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
Direct arylations of electron-deficient (hetero)arenes with aryl or alkenyl tosylates and mesylates
作者:Lutz Ackermann、Sabine Fenner
DOI:10.1039/c0cc02360d
日期:——
A palladium catalyst derived from the ligand X-Phos enabled generally applicable directarylations of electron-deficient heteroarenes and arenes with aryl and alkenyl tosylates or mesylates.