C4 and C7 positions in coumarin backbone has been proposed as a potential modification site for providing excellent bioactivity according to previous studies. A series of novelcoumarin derivatives were rationally designed and synthesized by use of a complex catalytic system for a targeted modification at the above sites. These derivatives were assayed for nematicidal activity. As predicted, the derivatization
摘要根据先前的研究,香豆素骨架中C4和C7位的羟基存在被认为是潜在的修饰位点,可提供出色的生物活性。通过使用复杂的催化系统在上述位点进行靶向修饰,合理设计和合成了一系列新型香豆素衍生物。测定这些衍生物的杀线虫活性。如所预期的,衍生化增强了香豆素对抗五个线虫的活性。化合物7b,9a,10c和11c对所有测试的线虫均表现出明显的强杀线虫广谱活性。化合物10c最有效,其LC 50值最低的是对南方根结线虫(5.1μmol/ L),Ditylenchus破坏物(3.7μmol/ L),粘液囊(Bursaphelenchus mucronatus)(6.4μmol/ L)和Bursaphelenchus B. 分别为木糖(2.5μmol/ L)和苯丙酸苯丙胺(3.1μmol/ L)。对结构-活性关系(SAR)的简要研究表明,与C4羟基相比,C7羟基的靶向修饰效果最佳,并且偶联链长对于杀线虫活性至关重要。