Convenient methods for the preparation of stable, fused selenazolinium salt systems with a Se–N+ bond have been developed. The mechanism for the formation of the selenazole cycle was investigated in detail by conducting multinuclear NMR experiments. The ability of these compounds to form stable inner salts was demonstrated. We have shown the glutathione peroxidase (GPx) like properties of selenazolopyridinium
已经开发了用于制备稳定的、具有 Se-N+ 键的稠合硒唑啉盐体系的便捷方法。通过进行多核核磁共振实验,详细研究了硒唑循环的形成机制。证明了这些化合物形成稳定内盐的能力。我们已经通过氧化含硫的天然氨基酸以及芳香醛和杂芳香醛,展示了硒唑并吡啶鎓盐的类似谷胱甘肽过氧化物酶 (GPx) 的特性。大多数化合物的分子结构已通过 X 射线衍射研究证实。
Unusual Regioselectivity in the Aldehyde Addition Reactions of Allenyl/Propargyl Zirconium Complexes Derived from γ-(2-Pyridyl)propargyl Ethers: Synthesis of Multisubstituted α-Hydroxyallenes
作者:Guoqin Fan、Xin Xie、Yuanhong Liu、Yuxue Li
DOI:10.1021/om301007z
日期:2013.3.25
different to that of the reactions using propargylic ethers without a pyridyl group reported so far, in which homopropargyl alcohols were formed predominantly. The structure of allenylzirconium intermediate has been confirmed by X-ray crystal analysis which reveals an intramolecular Zr–N coordination. DFT calculations suggest that the smaller steric effect of the pyridine ring compared with the phenyl