A series of novel pyraclostrobin derivatives were designed and prepared as antifungal agents. Their antifungal activities were tested in vitro with five important phytopathogenic fungi, namely, Batrylis cinerea, Phytophthora capsici, Fusarium sulphureum, Gloeosporium pestis and Sclerotinia sclerotiorum using the mycelium growth inhibition method. Among these compounds, 5s displayed IC₅₀ value of 0.57 μg/mL against Batrylis cinerea and 5k-II displayed IC₅₀ value of 0.43 μg/mL against Sclerotinia sclerotiorum, which were close to that of the positive control pyraclostrobin (0.18 μg/mL and 0.15 μg/mL). Other compounds 5f, 5k-II, 5j, 5m and 5s also exhibited strong antifungal activity. Further enzymatic assay demonstrated compound 5s inhibited porcine bc₁ complex with IC₅₀ value of 0.95 μM. The statistical results from an integrated computational pipeline demonstrated the predicted total binding free energy for compound 5s is the highest. Consequently, compound 5s with the biphenyl-4-methoxyl side chain could serve as a new motif as inhibitors of bc₁ complex and deserve to be further investigated.

设计并制备了一系列新颖的吡咯菌酯衍生物作为抗真菌剂。它们的抗真菌活性在体外用五个重要植物病原真菌，即，测试Batrylis孢，辣椒疫霉，镰刀菌硫色，盘长孢菌和油菜菌核病使用菌丝生长抑制方法。在这些化合物中，5S显示IC ₅₀值0.57微克/ mL的针对Batrylis灰霉病和5K-II显示IC ₅₀ 0.43微克/毫升的值针对菌核病，接近阳性对照吡咯菌酯的浓度（0.18μg/ mL和0.15μg/ mL）。其他化合物5f，5k-II，5j，5m和5s也表现出强的抗真菌活性。进一步的酶法测定表明化合物5s抑制了猪bc ₁复合物，IC ₅₀值为0.95μM。来自集成计算管道的统计结果表明，化合物5s的预测总结合自由能最高。因此，具有联苯-4-甲氧基侧链的化合物5s可以作为bc ₁抑制剂的新基序 复杂，值得进一步研究。