1,2,5-Oxadiazole N-Oxide Derivatives and Related Compounds as Potential Antitrypanosomal Drugs: Structure−Activity Relationships
摘要:
The syntheses of a new series of derivatives of 1,2,5-oxadiazole N-oxide, benzo[1,2-c]1,2,5-oxadiazole N-oxide, and quinoxaline di-hr-oxide are described. In vitro antitrypanosomal activity of these compounds was tested against epimastigote forms of Trypanosoma cruzi. For the most effective drugs, derivatives IIIe and IIIf, the 50% inhibitory dose (ID50) was determined as well as their cytotoxicity against mammalian fibroblasts. Electrochemical studies and ESR spectroscopy show that the highest activities observed are associated with the facile mono-electronation of the N-oxide moiety. Lipophilic-hydrophilic balance of the compounds could also play an important role in their effectiveness as antichagasic drugs.
As part of an ongoing program on the chemistry and biological activity of N-oxide-containing molecules, a number of novel 1,2, 5-oxadiazole N-oxide, benzo[1,2-c]1,2,5-oxadiazole N-oxide, and quinoxaline N,N'-dioxide derivatives were synthesized and evaluated for their herbicidal activity. Many of these compounds exhibited moderate to good herbicidal pre-emergence activity against Triticum aestivum
作为正在进行的有关含氮氧化物分子化学和生物学活性的计划的一部分,许多新型的1,2,5-恶二唑N-氧化物,苯并[1,2-c] 1,2,5-恶二唑合成了N-氧化物和喹喔啉N,N'-二氧化物衍生物,并对其除草活性进行了评估。这些化合物中有许多对普通小麦表现出中等至良好的除草前出苗活性。在更具代表性的化合物(12、20和26)上进行了剂量反应研究。活性最强的丁基氨基甲酰基苯并[1,2-c] 1,2,5-恶二唑N-氧化物26在低至24 g / ha的浓度下表现出除草活性。