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 Lewis acid 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
ZnCl 2,Sc(OTf)3 或BF 3 OEt 2均可促进钯催化的甲基吡啶和相关杂环的芳基化(参见示例)。路易斯酸与杂环中氮原子的络合有助于还原消除,从而以高收率产生各种芳基化吡啶。BF 3 ⋅OEt 2还发现,以促进2,4-二甲基吡啶的情况下,高度选择性metalations。