Synthesis, Acidity and Antioxidant Properties of Some Novel 3,4-disubstituted-4,5-dihydro-1H-1,2,4-triazol-5-one Derivatives
作者:Muzaffer Alkan、Haydar Yüksek、Özlem Gürsoy-Kol、Mustafa Calapoğlu
DOI:10.3390/molecules13010107
日期:——
3-Alkyl(aryl)-4-amino-4,5-dihydro-1H-1,2,4-triazol-5-ones 2a-g reacted with4-diethylaminobenzaldehyde to afford the corresponding 3-alkyl(aryl)-4-(4-diethylaminobenzylidenamino)-4,5-dihydro-1H-1,2,4-triazol-5-ones 3a-g. The acetylationreactions of compounds 3a-e were investigated and compounds 4a-e were thus obtained.The new compounds were characterized using IR, 1H-NMR, 13C-NMR, UV and MSspectral data. In addition, the newly synthesized compounds 3a-g were titratedpotentiometrically with tetrabutylammonium hydroxide in four non-aqueous solvents suchas isopropyl alcohol, tert-butyl alcohol, acetone and N,N-dimethylformamide (DMF), andthe half-neutralization potential values and the corresponding pKa values were determinedfor all cases. Moreover, 3 and 4 type compounds were also screened for their antioxidantactivities.
3-烷基(芳基)-4-
氨基-4,5-二氢-
1H-1,2,4-三唑-5-酮2a-g与4-二乙
氨基
苯甲醛反应得到相应的3-烷基(芳基)-4- (4-二乙
氨基亚苄基
氨基)-4,5-二氢-
1H-1,2,4-三唑-5-酮3a-g。研究了化合物3a-e的乙酰化反应,得到了化合物4a-e。利用IR、1H-NMR、13C-NMR、UV和MS光谱数据对新化合物进行了表征。此外,在
异丙醇、
叔丁醇、
丙酮和
N,N-二甲基甲酰胺(
DMF)四种非
水溶剂中,用
四丁基氢氧化铵对新合成的化合物3a-g进行电位滴定,得到半中和电位值和相应的半中和电位值。确定所有情况的 pKa 值。此外,还筛选了3型和4型化合物的抗氧化活性。