class of herbicides. In a continuing effort to discover novel AHAS inhibitors to overcome weed resistance, a series of pyrimidine–biphenyl hybrids (4aa–bb and 5aa–ah) were designed and synthesized via a scaffold hopping strategy. Among these derivatives, compounds 4aa (Ki = 0.09 μM) and 4bb (Ki = 0.02 μM) displayed higher inhibitory activities against Arabidopsis thaliana AHAS than those of the controls
杂草对乙酰羟酸合酶(
EC 2.2.1.6,AHAS)
抑制剂的抗性问题已成为此类
除草剂应用的最大障碍之一。为了不断发现新的AHAS
抑制剂以克服杂草抗性,通过脚手架跳跃策略设计并合成了一系列
嘧啶-
联苯杂化物(4AA - BB和5aa - ah)。在这些衍
生物中,化合物4AA(K i = 0.09μM)和4BB(K i = 0.02μM)对拟南芥AHAS的抑制活性比对照双嘧菌(K i = 0.54μM)和
氟美沙仑(K i = 0.38μM)。值得注意的是,化合物4AA,4BB,5ah和5ag表现出优异的出苗后除草活性,并且在37.5–150 g活性成分(ai)/公顷的施用量下具有广泛的杂草控制能力。此外,4AA和4BB显示对AHAS
抑制剂抗性更高的除草活性播娘蒿,
水苋菜属根结线虫,和相应的敏感杂草比双嘧
苯甲酸在0.94-0.235克活性成分/公顷。因此,
嘧啶-
联苯基序和
铅化合物4AA和4BB 在