Enantioselective Metal-Free Hydrogenations of Disubstituted Quinolines
作者:Zhenhua Zhang、Haifeng Du
DOI:10.1021/acs.orglett.5b03307
日期:2015.12.18
A metal-freehydrogenation of 2,4-disubstituted quinolines was realized for the first time using chiral diene derived borane catalysts to furnish the corresponding tetrahydroquinolines in 75–98% yields with 95/5−99/1 dr’s and 86–98% ee’s. This catalytic system was also effective for 2,3-disubstituted quinolines to give moderate to good ee’s.
The reaction goes equally well when 2-nitrobenzyl methyl ether was used instead of 2-nitrobenzyl alcoholunder otherwise identical conditions, shedding a new light on the study of this quinoline synthetic method. An iron-catalyzed redox condensation of 2-nitrobenzyl alcohols, formic acid, and alcohols has been developed, which affords substituted quinolines with carbon dioxide and water as the only side
Phosphine Ligand‐Free Ruthenium Complexes as Efficient Catalysts for the Synthesis of Quinolines and Pyridines by Acceptorless Dehydrogenative Coupling Reactions
作者:Bin Guo、Tian‐Qi Yu、Hong‐Xi Li、Shi‐Qi Zhang、Pierre Braunstein、David J. Young、Hai‐Yan Li、Jian‐Ping Lang
DOI:10.1002/cctc.201900435
日期:2019.5.20
corresponding ligand in EtOH. Five Ru(II) complexes [LRu(DMSO‐κS)Cl2] (2 a: L=L1; 2 b: L=L2; 2 c: L=L3; 2 d: L=L4; 2bMe: L=L2Me) were formed by reducing the corresponding Ru(III) complex in refluxing EtOH. The latter complexes could also be prepared directly by refluxing Ru(DMSO)4Cl2 with the corresponding ligand in EtOH. These Ru(III) and Ru(II) complexes, especially 1 b/2 b, exhibited high catalytic
Preparation of 2-arylquinolines from β-arylpropionitriles with aryllithiums and NIS through iminyl radical-mediated cyclization
作者:Hiroki Naruto、Hideo Togo
DOI:10.1039/c9ob00944b
日期:——
Treatment of β-arylpropionitriles with aryllithiums, followed by the reaction with water and then with NIS under irradiation with a tungsten lamp gave 2-arylquinolines in good to moderate yields. The present reaction proceeds through the formation of N-iodoimines from imines with NIS, the generation of imino-nitrogen-centered radicals, and their cyclization onto the aromatic rings of the imines to
Synthesis of Quinolines from Allylic Alcohols via Iridium-Catalyzed Tandem Isomerization/Cyclization Combined with Potassium Hydroxide
作者:Chun Cai、Shu-jie Chen、Guo-ping Lu
DOI:10.1055/s-0034-1380110
日期:——
reaction following a tandemprocess integrating isomerization of allylic alcohols and oxidative cyclization of 2-aminobenzyl alcohol. A new tandem catalytic process has been established for the synthesis of quinolines. This process utilizes the [IrCp*Cl2]2/KOH catalyzed isomerization/cyclization of allylic alcohols with 2-aminobenzyl alcohol. Both the secondary and primary allylic alcohols were investigated