Lewis Acid Promoted Benzylic Cross-Couplings of Pyridines with Aryl Bromides
作者:Stéphanie Duez、Andreas K. Steib、Sophia M. Manolikakes、Paul Knochel
DOI:10.1002/anie.201103074
日期:2011.8.8
Either ZnCl2, Sc(OTf)3 , or BF3⋅OEt2 can promote the palladium‐catalyzed arylation of methylpyridines and related heterocycles (see example). The complexation of the Lewisacid to the nitrogen atom in the heterocycle facilitates the reductive elimination, leading to various arylated pyridines in high yields. BF3⋅OEt2 was also found to promote highly regioselective metalations in the case of 2,4‐lutidine