中文摘要：

为了寻找高效、低毒、低残留的环境友好杀虫剂，设计并合成了12个新的1-（嘧啶基-4）-3-（2，6-二氟苯甲酰基）脲衍生物6a-61，其结构经IR，^1H NMR，LC／MS和元素分析确证．初步生物活性测试结果表明，部分化合物具有明显的杀虫活性，如6g在100mg／L浓度下，对粘虫（Mythimna sepatara）具有100％的杀虫活性

英文摘要：

In an attempt to find novel pesticides with high activity, low toxicity and low residue, a series of novel 1-（pyrimidin-4-yl）-3-（2,6-difluorobenzoyl）urea derivatives 6a-61 were designed and synthesized. Their structures were confirmed by IR, 1H NMR, LC/MS spectra and elemental analysis. The results of preliminary bioassay showed that some title compounds possessed obvious insecticidal activity, e.g. 6g showed 100% biological activity against Mythimna sepatara at 100 mg/L.