were determined. The results indicated that most of the pyrido[2,3-d] pyrimidine derivatives had no marked inhibitory effect on lettuce at 1 mM. However, most of the pyrido[2,3-d] pyrimidine derivatives possessed good activity against bentgrass at 1 mM. Among them, the most active compound, 3-methyl-1-(2,3,4-trifluorophenyl)pyrido[2,3-d]pyrimidine-2,4(1H,3H)-dione (2o), was as active as the positive
天然产物是用于药物和农药发现的新
化学实体的主要来源。为了发现具有高除草活性的先导化合物,以
2-氯烟酸为起始原料,设计合成了一系列新型
吡啶并[2,3-d]
嘧啶衍
生物。通过 1H NMR、13C NMR 和 HRMS 对其结构进行了表征,并测定了其对双子叶生菜 (Lactuca sativa)、芥菜 (Brassica Campestris)、单子叶翦股颖 (Agrostis stolonifera) 和小麦 (Triticum aestivum) 的除草活性。结果表明,大部分
吡啶并[2,3-d]
嘧啶衍
生物在1 mM浓度下对生菜没有明显的抑制作用。然而,大多数
吡啶并[2,3-d]
嘧啶衍
生物在1 mM时对翦股颖具有良好的活性。其中,活性最强的化合物为3-
甲基-1-(2,3,4-三
氟苯基)
吡啶并[2,3-d]
嘧啶-
2,4(1H,3H)-二
酮(2o)。作为阳性对照,商业
除草剂异恶草酮和
氟啶恶嗪。通过