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[方法]脲嘧啶类化合物和苯氧羧酸类化合物均具有较高的生物活性.为了寻找高效、低毒的除草活性化合物,以2,4-二氯苯胺和3-氨基-4,4,4-三氟甲基丁烯酸乙酯为原料,经关环、氮甲基化、硝化、还原得到中间体3-(5-胺基-2,4-二氯苯基)-6-(三氟甲基)-1-甲基嘧啶-2,4(1H,3H)-二酮,其与芳氧乙(丙)酰氯反应,合成了16个未见文献报道的N-[4氯-2-取代-5(3-甲基-2,6-二氧-4-三氟甲基-2,3-二氢嘧啶-1(6H)-基)苯基]-N-取代苯氧乙(丙)酰胺类化合物(31,所有目标化合物结构均通过1H NMR、IR、LC/MS确认.[结果]在75 g a.i./hm2剂量下芽后茎叶处理,化合物3d、3f、3i化合物对刺苋、藜双子叶杂草的抑制率达90%以上,表现出较好的抑制活性;化合物3d、3f对苘麻的抑制率分别达80%、90%,但是大部分化合物无活性.[结论]将具有不同除草机理除草活性的脲嘧啶结构与苯氧羧酸结构有机的结合起来,从生物活性来看,初步设计的化合物不是很成功,该类化合物的结构优化正在进行中. 相似文献
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为了研究2-(N-苯磺酰基吲哚-3-基)-3-N-酰基-5-苯基-1,3,4-噁唑啉类化合物中具有潜在应用价值的抑菌先导化合物。在0.1 g/L质量浓度下,采用菌丝生长速率法测定了14种2-(N-苯磺酰基吲哚-3-基)-3-N-酰基-5-苯基-1,3,4-唑啉类化合物对小麦赤霉病菌、白菜黑斑病菌、棉花枯萎病菌、水稻稻瘟病菌和烟草赤星病菌的室内抑菌活性。结果表明,化合物1~化合物14对所测5种植物病原菌均表现出不同程度的抑菌活性,其中化合物9和化合物14对小麦赤霉病菌、白菜黑斑病菌、棉花枯萎病菌、水稻稻瘟病菌和烟草赤星病菌5种植物病原菌活性较好,其抑制率分别为15.69%~31.08%和16.28%~29.41%,表现出一定的广谱抑菌活性。初步拟定将这2个化合物作为进一步衍生修饰的先导化合物。 相似文献
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合成了9个N-[2,4-二取代-5-(3-甲基-2,6-二氧-4-三氟甲基-2,3-二氢嘧啶-1(6H)-基)苯基]酰胺类化合物。其化学结构经1H NMR、LC-MASS、IR元素分析确证。初步生物活性测定表明:标题化合物具有较好的除草活性,如在有效成分75 g/hm2剂量下,采取茎叶处理,化合物8b、8c对双子叶杂草苘麻、刺苋和藜的抑制率均不低于90%。 相似文献
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咪唑和三唑醚类化合物的合成及生物活性 总被引:1,自引:0,他引:1
以2,4-二氯-α-氯代苯乙酮、取代甲苯、咪唑、三唑为起始原料,合成了9个咪唑醚类和16个三唑醚类化合物,所有化合物结构经1HNMR、IR和元素分析进行了确证,对化合物对马铃薯晚疫病菌(Phytophthoro infestans)和秧苗枯萎病菌(Phizoctonia)的抑菌活性进行了测定,测定表明,25个化合物都有不同程度的抑菌活性,其中Ⅲa、Ⅲb、Ⅲd、Ⅳg、Ⅴb、Ⅴc等6个化合物质量浓度为50 mg/L和10 mg/L时,对两种病菌的抑菌率达80%和50%以上,初步分析了化合物抑菌活性与结构的关系。 相似文献
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为寻找高生物活性的吡唑酰胺类化合物,设计、合成一系列含硫结构的N-吡啶基吡唑-4-酰胺类衍生物,目标化合物结构经1HNMR、13CNMR和有机元素分析或高分辨质谱确证,并进行了杀虫及杀菌活性测试研究。初步杀虫活性测试结果表明,目标化合物在200mg/L对东方粘虫具有中等杀虫活性。同时,测试了目标化合物在50mg/L对5种病菌的离体抑菌活性,化合物N-[(4-氯-2-甲基-6-甲酰胺基)苯基]-1-(3-氯-2-吡啶基)-3-硫甲基-1H-吡唑-4-甲酰胺If和N-[(4-氯-2-甲基-6-环丙基酰胺基)苯基]-1-(3-氯-2-吡啶基)-3-硫甲基-1H-吡唑-4-甲酰胺Ig对番茄早疫病菌显示了良好的活性,分别为65.2%和67.1%, 高于对照药百菌清,值得进一步研究。 相似文献
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Zuming Liu Guangfu Yang Xianghua Qin 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2001,76(11):1154-1158
In a search for novel agrochemicals with high activity and low toxicity, a series of diheterocyclic compounds containing 1,2,4‐triazolo[1,5‐a]pyrimidine and 1,3,4‐oxadiazole rings were designed and synthesized by a four‐step synthetic route starting from 2‐mercapto‐5,7‐dimethyl‐1,2,4‐triazolo[1,5‐a]pyrimidine. The structures of all the compounds synthesized were confirmed by 1H NMR, mass spectroscopy and elemental analysis. The preliminary bioassay against Brassica campestris L and Echinochloa crusgalli Beavu indicated that the title compounds displayed herbicidal