Protoporphyrinogen oxidase (PPO, EC 1.3.3.4) has been identified as one of the most significant action targets for a large chemically diverse family of herbicides that exhibit some interesting characteristics, such as low use rate, low toxicity to mammals, and low environmental impact. As a continuation of research work on the development of new PPO inhibitors, some benzothiazole analogues of oxadiargyl, an important PPO-inhibiting commercial herbicide, were designed and synthesized by ring-closing of the substituents at the C-4 and C-5 positions. The bioassay results indicated that the series 8, 9, and 10 have good PPO inhibition activity with k_i values ranging from 0.25 to 18.63 μM. Most interestingly, 9l, ethyl 2-((5-(5-tert-butyl-2-oxo-1,3,4-oxadiazol-2(3H)-yl)-6-fluorobenzothiazol-2-yl)sulfanyl) propanoate, was identified as the most promising candidate due to its high PPO inhibition effect (k_i = 1.42 μM) and broad spectrum postemergence herbicidal activity at the concentration of 37.5 g of ai/ha.

中文翻译：

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作为原卟啉原氧化酶抑制剂的新型1,3,4-Oxadiazol-2（3 H）-ones的设计，合成和3D-QSAR分析†

原卟啉原氧化酶（PPO，EC 1.3.3.4）已被确定为化学除草剂家族中最重要的作用目标之一，这些除草剂具有一些有趣的特征，例如使用率低，对哺乳动物的毒性低以及对环境的影响小。 。作为开发新的PPO抑制剂的研究工作的继续，通过在C-4和C-5位上的取代基闭环设计并合成了一些重要的PPO抑制性除草剂恶二argyl的苯并噻唑类似物。的生物测定结果表明，该系列8，9，和10具有良好的PPO抑制活性ķ_我值范围从0.25至18.63微米。最有趣的是9公升，鉴定了2-（（5-（5-叔丁基-2-氧代-1,3,4-恶二唑-2（3 H）-基）-6-氟苯并噻唑-2-基）硫烷基）丙酸乙酯作为其最有前途的候选者，是因为它具有较高的PPO抑制作用（k _i = 1.42μM）和在37.5 g ai / ha的浓度下具有广谱的芽后除草活性。