Synthesis of Unsymmetrically Substituted Bipyridines by Palladium-Catalyzed Direct C−H Arylation of Pyridine <i>N</i>-Oxides
作者:Sasa Duric、C. Christoph Tzschucke
DOI:10.1021/ol200565u
日期:2011.5.6
Substituted bipyridines were efficiently prepared by direct coupling between pyridine N-oxides and halopyridines using a palladium catalyst. Pyridine N-oxides with electron-withdrawing substitutents gave the best yields. This method allows the convenient preparation of 2,2′-, 2,3′-, and 2,4′-bipyridines which are useful as functionalized ligands for metal complexes or as building blocks for supramolecular
通过使用钯催化剂在吡啶的N-氧化物和卤代吡啶之间直接偶联,可以有效地制备取代的联吡啶。带有吸电子取代基的吡啶N-氧化物的收率最高。该方法允许方便地制备2,2'-,2,3'-和2,4'-联吡啶,其可用作金属配合物的官能化配体或用作超分子结构的结构单元。