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