The cationic ruthenium-hydride complex catalyzes the dehydrative C-H coupling reaction of arylamines with 1,2-diols to form the indole products. The analogous coupling of arylamines with 1,3-diols afforded the substituted, quinolines. The catalytic method directly forms these coupling products in a highly regioselective manner without generating any toxic byprodficts.
An efficient method for the direct synthesis of substituted quinolines from anilines and aldehydes through C–H functionalization, C–C/C–N bond formation, and C–C bond cleavage has been developed. The method is simple and practical and employs air as an oxidant.
Metal-Free, Ionic Liquid-Mediated Synthesis of Functionalized Quinolines
作者:Jaideep B. Bharate、Sandip B. Bharate、Ram A. Vishwakarma
DOI:10.1021/co500047w
日期:2014.11.10
An expedient and metal-free synthetic protocol for construction of substituted quinolines has been developed from anilines and phenylacetaldehydes using imidazolium cation-based ionic liquids as the reaction medium. Mechanistic analysis indicated that the reaction occurs through C-C and C-N bond formation to produce isolable 2,3-disubstituted quinoline intermediates, which undergo C-C bond cleavage to produce 3-substituted quinolines. The reaction proceeds smoothly with a range of functionalities in good to excellent yields. Advantages of this protocol include metal-free, environmentally friendly, recyclable reaction media, higher yields and shorter reaction times, and thus is promising for the efficient combinatorial synthesis of structurally diverse 2,3-disubstituted and 3-substituted quinolines.
Iron-Promoted Tandem Reaction of Anilines with Styrene Oxides via C–C Cleavage for the Synthesis of Quinolines
作者:Yicheng Zhang、Min Wang、Pinhua Li、Lei Wang
DOI:10.1021/ol300391t
日期:2012.5.4
A novel iron-promoted tandem reaction of anilines with styrene oxides via C-C cleavage and C-H activation has been developed. The reaction utilizes an inexpensive FeCl3 as promoter and is suitable for forming a variety of 3-aryiquinolines from the simple and readily available starting materials.
Catalytic Synthesis of Substituted Indoles and Quinolines from the Dehydrative C–H Coupling of Arylamines with 1,2- and 1,3-Diols
作者:Hanbin Lee、Chae S. Yi
DOI:10.1021/acs.organomet.6b00273
日期:2016.6.13
The cationic ruthenium-hydride complex catalyzes the dehydrative C-H coupling reaction of arylamines with 1,2-diols to form the indole products. The analogous coupling of arylamines with 1,3-diols afforded the substituted, quinolines. The catalytic method directly forms these coupling products in a highly regioselective manner without generating any toxic byprodficts.
Rh-Catalyzed Direct Amination of Unactivated C(sp<sup>3</sup>
)−H bond with Anthranils Under Mild Conditions
C−N Bond formation is of great significance due to the ubiquity of nitrogen‐containing compounds. Here, a mild and efficient RhIII‐catalyzed C(sp3)−H aryl amination reaction is reported. Anthranil is employed as the nitrogen source with 100 % atom efficiency. This C−H amination reaction exhibits broad substrate scope without using any external oxidants. Mechanistic studies including rhodacycle intermediates