Synthesis, NMR Spectroscopy, and Molecular Modeling of
2-Methyl-2,3,4,5-tetrahydro-1H-[1]benzothieno[2,3-c]azepine
作者:A. B. Eresko、E. V. Raksha、Yu. V. Berestneva、A. V. Muratov、A. A. Voitash、V. S. Tolkunov、S. V. Tolkunov
DOI:10.1134/s1070428020110068
日期:2020.11
Abstract A new synthetic approach to fused azepines was demonstrated on an example of the synthesis of 2-methyl-2,3,4,5-tetrahydro-1H-[1]benzothieno[2,3-c]azepine. The key stage of the synthesis is the formation of the azepine ring under the Eschweiler–Clark reaction conditions. The Gibbs energy of activation for the inversion of the azepine ring was determined by dynamic 1H NMR spectroscopy. Molecular
摘要 在合成2-甲基-2,3,4,5-四氢-1 H- [1]苯并噻吩并[2,3- c ]氮杂example的一个实例上证明了一种新的融合a庚因的合成方法。合成的关键阶段是在Eschweiler-Clark反应条件下形成氮杂环丁烷环。通过动态1 H NMR光谱确定用于氮杂环庚烷环反转的吉布斯活化能。对2-甲基-2,3,4,5-四氢-1 H- [1]-苯并噻吩并[2,3- c ]进行结构的分子建模和1 H和13 C NMR化学位移的估计] a 使用B3LYP / 6-31G(d,p)优化的分子几何参数,通过标准GIAO方法计算出磁屏蔽张量。在PCM近似中考虑了溶剂效应。计算出的2-甲基-2,3,4,5-四氢-1 H- [1]-苯并噻吩并[2,3- c ] a庚因的1 H和13 C NMR化学位移与观察到的实验值非常吻合在其DMSO- d 6溶液的光谱中。