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.
A General and Highly Selective Cobalt-Catalyzed Hydrogenation of N-Heteroarenes under Mild Reaction Conditions
作者:Rosa Adam、Jose R. Cabrero-Antonino、Anke Spannenberg、Kathrin Junge、Ralf Jackstell、Matthias Beller
DOI:10.1002/anie.201612290
日期:2017.3.13
Herein, a general and efficientmethod for the homogeneous cobalt‐catalyzed hydrogenation of N‐heterocycles, under mild reaction conditions, is reported. Key to success is the use of the tetradentate ligand tris(2‐(diphenylphosphino)phenyl)phosphine). This non‐noble metal catalyst system allows the selectivehydrogenation of heteroarenes in the presence of a broad range of other sensitive reducible
Highly Enantioselective Direct Synthesis of Endocyclic Vicinal Diamines through Chiral Ru(diamine)-Catalyzed Hydrogenation of 2,2′-Bisquinoline Derivatives
作者:Wenpeng Ma、Jianwei Zhang、Cong Xu、Fei Chen、Yan-Mei He、Qing-Hua Fan
DOI:10.1002/anie.201608181
日期:2016.10.4
An asymmetrichydrogenation of 2,2′‐bisquinoline and bisquinoxaline derivatives, catalyzed by chiral cationic ruthenium diamine complexes, was developed. A broad range of chiral endocyclic vicinal diamines were obtained in high yields with excellent diastereo‐ and enantioselectivity (up to 93:7 dl/meso and >99 % ee). These chiral diamines could be easily transformed into a new class of chiral N‐heterocyclic