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
Base-mediated synthesis of quinolines: an unexpected cyclization reaction between 2-aminobenzylalcohol and ketones
作者:Hans Vander Mierde、Pascal Van Der Voort、Francis Verpoort
DOI:10.1016/j.tetlet.2008.09.103
日期:2008.11
Quinolines are prepared in an oxidative cyclizationreaction between 2-aminobenzylalcohol and ketones. This reaction, that involves a hydrogen transfer, is mediated solely by a base without the need for a transition metal catalyst.
Improved ruthenium catalysts for the modified Friedlaender quinoline synthesis
作者:Hans Vander Mierde、Nele Ledoux、Bart Allaert、Pascal Van Der Voort、Renata Drozdzak、Dirk De Vos、Francis Verpoort
DOI:10.1039/b707292a
日期:——
Herein we describe an improved ruthenium catalyst for the oxidative cyclization of 2-aminobenzylalcohol with ketones, leading to quinolines via a modified Friedlaender synthesis.
A Ruthenium-Catalyzed Approach to the Friedländer Quinoline Synthesis
作者:Hans Vander Mierde、Pascal Van Der Voort、Dirk De Vos、Francis Verpoort
DOI:10.1002/ejoc.200701001
日期:2008.3
In a modification of the Friedlander reaction, 2-aminobenzylalcohol is oxidativelycyclized with a variety of ketones to yield substituted quinolines. Of all the ruthenium catalysts that were tested for this reaction, the second-generation Grubbs' catalyst gives the highest quinoline yield, in combination with KOtBu as a base. The presence of a hydrogen acceptor is required to regenerate the catalyst