Multicomponent and one-pot synthesis of trisubstituted pyridines through a Pd-catalyzed cross-coupling/cross-coupling/cycloaddition sequence
作者:José Barluenga、Agustín Jiménez-Aquino、M. Alejandro Fernández、Fernando Aznar、Carlos Valdés
DOI:10.1016/j.tet.2007.10.112
日期:2008.1
Trisubstituted pyridines are regioselectively synthesized through multicomponent and one-pot processes promoted by a bifunctional Pd-catalyst. The process involves formation of an enamine by Pd-catalyzed amination of an alkenyl bromide, formation of a 2-aza-1,3-butadiene by Pd-catalyzed cross-coupling of a trimethylsilylimine with an alkenyl bromide, and Lewis acid catalyzed cycloaddition between the
三取代吡啶是通过双功能Pd催化剂促进的多组分和一锅法区域选择性合成的。该方法包括通过钯催化的烯基溴化物的胺化形成烯胺,通过钯催化的三甲基甲硅酰亚胺与烯基溴化物的交叉偶联形成2-氮杂-1,3-丁二烯,以及路易斯酸催化的之间的环加成反应。烯胺和氮杂二烯。