On the possibility for synthesizing dihydrotriazolothiadiazoles by condensation of 4-amino-2,4-dihydro-3H-1,2,4-triazole-3-thiones with aromatic aldehydes
作者:A. Ya. Bespalov、T. L. Gorchakova、A. Yu. Ivanov、M. A. Kuznetsov、L. M. Kuznetsova、A. S. Pankova、L. I. Prokopenko、A. F. Khlebnikov
DOI:10.1134/s1070428016030210
日期:2016.3
Regardless of the conditions, the condensation of 4-amino-2,4-dihydro-3H-1,2,4-triazole-3-thiones with aromatic aldehydes afforded the corresponding hydrazones as the only product. Both initial amines and resulting hydrazones exist as the thione rather than thiol tautomer. In no case bicyclic 5,6-dihydro[1,2,4]triazolo[3,4-b][1,3,4]thiadiazoles that are isomeric to the hydrazones were detected. DFT
无论条件如何,4-氨基-2,4-二氢-3 H -1,2,4-三唑-3-硫酮与芳族醛的缩合得到相应的为唯一产物。初始胺和生成的均以硫酮而不是硫醇互变异构体的形式存在。在任何情况下均未检测到与酮异构体的双环5,6-二氢[1,2,4]三唑并[3,4- b ] [1,3,4]噻二唑。B3LYP / 6-31 + g(d,p的DFT量子化学计算))具有完整几何优化的理论水平表明,甲醇和DMF中的structure结构比双环异构体稳定19-23 kcal / mol,这完全排除了这种环化的可能性。的硫酮互变异构体比硫醇结构稳定11-13 kcal / mol。