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.
Rhodium-catalyzed direct coupling of biaryl pyridine derivatives with internal alkynes
作者:Jun Zheng、Shu-Li You
DOI:10.1039/c4cc02822h
日期:——
Axially chiral biaryls were synthesized by an isoquinoline or 2-pyridine-directed Rh(iii)-catalyzed dual C–H cleavage and coupling with internal alkynes.
Rh(III)-Catalyzed Atroposelective C–H Iodination of 1-Aryl Isoquinolines
作者:Dong-Song Zheng、Wen-Wen Zhang、Qing Gu、Shu-Li You
DOI:10.1021/acscatal.3c00751
日期:——
rhodium-catalyzed enantioselectiveC–Hiodination of 1-aryl isoquinolines under mild conditions is disclosed. DirectC–Hiodination of 1-aryl isoquinolines with N-iodosuccinimide (NIS) catalyzed by chiral CpRh(III) complexes afforded a series of axiallychiralbiaryl iodides in excellent yields and enantioselectivity (up to 99% yield and 97% ee). Furthermore, the atroposelectiveC–H bromination and chlorination