Highly Enantioselective Hydrogenation of Quinolines Using Phosphine-Free Chiral Cationic Ruthenium Catalysts: Scope, Mechanism, and Origin of Enantioselectivity
作者:Tianli Wang、Lian-Gang Zhuo、Zhiwei Li、Fei Chen、Ziyuan Ding、Yanmei He、Qing-Hua Fan、Junfeng Xiang、Zhi-Xiang Yu、Albert S. C. Chan
DOI:10.1021/ja2023042
日期:2011.6.29
Asymmetrichydrogenation of quinolines catalyzed by chiralcationic η(6)-arene-N-tosylethylenediamine-Ru(II) complexes have been investigated. A wide range of quinoline derivatives, including 2-alkylquinolines, 2-arylquinolines, and 2-functionalized and 2,3-disubstituted quinoline derivatives, were efficiently hydrogenated to give 1,2,3,4-tetrahydroquinolines with up to >99% ee and full conversions
Asymmetric Pnictogen-Bonding Catalysis: Transfer Hydrogenation by a Chiral Antimony(V) Cation/Anion Pair
作者:Jian Zhang、Jun Wei、Wei-Yi Ding、Shaoyu Li、Shao-Hua Xiang、Bin Tan
DOI:10.1021/jacs.1c02808
日期:2021.5.5
Pnictogen-bonding catalysisbased on σ-hole interactions has recently attracted the attention of synthetic chemists. As a proof-of-concept for asymmetric pnictogen-bonding catalysis, we report herein an enantioselective transfer hydrogenation of benzoxazines catalyzed by a novel chiral antimony cation/anion pair. The chiral pnictogen catalyst library could be rapidly accessed from triarylstibine with
Enantiodivergent Synthesis of Chiral Tetrahydroquinoline Derivatives via Ir-Catalyzed Asymmetric Hydrogenation: Solvent-Dependent Enantioselective Control and Mechanistic Investigations
Ir-catalyzed asymmetrichydrogenation of quinolines was developed, and both enantiomers of chiral tetrahydroquinoline derivatives could be easily obtained, respectively, in high yields with good enantioselectivities through the adjustment of reaction solvents (toluene/dioxane: up to 99% yield, 98% ee (R), TON = 680; EtOH: up to 99% yield, 94% ee (S), TON = 1680). It provided an efficient and simple
开发了 Ir 催化的喹啉不对称氢化反应,通过调节反应溶剂(甲苯/二恶烷:产率高达 99%,98% ee),可以分别以高产率和良好的对映选择性轻松获得手性四氢喹啉衍生物的两种对映异构体( R ),TON = 680;EtOH:高达 99% 的产率,94% ee ( S ),TON = 1680)。它为手性四氢喹啉的对映发散合成提供了一种有效且简单的合成策略,并且在这两个反应体系中,克级不对称加氢反应在低催化剂负载的情况下顺利进行。一系列氘标记实验、对照实验和1进行了H NMR和电喷雾电离-质谱实验,并在这些有用观察的基础上揭示了合理和可能的反应过程。
A convergent rhodium-catalysed asymmetric synthesis of tetrahydroquinolines
作者:Ho Yin Li、Joachim Horn、Amanda Campbell、David House、Adam Nelson、Stephen P. Marsden
DOI:10.1039/c4cc04940c
日期:——
Rh-catalysed conjugate additions of 2-aminophenyl boronic acid derivatives were exploited in diastereoselective and asymmetric syntheses of tetrahydroquinolines.
Cooperative Organocatalysis: A Systematic Investigation of Covalently Linked Organophosphoric Acids for the Stereoselective Transfer Hydrogenation of Quinolines
A series of covalently linked bis‐ and trisphosphoric acids was investigated for their application in the stereoselective transfer‐hydrogenation of quinolines. In a combined experimental and theoretical study, it was found that the number and relative positioning of the chiral 1,1′‐binaphthyl‐phosphoric acid groups strongly influences the stereoselectivity of the reaction, based on two competing reaction