Ytterbium-catalyzed formal [4+2] cycloaddition: Synthesis of chalcogen-quinolines 3-unsubstituted
作者:Isadora M. de Oliveira、Mariana P. Darbem、C. Henrique A. Esteves、Daniel C. Pimenta、Julio Zukerman-Schpector、Hélio A. Stefani、Flávia Manarin
DOI:10.1016/j.tetlet.2018.09.022
日期:2018.10
A regioselective ytterbium-catalyzed annulation reaction between ethylglyoxalate, anilines and silyl-alkynes bearing selenyl- and telluryl-moieties for the formation of poly-substituted quinolones is described. A series of examples formed under mild conditions are presented, including a scaled-up reaction and a study on catalyst recyclability.
Ytterbium(<scp>iii</scp>)-catalyzed three-component reactions: synthesis of 4-organoselenium-quinolines
作者:Isadora M. de Oliveira、Stanley S. N. Vasconcelos、Cristiane S. Barbeiro、Thiago C. Correra、Anwar Shamim、Daniel C. Pimenta、Ignez Caracelli、Julio Zukerman-Schpector、Hélio A. Stefani、Flávia Manarin
DOI:10.1039/c7nj01803g
日期:——
4-Organoselenium-quinolines were synthesized via model multi-component Povarov (MCR) reactions between p-anisidine, ethyl glyoxylate and ethynyl(phenyl)selane, catalyzed by the Lewis acid Yb(OTf)3, with yields ranging from moderate to good. This method is advantageous in that there is no requirement for an oxidant and that the reaction has a wide scope. These 4-organoselenium-quinolines allowed access