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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Comprehensive DFT and MP2 Level Investigations of Reaction of 2,3-Dihydro-1,5-benzodiazepine-2-thiones with Hydrazine
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Comprehensive DFT and MP2 Level Investigations of Reaction of 2,3-Dihydro-1,5-benzodiazepine-2-thiones with Hydrazine

机译:2,3-二氢-1,5-苯并二氮杂-2-硫酮与肼反应的综合DFT和MP2水平研究

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摘要

Density functional theory approach was used for the 4-phenyl-2,3-dihydro-1,5-benzodiazepine-2-thione compound to determine the mechanism of hydrazinolysis of 4-substituted 2,3-dihydro-1,5-benzodiazepine- 2-thiones. Single-point calculations at the MP2/6-311+G(d,p)//B3LYP/6-311+G(d,p) level were performed for the more accurate energy prediction. The solvent effect was taken into account by carrying out singlepoint calculations using the PCM methodology. The obtained results show that in the investigating mechanism the first step consists of the hydrazine molecule addition to the thiocarbonyl bond of the 4-phenyl-2,3-dihydro- 1,5-benzodiazepine-2-thione following removal of H2S. Further addition of another hydrazine molecule to the azomethyne bond and cyclization with pyrazole ring formation occur, and then the diazepine ring-opening and the removal of hydrazine molecule proceed. Finally, imine-enamine tautomerization leads to 5-N-(2- aminophenyl-1-amino)-3-phenylpyrazole as a main product that is in agreement with the experimental observation. The cyclization step is a rate-determining step of this reaction.
机译:对4-苯基-2,3-二氢-1,5-苯并二氮杂-2-硫酮化合物使用密度泛函理论方法确定4-取代的2,3-二氢-1,5-苯并二氮杂萘-的肼解机理。 2-硫酮。为了更准确地预测能量,在MP2 / 6-311 + G(d,p)// B3LYP / 6-311 + G(d,p)级别上执行了单点计算。通过使用PCM方法进行单点计算来考虑溶剂效应。获得的结果表明,在研究机理中,第一步是在除去H2S之后,将肼分子加到4-苯基-2,3-二氢-1,5-苯并二氮杂-2-硫酮的硫代羰基键上。进一步将另一肼分子添加至偶氮甲炔键并形成具有吡唑环的环化,然后进行二氮杂环开环和肼分子的去除。最后,亚胺-烯胺互变异构导致5-N-(2-氨基苯基-1-氨基)-3-苯基吡唑为主要产物,与实验观察结果一致。环化步骤是该反应的速率确定步骤。

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