共查询到17条相似文献,搜索用时 64 毫秒
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为了发现具有良好生物活性的吡唑肟化合物,以唑螨酯为先导化合物,在吡唑肟中引入取代噁唑结构,设计并制备了20个未见文献报道的新型吡唑肟衍生物,利用1H NMR,13C NMR和元素分析确证了目标产物的结构.生物活性测试结果显示,部分目标化合物在500和100μg/mL浓度下对粘虫或蚜虫表现出优良的杀虫活性,其中5-(3-氟苯氧基)-1,3-二甲基-1H-吡唑-4-甲酰基-O-{[5-(4-氯苯基)噁唑-2-基]甲基}肟(9j)、5-(4-氟苯氧基)-1,3-二甲基-1H-吡唑-4-甲酰基-O-{[5-(4-氯苯基)噁唑-2-基]甲基}肟(9k)、5-(4-叔丁基苯氧基)-1,3-二甲基-1H-吡唑-4-甲酰基-O-{[5-(4-氯苯基)噁唑-2-基]甲基}肟(9r)和5-(4-甲氧基苯氧基)-1,3-二甲基-1H-吡唑-4-甲酰基-O-{[5-(4-氯苯基)噁唑-2-基]甲基}肟(9s)在浓度为100μg/mL时对粘虫的防治效果均达100%,5-(4-溴苯氧基)-1,3-二甲基-1H-吡唑-4-甲酰基-O-{[5-(4-氟苯基)噁唑-2-基]甲基}肟(9g)和9s在浓度为100μg/mL时对蚜虫的杀灭活性均为100%.此外,化合物9s在500μg/mL时对朱砂叶螨的防治效果为70%. 相似文献
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为解决抗性问题,寻找新的活性化合物,在前期工作基础上,运用生物等排原理,以吡唑肟醚为骨架,引入了第二代新烟碱类重要药效团氯代噻唑和另一重要基团嘧啶环,设计合成了系列新型吡唑肟醚类化合物.以1H NMR,IR,元素分析及MS进行结构确证,并进行了杀虫、杀螨及杀菌活性测定.部分具有氯代噻唑环的A系列化合物显示了良好的杀蚊虫活性(100%,5 mg·L-1)、杀豆蚜活性(100%,200 mg/L)和杀螨活性(100%,200 mg/L);具有嘧啶环的B系列化合物显示了一定的杀菌活性. 相似文献
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为了寻找具有较好生物活性的吡唑肟醚类衍生物,基于唑螨酯的结构,在吡唑环的4-位引入1,3,4-噁二唑结构,设计合成了15个结构新颖的吡唑肟醚类化合物,它们的结构通过1H NMR、13C NMR、元素分析等手段得到表征.生测研究表明,部分目标化合物在500和100μg/mL浓度下对粘虫(Oriental armyworm)或蚜虫(Aphis medicaginis)都有较好的杀虫效果,其中10a, 10e, 10f和10j在100μg/mL时对粘虫有100%的杀死率, 10g, 10j和10l在100μg/mL时对蚜虫有100%的杀虫活性.另外, 10l在500μg/mL浓度下对朱砂叶螨(Tetranychus cinnabarinus)也具有100%的杀灭效果. 相似文献
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以取代肼和取代乙酰乙酸乙酯为起始原料,依次经闭环、氯酰化、氧化、酯化及取代反应制得1,3-取代-5-氯-4-吡唑甲酰肼(7a, 7d, 7g和7j); 7分别与取代呋喃或噻吩甲醛经加成反应合成了12个新型的吡唑酰腙类化合物(9a~9l),其结构经1H NMR, 13C NMR, IR和元素分析表征。初步的生物活性测试结果表明:在500 μg·mL-1浓度下,部分化合物对烟草花叶病毒(TMV)具有一定的抑制活性,其中1-苯基-3-三氟甲基-5-氯-4-(2-噻吩)-腙基羰基吡唑(9k)的治疗活性、保护活性和钝化活性分别为63.6%, 85.7%和93.1%,与对照药宁南霉素(65.9%, 86.4%和97.8%)相当;在50 μg·mL-1浓度下,部分化合物表现出一定的抑菌活性,其中1,3-二甲基-5-氯-4-(2-噻吩)-腙基羰基吡唑(9b)与1-甲基3-三氟甲基-5-氯-4-(2-噻吩)-腙基羰基吡唑(9e)对小麦赤霉病菌(Gibberella zeae)的抑制率分别为42.5%和46.8%。 相似文献
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Qing-Qing Wang Shu-Guang Zhang Jian Jiao Peng Dai Wei-Hua Zhang 《Molecules (Basel, Switzerland)》2021,26(2)
A series of fluorinated 7-hydroxycoumarin derivatives containing an oxime ether moiety have been designed, synthesized and evaluated for their antifungal activity. All the target compounds were determined by 1H-NMR, 13C-NMR, FTIR and HR-MS spectra. The single-crystal structures of compounds 4e, 4h, 5h and 6c were further confirmed using X-ray diffraction. The antifungal activities against Botrytis cinerea (B. cinerea), Alternaria solani (A. solani), Gibberella zeae (G. zeae), Rhizoctorzia solani (R. solani), Colletotrichum orbiculare (C. orbiculare) and Alternaria alternata (A. alternata) were evaluated in vitro. The preliminary bioassays showed that some of the designed compounds displayed the promising antifungal activities against the above tested fungi. Strikingly, the target compounds 5f and 6h exhibited outstanding antifungal activity against B. cinerea at 100 μg/mL, with the corresponding inhibition rates reached 90.1 and 85.0%, which were better than the positive control Osthole (83.6%) and Azoxystrobin (46.5%). The compound 5f was identified as the promising fungicide candidate against B. cinerea with the EC50 values of 5.75 μg/mL, which was obviously better than Osthole (33.20 μg/mL) and Azoxystrobin (64.95 μg/mL). Meanwhile, the compound 5f showed remarkable antifungal activities against R. solani with the EC50 values of 28.96 μg/mL, which was better than Osthole (67.18 μg/mL) and equivalent to Azoxystrobin (21.34 μg/mL). The results provide a significant foundation for the search of novel fluorinated 7-hydroxycoumarin derivatives with good antifungal activity. 相似文献
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To discover new compounds with favorable herbicidal activity, a range of phenylpyridine moiety-containing pyrazole derivatives were designed, synthesized, and identified via NMR and HRMS. Their herbicidal activities against six species of weeds were evaluated in a greenhouse via both pre- and post-emergence treatments at 150 g a.i./hm2. The bioassay revealed that a few compounds exhibited moderate herbicidal activities against Digitaria sanguinalis, Abutilon theophrasti, and Setaria viridis in post-emergence treatment. For instance, compounds 6a and 6c demonstrated 50% inhibition activity against Setaria viridis, which was slightly superior to pyroxasulfone. Thus, compounds 6a and 6c may serve as the new possible leading compounds for the discovery of post-emergence herbicides. 相似文献