Hydrazone as the Directing Group for Ir-Catalyzed Arene Diborylations and Sequential Functionalizations
作者:Abel Ros、Rocío López-Rodríguez、Beatriz Estepa、Eleuterio Álvarez、Rosario Fernández、José M. Lassaletta
DOI:10.1021/ja300308c
日期:2012.3.14
The use of hemilabile pyridine-hydrazone N,N-ligands allows the highlyselective Ir-catalyzed ortho,ortho'-directed diborylation of aromatic N,N-dimethylhydrazones in near-quantitative yields. One-pot sequential Suzuki-Miyaura cross-coupling with different arylbromides provides a short entry to unsymmetrically substituted 2,6-diarylbenzaldehyde derivatives.
使用 hemilabile 吡啶-腙 N,N-配体允许以接近定量的产率对芳香族 N,N-二甲基腙进行高度选择性的 Ir 催化的邻、邻'-定向二硼化。与不同芳基溴化物的一锅顺序 Suzuki-Miyaura 交叉偶联为不对称取代的 2,6-二芳基苯甲醛衍生物提供了一个捷径。
Additionen von Organometallverbindungen an die C?N-Bindung
作者:A. Marxer、M. Horvath
DOI:10.1002/hlca.19640470421
日期:——
The addition of organometallic compounds to SCHIFF bases, hydrazones, and oximes was studied. It is shown that, contrary to statements in the literature, hydra-zones and oximes may give rise to the same type of C-alkylation and C-arylation as already known for SCHIFF bases.
The synthesis of N-alkyl-1H-1,2,4-triazoles from N,N-dialkylhydrazones and nitriles via formal [3+2] cycloaddition including the C-chlorination/nucleophilic addition/cyclisation/dealkylation sequence was developed. This sequential reaction utilising the in situ generation of hydrazonoyl chloride based on the ambiphilic reactivity of hydrazones afforded a variety of multi-substituted N-alkyl-triazoles
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.
reductive monoalkyl- ation of amines and amine derivatives with aldehydes is reported. Treatment of aldehydes with primary amines, secondaryamines, O- trimethylsilylhydroxylamine, and N,N-dimethylhydrazine in lithi- um perchlorate/diethylether and trimethylsilyl chloride, followed by BH3·NEt3 reduction, and straightforward workup afforded sec- ondary amines, tertiary amines, N-substituted hydroxylamines