Seven new 3-alkyl(aryl)-4-(2-thienymethylenamino)-4,5-dihydro-1H-1,2,4-triazol-5-ones(2)were synthesized by the reactions of 3-alkyl(aryl)-4-amino-4,5-dihydro-1H-1,2,4-triazol-5-ones(1)with thiophene-2-carbaldehyde. In addition,N-acetyl derivatives of compounds2d-2gwere also prepared. The structures of eleven new compounds synthesized were determined by elemental analysis as well as IR, NMR and UV spectral data. In addition, compounds2a-gand3a,3b,3d-fwere also screened for their antioxidant activities and2a-gwere potentiometrically titrated with tetrabutylammonium hydroxide (TBAH) in four nonaqueous solvents (isopropyl alcohol,t-butyl alcohol, acetonitrile andN,N-dimethyl formamide). Also half-neutralization potential values and the corresponding pKa values were determined in all cases.
通过3-烷基(芳基)-4-氨基-4,5-二氢-1H-1,2,4-三唑-5-酮(1)与噻吩-2-甲醛的反应,合成了七种新的3-烷基(芳基)-4-(2-噻吩甲亚胺基)-4,5-二氢-1H-1,2,4-三唑-5-酮(2)。此外,还制备了化合物2d-2g的N-乙酰基衍生物。通过元素分析以及IR、NMR和UV光谱数据确定了合成的十一种新化合物的结构。此外,化合物2a-g和3a、3b、3d-f还被筛选出其抗氧化活性,并在四种非水溶剂(异丙醇、t-丁醇、乙腈和N,N-二甲基甲酰胺)中以四丁基氢氧化铵(TBAH)为滴定剂进行电位滴定。在所有情况下,半中和电位值和相应的pKa值也被确定。