Cyclopalladation of the Indole Ring in Palladium(II) Complexes of 2N1O-Donor Ligands and Its Dependence on the O-Donor Properties
作者:Yuichi Shimazaki、Minoru Tashiro、Takeshi Motoyama、Satoshi Iwatsuki、Tatsuo Yajima、Yasuo Nakabayashi、Yoshinori Naruta、Osamu Yamauchi
DOI:10.1021/ic0504801
日期:2005.8.1
[Pd(iepc)Cl] (4) were prepared and revealed by X-ray analysis to have a pyridine nitrogen, an amine nitrogen, a phenolate or carboxylate oxygen, and a chloride ion in the coordination plane. UV absorption and 1H NMR spectral changes indicated that all the complexes could be converted to the indole-binding complexes where the O donor was replaced by the indole C2 atom by cyclopalladation in DMSO or DMF
已对新型2N1O供体配体的Pd(II)配合物进行了合成,结构,光谱和动力学研究,这些配体包含悬垂的吲哚3-(N-2-吡啶基甲基-N-2-羟基-5-甲氧基苄基氨基)乙基吲哚(HMeO-iepp),3-(N-2-吡啶基甲基-N-2-羟基-5-硝基苄氨基)乙基吲哚(HNO2-iepp)和(N-2-吡啶基甲基-3-吲哚基乙基氨基)乙酸(Hiepc) (H表示可解离的质子)。制备[Pd(MeO-iepp)Cl](2),[Pd(NO2-iepp)Cl](3)和[Pd(iepc)Cl](4),并通过X射线分析显示有吡啶配位平面中的氮,胺氮,酚或羧酸氧和氯离子。紫外吸收和1H NMR光谱变化表明,所有配合物均可转化为吲哚结合配合物,其中O供体在40-60℃的温度范围内在DMSO或DMF中通过环钯反应被吲哚C2原子取代。吲哚结合的复杂物种中的一部分服从一级动力学,由此估计活化参数。形成速率取决于O-给体基团