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。
Manganese(I)-Catalyzed Transfer Hydrogenation and Acceptorless Dehydrogenative Condensation: Promotional Influence of the Uncoordinated N-Heterocycle
作者:Chong Zhang、Bowen Hu、Dafa Chen、Haiping Xia
DOI:10.1021/acs.organomet.9b00475
日期:2019.8.26
showed the highest activity. The reactions proceeded well with 0.5 mol % of catalyst loading and 20 mol % of t-BuOK at 85 °C for 24 h. Furthermore, 3 was also used as a catalyst for the synthesis of primary alcohols via transfer hydrogenation of aldehydes and the synthesis of 1,2-disubstituted benzimidazoles and quinolines via acceptorless dehydrogenative condensations.
四种二齿锰(I)配合物[(C 5 H 4 N-C 5 H 3 N-OH)Mn(CO)3 Br](1),[(C 9 H 6 N-C 5 H 3 N-OH)Mn(CO )3 Br](2),[(C 8 H 5 N 2 -C 5 H 3 N-OH)Mn(CO)3 Br](3)和[(C 8 H 5 N 2 -C 5 H 3 N-OCH 3)Mn(CO)3Br](4)被合成。测试了这些配合物作为酮转移氢化的催化剂,其中3种显示出最高的活性。在85℃下,在0.5mol%的催化剂负载量和20mol%的t- BuOK下,反应进行得很好,持续了24小时。此外,3还用作催化剂,用于通过醛的转移氢化合成伯醇,以及通过无受体的脱氢缩合反应合成1,2-二取代的苯并咪唑和喹啉。
Ruthenium-catalysed oxidative cyclisation of 2-aminobenzyl alcohol with ketones: modified Friedlaender quinoline synthesis
作者:Chan Sik Cho、Bok Tae Kim、Tae-Jeong Kim、Sang Chul Shim
DOI:10.1039/b109245f
日期:2001.12.19
2-Aminobenzyl alcohol is oxidatively cyclised with an array of ketones in dioxane at 80 °C in the presence of a catalytic amount of a ruthenium catalyst and KOH to afford the corresponding quinolines in high yields.
A recyclable palladium-catalyzed modified Friedländer quinoline synthesis
作者:Chan Sik Cho、Wen Xiu Ren
DOI:10.1016/j.jorganchem.2007.06.022
日期:2007.9
2-Aminobenzyl alcohol reacts with an array of ketones in toluene/poly(ethylene glycol) (PEG-2000) at 100 °C in the presence of a palladium catalyst along with KOH under an atmosphere of air to give the corresponding quinolines in good yields. The catalytic system could be recovered and reused five times without any loss of catalytic activity.
A copper(II)-catalyzed protocol for modified Friedländer quinoline synthesis
作者:Chan Sik Cho、Wen Xiu Ren、Sang Chul Shim
DOI:10.1016/j.tetlet.2006.07.067
日期:2006.9
2-Aminobenzylalcohol reacts with an array of ketones in dioxane at 100 °C in the presence of a catalytic amount of CuCl2 along with KOH under O2 atmosphere to afford the corresponding quinolines in good yields. 2-Aminobenzylalcohol is also oxidatively coupled and cyclized with various aldehydes by step-by-step procedure, an initial treatment of 2-aminobenzylalcohol in the presence of CuCl2 and KOH
Synthesis of 2-Substituted Quinolines from 2-Aminostyryl Ketones Using Iodide as a Catalyst
作者:So Young Lee、Jiye Jeon、Cheol-Hong Cheon
DOI:10.1021/acs.joc.8b00552
日期:2018.5.4
A new protocol for the synthesis of 2-substituted quinolinesfrom 2-aminostyryl ketones has been developed using iodide as a nucleophilic catalyst. Conjugate addition of iodide to 2-aminostyryl ketones yielded the corresponding β-iodoketones, which could have a conformation where the amino and carbonyl groups are proximal through free rotation about the Cα–Cβ single bond. Subsequent condensation between