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[目的]寻找具有较高抑菌活性的丹皮酚偶氮类化合物。[方法]根据活性拼接原理将具有抑菌活性的偶氮基团引入丹皮酚结构中,合成一系列丹皮酚偶氮类衍生物,并采用菌丝生长速率法对其抑菌活性进行初步筛选。[结果]目标化合物结构经~1H NMR和ESI-MS确证,除化合物4a外,其他化合物均为首次被报道。化合物4b~4h在50 mg/L时对番茄灰霉病菌、玉米大斑病菌、马铃薯早疫病菌表现出比母体丹皮酚及阳性对照百菌清更高的抑制活性,其抑制率均可达到70%以上。[结论]丹皮酚偶氮类化合物表现出较好的抑菌活性,可以将其作为先导化合物,设计合成更多的类似物以获得高效、低毒和对非靶标生物安全的新型杀菌剂。 相似文献
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《化学世界》2017,(7)
以丹皮酚为原料,与溴乙烷在碱性条件下反应,得到乙基丹皮酚醚,其酮羰基与盐酸羟胺反应生成相应的肟,肟羟基与相应的二溴丁烷反应得到乙基丹皮酚肟溴代烷基醚,再将其与不同的胺反应得到5个乙基丹皮酚肟胺基丁基醚衍生物。4a~4e的结构经过红外光谱、核磁共振氢谱和质谱确证。考察了反应温度及投料比对乙基丹皮酚肟收率的影响,得到最佳反应条件为:反应温度50℃,n(乙基丹皮酚)∶n(盐酸羟胺)=1∶3,此条件下收率可达94.0%。体外抗血小板聚集活性结果表明,4a~4e的活性均强于对照药阿司匹林,其中化合物4b的活性最强。特别是中间体乙基丹皮酚肟(2)表现出很好的抗血小板聚集活性。 相似文献
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[目的]寻找具有较高抑菌活性的百里酚偶氮类化合物。[方法]以百里酚为母体,采用组合优化原理合成系列百里酚偶氮类衍生物,并采用菌丝生长速率法对其抑菌活性进行了初步筛选,对抑菌活性较好的化合物测定EC50值。[结果]目标化合物结构经~1H NMR和HR-MS确证,化合物3a、3b、3c、3h、3i和3j为已知化合物,其余化合物3d、3e、3f、3g、3k为首次报道。目标产物3a和3d在100 mg/L对除番茄灰霉病菌外的所有供试病菌均表现出比阳性对照霉灵更高的抑菌活性。化合物3a对玉米大斑病菌和苹果腐烂病菌的EC50值远低于霉灵对2种病菌的EC50值,表现出较好的抑菌活性。[结论]百里酚偶氮类化合物表现出较好的抑菌活性,可在其结构基础上,进行多位点和基团的修饰,有望发现抑菌活性更高的广谱型抑菌化合物,为开发高效、低毒和对非靶标生物安全的新型杀菌剂提供理论参考。 相似文献
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为了研究3/5(3,5)-(二)硝基/氯丹皮酚酰腙类化合物和3/5(3,5)-(二)硝基丹皮酚腙类化合物中具有潜在应用价值的杀虫先导化合物,进一步开发基于丹皮酚的绿色杀虫剂,在1 mg/mL质量浓度下,采用小叶碟添加法分别测定了21个3/5(3,5)-(二)硝基/氯丹皮酚酰腙类化合物(1~21)和18个3/5(3,5)-(二)硝基丹皮酚腙类化合物(22~39)对三龄前期草地贪夜蛾的毒杀活性。结果表明,所测共计39个目标化合物中5个化合物(12、13、30、32和34)表现出最好的杀虫活性,其最终校正死亡率分别为75.0%、71.4%、71.7%、71.4%和70.4%,显著高于阳性对照川楝素(50.0%),特别是化合物12,表现出显著的杀虫活性,其最终校正死亡率达75.0%;整体而言,丹皮酚腙类化合物杀虫活性优于丹皮酚酰腙类化合物;在丹皮酚C-3、C-5位引入硝基或氯原子,在其羰基位引入席夫碱(即酰腙和腙),均能提高丹皮酚类衍生物的杀虫活性。 相似文献
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设计合成了9个N-(1,4-取代吡唑-5-基)-1,2,3-噻二唑酰胺类化合物,测试了化合物对小麦赤霉病菌(Gibberella zeae)、辣椒枯萎病菌(Fusarium oxysporum)和苹果腐烂病菌(Cytospora mandshurica)的抑制活性。初步结果表明,目标化合物在50μg/mL浓度下对小麦赤霉病菌、辣椒枯萎病菌和苹果腐烂病菌有一定的抑制作用,其中化合物8j对小麦赤霉病菌的抑制率达到47.6%,接近对照药剂恶霉灵;化合物8d对苹果腐烂病菌的抑制率达到56.8%,与对照药剂恶霉灵相当,具有进一步研究的价值。 相似文献
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Hao Wang Shuang-Xi Ren Ze-Yu He De-Long Wang Xiao-Nan Yan Jun-Tao Feng Xing Zhang 《International journal of molecular sciences》2014,15(3):4257-4272
Aimed at developing novel fungicides for relieving the ever-increasing pressure of agricultural production caused by phytopathogenic fungi, 28 new hydrazone derivatives of carabrone, a natural bioactive sesquisterpene, in three types were designed, synthesized and their antifungal activities against Botrytis cinerea and Colletotrichum lagenarium were evaluated. The result revealed that all the derivatives synthesized exhibited considerable antifungal activities in vitro and in vivo, which led to the improved activities for carabrone and its analogues and further confirmed their potential as antifungal agents. 相似文献
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1,2,3-三氮唑桥连水杨醛类席夫碱菊糖衍生物的合成及抑菌活性研究 总被引:1,自引:0,他引:1
先对菊糖C-6位的羟基进行溴代激活,形成易离去基团,再用叠氮基亲核置换易离去基团,最后将水杨醛类丙炔胺席夫碱中间体通过Huisgen-Click反应与叠氮代菊糖中间体桥连,得到1,2,3-三氮唑桥连水杨醛类席夫碱菊糖衍生物(4a~4c),通过红外光谱对其结构进行了表征,并测定其抑菌活性。结果表明,与菊糖相比,菊糖衍生物的抑菌活性明显提高,当浓度为1 000μg·mL-1时,化合物4a对黄瓜炭疽病菌(Colletotrichum lagenarium)、西瓜枯萎病菌(Fusarium oxysporium)和芦笋茎枯病菌(Phomopsis asparagi)的抑制率分别为66.7%、42.0%和58.1%。通过对菊糖进行针对性化学修饰,接入具有抑菌活性的基团,可以在一定程度上提高菊糖的抑菌活性,为进一步开发利用菊糖提供了依据。 相似文献
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The dish pack method, which measures growth inhibition or promotion effects of volatile compounds on germinating seeds, was
