A series of novel 3-phenoxy-4-(3-trifluoromethylphenyl)pyridazines 2–5 were designed, based on the structure of our previous lead compound 1 through the in silico structure-guided optimization approach. The results showed that some of these new compounds showed a good herbicidal activity at the rate of 750 g ai/ha by both pre- and post-emergence applications, especially compound 2a, which displayed a comparable pre-emergence herbicidal activity to diflufenican at 300–750 g ai/ha, and a higher post-emergence herbicidal activity than diflufenican at the rates of 300–750 g ai/ha. Additionally, 2a was safe to wheat by both pre- and post-emergence applications at 300 g ai/ha, showing the compound’s potential for weed control in wheat fields. Our molecular simulation studies revealed the important factors involved in the interaction between 2a and Synechococcus PDS. This work provided a lead compound for weed control in wheat fields.
一系列新型3-苯氧基-4-(3-三氟甲基苯基)吡啶并嗪2-5,通过基于我们先前的引物化合物1的结构,采用in silico结构引导的优化方法设计而成。结果表明,其中一些新化合物在750 g ai/ha的前后出苗应用下表现出良好的除草活性,尤其是化合物2a,在300-750 g ai/ha的前出苗除草活性与300-750 g ai/ha的地菜草灵相当,而后出苗除草活性高于地菜草灵。此外,2a在300 g ai/ha的前后出苗应用下对小麦安全,显示了该化合物在小麦田除草的潜力。我们的分子模拟研究揭示了2a与Synechococcus PDS相互作用的重要因素。这项工作为小麦田的除草提供了一个引物化合物。