Use of Hemilabile N,N Ligands in Nitrogen-Directed Iridium-Catalyzed Borylations of Arenes
作者:Abel Ros、Beatriz Estepa、Rocío López-Rodríguez、Eleuterio Álvarez、Rosario Fernández、José M. Lassaletta
DOI:10.1002/anie.201104544
日期:2011.12.2
The hemilabile character of 2‐pyridyl carbaldehyde hydrazones as N,N bidentate ligands is key to performing regioselective IrIII‐catalyzed ortho borylations of 2‐aryl pyridines(isoquinolines) and aromatic N,N‐dimethylhydrazones (see scheme; pin=pinacol, Bn=benzyl). Internal “ate” complexes or products free from NB interactions are formed depending on the steric properties of the substrates.
作为N,N二齿配体的2-吡啶基甲醛甲醛的半不稳定特性是进行2-芳基吡啶(异喹啉)和芳族N,N-二甲基hydr的区域选择性Ir III催化邻硼烷基化的关键(参见方案; pin = pinacol,Bn =苄基)。内部的“吃”复合物或产品选自N释放乙相互作用取决于基板的立体性质而形成。