applied to measure the antifungal effects of 52 dried samples of spices and herbs against a soil-borne phytopathogenic fungus,
Fusarium oxysporum. Black zira showed the strongest effect, followed by cumin and cardamom. Headspace sampling and gas chromatography–mass spectrometry
analysis of black zira identified seven volatile compounds, γ-terpinene, limonene, p-cymene, β-pinene, α-pinene, cuminaldehyde, and myrcene. Among these, cuminaldehyde and p-cymene showed the strongest antifungal activities against F. oxysporum, suggesting roles in the antifungal activity of black zira. The same compounds also showed antifungal activities against
another soil-borne phytopathogenic fungus, Verticillium dahliae, and foliar phytopathogenic fungi, Botrytis cinerea and Alternaria mali. The total activity calculated from the concentration of cuminaldehyde contained in black zira and its EC50 against F. oxysporum demonstrated that cuminaldehyde is the main antifungal compound detected in black zira. 相似文献
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Diseases caused by systemic fungal infections have become a significant clinical problem in recent decades. A series of glycosyl derivatives of the approved cyclic peptide antifungal drug caspofungin conjugated with β‐D ‐glucopyranose, β‐D ‐galactopyranose, β‐D ‐xylopyranose, β‐L ‐rhamnopyranose, β‐maltose and β‐lactose units were designed, synthesized, and evaluated as new potential antifungal drugs. The compounds were obtained by coupling the corresponding glycosyl amines to the free primary amino groups of caspofungin through a bifunctional glutaryl linker. In contrast to caspofungin, these glycosylated derivatives are soluble in water, but are not hygroscopic and moreover, are more stable than caspofungin under high humidity and temperature. CD studies showed that glycosylation has very little impact on the conformation of the cyclic peptide of caspofungin. In vitro antifungal tests against seven human pathogenic fungi revealed that the caspofungin–monosaccharide conjugates, but not the disaccharide conjugates, have increased antifungal activities against the majority of tested fungus species relative to caspofungin. The β‐D ‐glucopyranosyl derivative 2 a showed the strongest and broadest antifungal activity, providing a lead for further studies. 相似文献
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We recently reported the design and synthesis of azole antifungal agents with a focus on modifications to the side chain appended to the propanol group. Herein we have identified a series of new 1-[(biarylmethyl)methylamino] derivatives with broad-spectrum antifungal activities against the most prevalent human pathogenic fungi (Candida spp. and Aspergillus fumigatus). Compounds containing a flexible benzylamine moiety were clearly shown to yield the best antifungal activities, without the need for a hydrogen-bond acceptor substituent directly attached to the para position. We were also able to determine that selected compounds are able to overcome gene overexpression and point mutations that lead to reduced susceptibility or resistance against current treatments, such as fluconazole. As the minor differences observed with small structural modifications cannot be explain with only a three-dimensional model of CYP51, adequate physicochemical parameters must be evaluated in terms of antifungal potency, bioavailability, and toxicity. Therefore, structure-activity relationship studies such as these reveal new insights for the development of future antifungal therapies. 相似文献