activity at the concentration of 100 ppm and that compounds 5a (R = CH3), 5d (R = C2H5) and 5f (R = i‐Bu) were found to have particularly high activities. In addition, the results of an in vivo test at a concentration of 50 ppm showed that all the compounds prepared were highly active against Rhizoctonia slain, but not active against Fusarium oxysporum, Gibberella zeave and Phoma sparagi. A further in vivo test showed that compound 5j possessed better fungicidal activity against Rhizoctonia solani at a concentration of 200 ppm than Carbendazim and Validamycin A, which are well known for their fungicidal activity against Rhizoctonia solani. To our knowledge, this is the first report that 1,2,4‐triazolo[1,5‐a]pyrimidine derivatives display fungicidal activity against Rhizoctonia solani. © 2001 Society of Chemical Industry 相似文献
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Guo-Xiang Sun Ming-Yan Yang Yan-Xia Shi Zhao-Hui Sun Xing-Hai Liu Hong-Ke Wu Bao-Ju Li Yong-Gang Zhang 《International journal of molecular sciences》2014,15(5):8075-8090
In order to investigate the biological activity of novel 1,2,4-triazole compounds, seventeen novel 1,2,4-triazole derivatives containing pyridine moiety were synthesized under microwave assistant condition by multi-step reactions. The structures were characterized by 1H NMR, MS and elemental analyses. The target compounds were evaluated for their fungicidal activities against Stemphylium lycopersici (Enjoji) Yamamoto, Fusarium oxysporum. sp. cucumebrium, and Botrytis cinerea in vivo, and the results indicated that some of the title compounds displayed excellent fungicidal activities. Theoretical calculation of the title compound was carried out with B3LYP/6-31G (d,p). The full geometry optimization was carried out using 6-31G (d,p) basis set, and the frontier orbital energy, atomic net charges were discussed, and the structure-activity relationship was also studied. 相似文献
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Jintao Han Hongbo Dong Zhihong Xu Jianping Lei Mingan Wang 《International journal of molecular sciences》2013,14(6):12484-12495
The sequential sulfonylation/desulfination reactions of 5-benzylthiohydantoin with excess arylsulfonyl chlorides in the presence of triethylamine have been developed to afford a wide range of 5-arylidene thiohydantoin derivatives in moderate to excellent yields. A plausible sulfonylation/desulfination mechanism was proposed. The bioassay showed that these compounds exhibit certain fungicidal activities with the 71.9% inhibition rate of 2K against B. cinerea, and 57.6% inhibition rate of 2m against A. solani, respectively. 相似文献