
作者:Dinesh Talwar、Noemí Poyatos Salguero、Craig M. Robertson、Jianliang Xiao
DOI:10.1002/chem.201303541
日期:2014.1.3
Cyclometalated iridiumcomplexes are found to be versatile catalysts for the direct reductive amination (DRA) of carbonyls to give primary amines under transfer‐hydrogenation conditions with ammonium formate as both the nitrogen and hydrogen source. These complexes are easy to synthesise and their ligands can be easily tuned. The activity and chemoselectivity of the catalyst towards primary amines
Robust cyclometallated Ir(iii) catalysts for the homogeneous hydrogenation of N-heterocycles under mild conditions
作者:Jianjun Wu、Jonathan H. Barnard、Yi Zhang、Dinesh Talwar、Craig M. Robertson、Jianliang Xiao
DOI:10.1039/c3cc44567d
日期:——
Cyclometallated Cp*Ir(N∧C)Cl complexes derived from N-aryl ketimines are highly active catalysts for the reduction of N-heterocycles under ambient conditions and 1 atm H2 pressure. The reaction tolerates a broad range of other potentially reducible functionalities and does not require the use of specialised equipment, additives or purified solvent.
An oxidative kinetic resolution of racemic acyclic amines was developed using an imine derivative as the resolving reagent and chiral phosphoric acid as the catalyst to give enantiomers in good yields with high to excellent enantioselectivities. The key to success of the title reaction was the equilibrium control by adjusting the ratio of the resolving reagent, and unique enantiodivergence was observed
Hβ Catalyzed Condensation Reaction Between Aromatic Ketones and Anilines: To Access Ketimines (Imines)
作者:Vasu Amrutham、Naresh Mameda、Srujana Kodumuri、Durgaiah Chevella、Rammurthy Banothu、Krishna Sai Gajula、Nellya Gennadievna Grigor’eva、Narender Nama
DOI:10.1007/s10562-017-2196-0
日期:2017.12
A simple approach for the formation of imines by condensation of ketones and anilines over heterogeneous catalyst (Hβ zeolite) has been successfully developed. The present catalytic system scope was explored for various aromatic ketones and anilines. Furthermore, Hβ zeolite can be easily separable and recycled several times (five times) without considerable loss of its catalytic activity.Graphical
A new class of chiral Lewis bases for the enantioselective HSiCl3‐mediated reduction of imines was developed. Through extensive catalyst structure optimization, an extremely active species was identified that was able to promote the reduction of a large variety of functionalized substrates in high yields with enantioselectivities typically above 90 % with catalyst loadings as low as 0.1–1 mol %. The