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以取代杂环羧酸为起始原料,在1,3,4-噁二嗪-5-酮的2-位上分别引入呋喃环、吡啶环及氯代噻吩环,合成了31个未见报道的2-杂环基-1,3,4-噁二嗪酮化合物,其化学结构经核磁共振氢谱和元素分析确证。初步的生物活性测定结果表明,该类化合物具有良好的除草活性,如在质量浓度200 mg/L时,化合物 E14、E16、E20、E21 对马唐Digitaria sanguinalis的抑制率大于90%,化合物 E06、E07、E10、E14、E16、E20 对苋菜Ambrosia tricolor的抑制率也大于90%。 相似文献
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The mononuclear nickel(II) complex bis(azido‐κN)bis[2,5‐bis(pyridin‐2‐yl)‐1,3,4‐thiadiazole‐κ2N2,N3]nickel(II) protects tomato from Verticillium dahliae by inhibiting fungal growth and activating plant defences 下载免费PDF全文
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为了扩展1,3,4-噻二唑类衍生物的抑菌谱,以芳香醛和氨基硫脲为原料,合成6个2-氨基-5-芳基-1,3,4-噻二唑类化合物,采用~1H NMR与~(13)C NMR对其结构进行表征,利用菌丝生长速率法测定目标化合物对5种供试植物病原真菌的离体抑菌活性。结果表明,6个化合物对小麦赤霉病菌和番茄灰霉病菌的抑菌活性均高于其他供试病原真菌。通过结构与活性相关性初步分析可知,此类化合物骨架中对氟苯基对抑菌活性的贡献优于其他取代基,对应化合物B4(2-氨基-5-对氟苯基-1,3,4-噻二唑)对小麦赤霉病菌和番茄灰霉病菌的EC_(50)值分别为23.17和20.22μg·mL~(-1)。 相似文献
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Shaukath A Khanum Sheena Shashikanth Syagadadu Giriyanna Sathyanarayana Siddalingaiah Lokesh Saligrama A Deepak 《Pest management science》2009,65(7):776-780
BACKGROUND: Finger millet is a major food crop as well as feed and fodder for livestock, especially in regions of southern India. A sturdy crop to fluctuating environmental conditions, it can be cultivated in all seasons of the year. Leaf, neck and finger blast caused by Pyricularia grisea Sacc. and Bipolaris setariae (Saw.) Shoem, as well as leaf spot disease, Bipolaris nodulosa (Berk & M.A.Curtis) Shoem, are major production constraints in southern India. Apart from environmental conditions, the use of harvested seeds by farmers is a major reason for disease prevalence. Benzophenone analogues have been investigated for controlling phytopathogenic fungi. In addition, the most important applications of azetidin‐2‐ones are as antibiotics. Based on this information, the present study was conducted to explore the antifungal activity of integrated 2‐azetidinonyl and 1,3,4‐oxadiazoles moieties into a benzophenone framework. RESULTS: A simple high‐yielding method for the integration of heterocyclic rings, namely 2‐azetidinonyl, at the benzophenone nucleus has been achieved, starting from substituted 2‐hydroxybenzophenones under mild conditions on a wet solid surface using microwave irradiation. In the present study, an array of newly synthesised compounds, 2‐azetidinonyl‐5‐(2‐benzoylphenoxy)methyl‐1,3,4‐oxadiazoles, were screened for their antifungal property against blast and leaf spot causing fungi associated with the seeds of finger millet, cv. Indof‐9. CONCLUSION: Two of the newly synthesised compounds showed promising effects in depleting the incidence of seed‐borne pathogenic fungi of finger millet. The suppression of Pyricularia grisea and Bipolaris setariae resulted in enhanced seed germination and seedling growth. Copyright © 2009 Society of Chemical Industry 相似文献
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