Hyperconjugation effect on diene reactivity in 1-methyltetrazolo[5,1-a]isoindole-derived amides and thioamides
作者:Tatyana V. Yegorova、Svitlana V. Shishkina、Roman I. Zubatyuk、Magdalina D. Tsapko、Oleg V. Shishkin、Zoia V. Voitenko
DOI:10.1016/j.tet.2019.02.025
日期:2019.3
Optimized synthesis of 1-methyltetrazolo[5,1-a]isoindole-derived amides and thioamides was elaborated. Based on 13C NMR spectroscopy and X-Ray diffraction studies data, it was proposed that zwitterionic resonance structures contributed significantly to the structure of these compounds. Geometry optimization was performed in vacuo using m06-2x/cc-pvtz method taking into account polarizing effect of
阐述了1-甲基四唑并[5,1- a ]异吲哚衍生的酰胺和硫代酰胺的最佳合成方法。基于13 C NMR光谱和X射线衍射研究数据,提出两性离子共振结构对这些化合物的结构起了重要作用。考虑到环境的偏振效应(PCM模型)和特定的分子间相互作用,使用m06-2x / cc-pvtz方法在真空中进行几何优化。使用NBO方法分析这些分子中的电子密度分布。使用Δ(HOMO二烯-LUMO亲双烯体在酰胺和硫代酰胺)真空并在质子溶剂中评估了Diels–Alder反应的可能性。在真空,非质子传递和质子传递溶剂中估算了酰胺衍生物的π-π共轭和n→σ*超共轭的能量。