Palladium-catalyzed synthesis of polysubstituted quinolines from 2-amino aromatic ketones and alkynes
作者:Wang Zhou、Jianhua Lei
DOI:10.1039/c4cc00939h
日期:——
A palladium-catalyzed one-pot method for the synthesis of quinolines from commercial or readily available 2-amino aromatic ketones and alkynes is reported for the first time. This transformation offers an alternative method for the synthesis of polysubstituted quinoline.
Rh(III)-Catalyzed Traceless Coupling of Quinoline <i>N</i>-Oxides with Internal Diarylalkynes
作者:Upendra Sharma、Yoonsu Park、Sukbok Chang
DOI:10.1021/jo501995c
日期:2014.10.17
Quinoline N-oxides were found to undergo Cp*Rh(III)-catalyzed coupling with internal diarylalkynes to provide 8-functionalized quinolines through a cascade process that involves remoteC–H bond activation, alkyne insertion, and intramolecular oxygen atom transfer. In this reaction, the N-oxide plays a dual role, acting as a tracelessdirectinggroup as well as a source of oxygen atom, as confirmed
successful in the presence of a palladiumcatalyst without the support of a copper co-catalyst. Significantly, the method enabled the use of the commercially available and cheap lithium acetylide ethylenediamine complex as a source of acetylene for the construction of dual CC bonds, with a wide range of compatibility towards various substituents of the arylbromides/iodides. Significantly, this protocol
Weak Directing Group Steered Formal Oxidative [2+2+2]-Cyclization for Selective Benzannulation of Indoles
作者:Kiran R. Bettadapur、Raja Kapanaiah、Veeranjaneyulu Lanke、Kandikere Ramaiah Prabhu
DOI:10.1021/acs.joc.7b02719
日期:2018.2.16
A double C–H activation and double insertion process to achieve the synthesis benzo[e]indole frameworks has been disclosed. This type of benzannulation is directed by a trifluoromethylketone moiety, which is easy to install on the indole C3-position. Overall the reaction takes places as an oxidative cyclization of two alkynes with the C4–C5 position of indole.
Direct Synthesis of Symmetric Diarylethynes from Calcium Carbide and Arylboronic Acids/Esters
作者:Rugang Fu、Zheng Li
DOI:10.1002/ejoc.201701234
日期:2017.12.8
A new methodology for the direct synthesis of symmetric diarylethynes from the reactions of calcium carbide with arylboronic acids/esters is described. Various symmetric diarylethynes were generated from the corresponding arylboronic acids/esters in satisfactory yield by using a palladium catalyst. The advantages of this protocol include the use of a readily available and easy-to-handle acetylene source