Synthesis and RP HPLC studies of biologically active semicarbazides and their cyclic analogues 1,2,4-triazol-3-ones
摘要:
The retention behaviour of semicarbazides and their cyclic analogues 1,2,4-triazol-3-ones, has been investigated by RP-8, RP-18 and IAM HPLC. The structures of new derivatives were proved by elemental analyses, IR, H-1 NMR and C-13 NMR spectroscopy. The compounds showed regular retention behaviour in three chromatographic systems; their log k values decreased linearly with the increasing concentration of an organic modifier in the mobile phase. The ratio of the intercept (log k (w)) to the slope of compounds is constant and the same for both groups of compounds on C18 and IAM stationary phases. Differences between log k (w) values from the octadecyl stationary phase of corresponding cyclic and linear derivatives are constant, and they are related to the mechanism of synthesis of 1,2,4-triazol-3-ones from linear substrate semicarbazides, which was confirmed by modelling studies. Good correlations between log k (w) parameters obtained by RP-8 or RP-18 and determined by the computational approach log P were found.
在这项研究中,通过1-(环戊二烯的环化反应合成了一些3-(噻吩-2-基甲基)-4-取代的-4,5-二氢-1 H -1,2,4-三唑-5衍生物。噻吩-2-基乙酰基)-4-取代的氨基脲衍生物在碱性介质中或噻吩-2-基乙酸酰肼与异氰酸酯的直接反应中。所有新化合物的结构均通过分析和光谱法确认。在体外针对几种需氧细菌评估了选定的衍生物。其中一些对化脓性链球菌,铜绿假单胞菌和金黄色葡萄球菌具有活性。