target sites have already developed serious resistance to the main existing classifications of fungicides. In order to discover novel fungicides with a promising activity on rusts, twenty new substituted difluoromethylpyrimidinamine derivatives were designed and synthesized with the aid of the intermediate derivatization methods starting from ethyl 4,4-difluoro-3-oxobutanoate that is the common raw material
锈是最重要的真菌疾病之一,已知的目标部位已经对主要的现有杀真菌剂类别产生了严重的抗性。为了发现对锈病具有广阔前景的新型杀真菌剂,从中间体4,4-二
氟-
3-氧代丁酸乙酯开始,通过中间衍生化方法,设计并合成了二十种新的取代的二
氟甲基嘧啶胺衍
生物。新推出的重要
琥珀酸脱氢酶
抑制剂(
SDHI)杀真菌剂。它们的结构通过1 H NMR,13 C NMR,19 F NMR,IR,元素分析和HRMS鉴定。对所有化合物进行了体内筛选对南部玉米锈病(SCR)的杀菌活性。初步的
生物测定结果表明5-
氯-6-(二
氟甲基)-N-(2-(6-(3-(三
氟甲基)苯氧基)
吡啶-3-基)乙基)
嘧啶-4-胺(化合物 J,R 1 = CHF 2,Alk = CH 2 CH 2,Rn = 3-CF 3)是具有所需的针对SCR的杀真菌活性的最佳结构(
EC 50 = 2.16 mg / L),远高于商品杀菌剂双
氟甲草胺(
EC 50 =