Palladium-Catalyzed Cross-Coupling of Pyrrole Anions with Aryl Chlorides, Bromides, and Iodides
作者:Ryan D. Rieth、Neal P. Mankad、Elisa Calimano、Joseph P. Sadighi
DOI:10.1021/ol048367m
日期:2004.10.1
enyl ligands, (pyrrolyl)zinc chloride may be cross-coupled with a wide range of aryl halides, including aryl chlorides and arylbromides, at low catalyst loadings and under mild conditions. A high degree of steric hindrance is tolerated. Certain ring-substituted pyrrole anions have also been arylated with arylbromide substrates.
We developed a facile photoinduced disproportionation approach to generate radical anions of pyrrole derivatives for the reduction of aryl halides, as well as the formation of desired heterocyclic product without the addition of any photocatalysts.
Palladium-catalysed direct arylations of NH-free pyrrole and N-tosylpyrrole with aryl bromides
作者:Charles Beromeo Bheeter、Jitendra K. Bera、Henri Doucet
DOI:10.1016/j.tetlet.2011.11.081
日期:2012.2
The palladium-catalyseddirectcoupling of aryl halides with pyrroles provides a greener access to arylated pyrroles than more classical couplings such as Suzuki, Stille or Negishi reactions. However, so far, NH-free pyrrole and N-tosylpyrrole gave disappointing results for such couplings either in terms of regioselectivity of the arylation, catalyst loading or substrate scope. The reactivity of both