作者:Colin T. Carver、Diego Benitez、Kevin L. Miller、Bryan N. Williams、Ekaterina Tkatchouk、William A. Goddard、Paula L. Diaconescu
DOI:10.1021/ja902794w
日期:2009.7.29
Group III alkyl complexessupported by a ferrocenediamideligand (1,1'-fc(NSi(t)BuMe(2))(2)) have been found to be reactive toward aromatic N-heterocycles such as 1-methylimidazole and pyridines. These reactions were investigated experimentally and computationally. An initial C-H activation event is followed by a coupling reaction to form biheterocyclic complexes, in which one of the rings is dearomatized
已发现由二茂铁二酰胺配体 (1,1'-fc(NSi(t)BuMe(2))(2)) 支持的第 III 组烷基配合物对芳香族 N-杂环(如 1-甲基咪唑和吡啶)具有反应性。通过实验和计算研究了这些反应。最初的 CH 活化事件之后是偶联反应以形成双杂环复合物,其中一个环被脱芳构化。在1-甲基咪唑的情况下,双杂环化合物不能被分离并进一步导致咪唑开环产物;在吡啶的情况下,它转化为具有双键扩展共轭的异构体。根据实验和计算结果提出了两种反应的机理。
Dearomatization Reactions of N-Heterocycles Mediated by Group 3 Complexes
作者:Kevin L. Miller、Bryan N. Williams、Diego Benitez、Colin T. Carver、Kevin R. Ogilby、Ekaterina Tkatchouk、William A. Goddard、Paula L. Diaconescu
DOI:10.1021/ja908489p
日期:2010.1.13
ligand are reactive toward aromatic N-heterocycles by mediating their coupling and, in a few cases, the cleavage of their C-N bonds. When these complexes reacted with 2,2'-bipyridine or isoquinoline, they facilitated the alkyl migration of the benzyl ligand onto the pyridine ring, a process accompanied by the dearomatization of the N-heterocycle. The products of the alkyl-transfer reactions act as hydrogen
Group 3 Metal Complexes of Radical-Anionic 2,2′-Bipyridyl Ligands
作者:Bryan N. Williams、Wenliang Huang、Kevin L. Miller、Paula L. Diaconescu
DOI:10.1021/ic101493k
日期:2010.12.20
A new method for generating group3 metal complexes containing radical-anionic 2,2′-bipyridyl (bipy) ligands is described that relies on hydrogen-atom abstraction from dearomatized biheterocyclic complexes. This method does not involve electron transfer to neutral 2,2′-bipyridyl or salt metathesis between the lithium salt of the 2,2′-bipyridyl radical anion and group3 metal halides. The new metal