Abstract
设计合成了一系列2-甲基-6-硝基苯磺酰脲衍生物(4a~4p), 通过核磁共振氢谱(1H NMR)和高分辨质谱(HRMS)对其结构进行了确认. 盆栽法除草测试结果表明, 在300 g/ha剂量下, 目标化合物具有优异的芽前或芽后除草活性. 进一步筛选发现, 在75 g/ha剂量下, 化合物4b, 4g, 4h, 4l和4p对油菜、反枝苋和稗草具有98%以上的除草活性, 与对照药单嘧磺隆(100%)和氯磺隆(≥96.3%)相当. 另外, 部分化合物对真菌也表现出一定的抑制效果, 其中化合物4l对油菜菌核病菌的半最大效应浓度EC50=9.20 mg/L(对照药多菌灵的EC50=5.79 mg/L).
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