Impregnated palladium on magnetite as catalyst for direct arylation of heterocycles
作者:Rafael Cano、Juana M. Pérez、Diego J. Ramón、Gerard P. McGlacken
DOI:10.1016/j.tet.2015.12.039
日期:2016.2
magnetite is an efficient, cheap and easy to prepare catalyst for the direct arylation of heterocycles. Good yields are afforded under relatively mild conditions and a broad substrate scope is evident. The catalyst is regioselective in many cases, affording arylated products, at the C2- or C3-position (depending of the heterocycle used). The methodology can be extended to prepare chromenes through an intramolecular
浸渍在磁铁矿上的钯是一种有效,便宜且易于制备的用于杂环直接芳基化的催化剂。在相对温和的条件下可获得良好的收率,并且明显的底物范围是明显的。在许多情况下,催化剂对区域具有选择性,在C2或C3位置提供芳基化产物(取决于所用的杂环)。该方法可以扩展以通过分子内直接芳基化反应制备二甲基苯。为两种催化剂失活途径提供了一些证据,这阻碍了有效的再循环。