Asymmetric Hydrogenation of Cyclic Imines of Benzoazepines and Benzodiazepines with Chiral, Cationic Ruthenium-Diamine Catalysts
作者:Zhusheng Yang、Ziyuan Ding、Fei Chen、Yan-Mei He、Nianfa Yang、Qing-Hua Fan
DOI:10.1002/ejoc.201700236
日期:2017.4.10
The title hydrogenation reaction is achieved in the presence of phosphine‐free, chiral, cationic ruthenium–diamine complexes and provides facile access to various chiral seven‐membered N‐containing heterocycles. A reversal of enantioselectivity is observed simply by changing the achiral counteranion of the catalyst.
Direct and Enantioselective Synthesis of N−H-Free 1,5-Benzodiazepin-2-ones by an N-Heterocyclic Carbene Catalyzed [3+4] Annulation Reaction
作者:Chao Fang、Jing Cao、Kewen Sun、Jindong Zhu、Tao Lu、Ding Du
DOI:10.1002/chem.201705050
日期:2018.2.9
An NHC‐catalyzed formal [3+4] annulation of α,β‐unsaturated acylazoliums with protecting‐group‐free aryl 1,2‐diamines was developed for a direct and highly enantioselectivesynthesis of 4‐aryl N−H‐free 1,5‐benzodiazepin‐2‐ones. This methodology offers an efficient and rapid access to a wide range of enantioenriched target compounds from easily accessible starting materials. The protocol is also scalable
First Highly Enantioselective Synthesis of Benzodiazepinones by Catalytic Hydrogenation
作者:Magnus Rueping、Estíbaliz Merino、René M. Koenigs
DOI:10.1002/adsc.201000547
日期:2010.10.4
The firstcatalyticenantioselectivesynthesis of benzodiazepinones employing an efficient hydrogenation protocol has been developed. The corresponding products are obtained in good yields, with excellent enantioselectivities and broad functional group tolerance. In addition, a one-pot procedure involving in situ generation of benzodiazepin-2-ones followed by asymmetric reduction is presented.
Enantioselective synthesis of 4-substituted 4,5-dihydro-1H-[1,5]benzodiazepin-2(3H)-ones has been accomplished through chiral Lewis base-catalyzed hydrosilylation. The corresponding products were obtained in excellent yields (up to 99%) and enantioselectivities (up to 98%). The absolute configuration of product 3n has been determined as S by X-ray crystallographic analysis.