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《Journal of Sulfur Chemistry》2013,34(5):445-453
1,3-Thiazolidine-2,4-dione 2 has been synthesized by the cyclisation reaction of thiourea and chloroacetic acid in the presence of ethanol. The reaction of compound 2 with substituted aromatic aldehyde afforded the corresponding derivatives of substituted 5-benzylidene-1,3-thiazolidinone-2,4-dione 3a–d, which upon reflux with ω-bromoalkoxyphthalimide gave 2-{[-5-(substituted benzylidine)-2,4-dioxo-1,3-thiazolidine-3-yl]alkoxy} -1H-isoindole-1,3(2H)-dione 4a–i. Further, compounds 4a–i were treated with phenyl hydrazine and 2,4 dinitro phenyl hydrazine in the DMF to yield the title compound 2-[5-oxo-2,3-substituted diphenyl-2H-pyrazolo[3,4-d][1,3]thiazol-6(5H)-yl)alkoxy]-1H-isoindole-1,3(2H)-dione 5a–r. Structures of newly synthesized compounds were established based on elemental analysis, IR, 1H NMR and mass spectral data. Synthesized compounds have been assayed for their antibacterial activities against B. subtilis, K. pneumoniae, P. aeruginosa and S. aureus and antifungal activities against A. fumigatus and C. albicans. 相似文献
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Iman A. Gad El-Karim Mahasen S. Amine Amal A. Mahmoud Alaa S. Gouda 《Journal of surfactants and detergents》2014,17(3):509-523
Reaction of stearic acid with semicarbazide in refluxing POCl3 afforded 2-amino-5-heptadecyl 1,3,4-oxadiazole. Acylation of the amino group with acetic anhydride, ethyl chloroacetate and chloroacetic acid gave amide and β-amino acid derivatives. These compounds were cyclized to imidazo[2,1-b]oxadiazole derivatives by two different techniques. Treating the starting oxadiazole compound with P2S5, hydroxyl amine and hydrazine hydrate in benzene afforded thiadiazole and triazole derivatives. Unexpectedly, triazolo[3,4-b][1,3,4]oxadiazole derivative was obtained when 1,3,4-oxadiazole derivative was refluxed with hydrazine hydrate in ethanol. The biological activities of the synthesized compounds were screened in vitro against some gram positive and gram negative bacteria and fungi. Addition of quantitative amount of propylene oxide units (3, 5, 7 mol) to the synthesized compounds afforded new nonionic surfactants. The physico-chemical and surface properties of the novel synthesized surfactants such as surface and interfacial tension, cloud point, wetting time, emulsion stability, foam height, CMC, resistance to hydrolysis and their biodegradability were investigated. In addition, surface parameters including effectiveness (π CMC), efficiency (PC20), maximum surface excess (Γmax) and (A min) were examined. 相似文献
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为发现杀菌活性高、抑菌谱广的新化合物,以芳醛、硝基甲烷及叠氮化钠为起始原料,经环化、氯化、烃化反应合成了15个2-取代-4-氯-5-芳基-2H-1,2,3-三唑类新化合物,目标物的分子结构经核磁共振谱、质谱和元素分析进行了确证。采用菌丝生长速率测定法,在25 mg/L的测试浓度下,目标化合物对小麦赤霉病菌、辣椒疫霉病菌、烟草赤星病菌、黄瓜灰霉病菌、水稻纹枯病菌及油菜菌核病菌6种作物病菌进行了离体抑菌活性试验。初步的抑菌活性测试结果表明:化合物4d对小麦赤霉病菌、黄瓜灰霉病菌及油菜菌核病菌的抑制率分别为70.4%、74.1%和72.9%,化合物4k对黄瓜灰霉病菌及油菜菌核病菌的抑制率分别为87.0%及84.7%。4d对辣椒疫霉病菌的抑制率为61.4%,高于商品化品种苯醚甲环唑的42.5%。 相似文献