276254-76-3Relevant academic research and scientific papers
Synthesis, antifungal activity and 3D-QSAR study of novel nopol-based 1,3,4-thiadiazole–thioether compounds
Wang, Xiu,Duan, Wen-Gui,Lin, Gui-Shan,Chen, Ming,Lei, Fu-Hou
, p. 4029 - 4049 (2021/06/21)
A series of novel nopol derivatives containing 1,3,4-thiadiazole–thioether moiety were synthesized from β-pinene, which is a natural, abundant and renewable biomass resource. Their structures were characterized by FT-IR, 1H NMR, 13C NMR, ESI–MS and elemental analysis. In vitro antifungal activity of the target compounds was preliminarily evaluated against eight tested plant pathogens, including Fusarium oxysporum f. sp. cucumerinum, Cercospora arachidicola, Physalospora piricola, Alternaria solani, Gibberella zeae, Rhizoeotnia solani, Bipolaris maydis and Colleterichum orbicalare. The bioassay results revealed that, at the concentration of 50?μg/mL, all the target compounds showed certain inhibition activity against the eight tested fungi. Compounds 5f (R = m–OCH3), 5i (R = m–F) and 5r (R = m–I) had excellent inhibition rates of 77.8%, 88.9% and 77.8%, respectively, against P. piricola, showing much better antifungal activity than that of the positive control chlorothalonil. Meanwhile, compound 5?m (R = p–Cl) displayed antifungal activity of 80.7% against R. solani. Furthermore, the analysis of three-dimensional quantitative structure–activity relationship (3D-QSAR) was performed for the relationship between the structures of the target compounds and their antifungal activity against P. piricola by CoMFA method. A reasonable CoMFA model (n = 6; q2 = 0.597; r2 = 0.985) was established.
Development of Novel (+)-Nootkatone Thioethers Containing 1,3,4-Oxadiazole/Thiadiazole Moieties as Insecticide Candidates against Three Species of Insect Pests
Cheng, Wanqing,Fan, Jiangping,Guo, Yong,Han, Meiyue,Ma, Nannan,Yan, Xiaoting,Yang, Ruige
, p. 15544 - 15553 (2022/01/03)
To improve the insecticidal activity of (+)-nootkatone, a series of 42 (+)-nootkatone thioethers containing 1,3,4-oxadiazole/thiadiazole moieties were prepared to evaluate their insecticidal activities against Mythimna separata Walker, Myzus persicae Sulzer, and Plutella xylostella Linnaeus. Insecticidal evaluation revealed that most of the title derivatives exhibited more potent insecticidal activities than the precursor (+)-nootkatone after the introduction of 1,3,4-oxadiazole/thiadiazole on (+)-nootkatone. Among all of the (+)-nootkatone derivatives, compound 8c (1 mg/mL) exhibited the best growth inhibitory (GI) activity against M. separata with a final corrected mortality rate (CMR) of 71.4%, which was 1.54- and 1.43-fold that of (+)-nootkatone and toosendanin, respectively; 8c also displayed the most potent aphicidal activity against M. persicae with an LD50 value of 0.030 μg/larvae, which was closer to that of the commercial insecticidal etoxazole (0.026 μg/larvae); and 8s showed the best larvicidal activity against P. xylostella with an LC50 value of 0.27 mg/mL, which was 3.37-fold that of toosendanin and slightly higher than that of etoxazole (0.28 mg/mL). Furthermore, the control efficacy of 8s against P. xylostella in the pot experiments under greenhouse conditions was better than that of etoxazole. Structure-activity relationships (SARs) revealed that in most cases, the introduction of 1,3,4-oxadiazole/thiadiazole containing halophenyl groups at the C-13 position of (+)-nootkatone could obtain more active derivatives against M. separata, M. persicae, and P. xylostella than those containing other groups. In addition, toxicity assays indicated that these (+)-nootkatone derivatives had good selectivity to insects over nontarget organisms (normal mammalian NRK-52E cells and C. idella and N. denticulata fries) with relatively low toxicity. Therefore, the above results indicate that these (+)-nootkatone derivatives could be further explored as new lead compounds for the development of potential eco-friendly pesticides.
Synthesis and anticonvulsant activity of 5-aryl-1,3,4-thiadiazole derivatives
Foroumadi,Tabatabai,Gitinezhad,Zarrindast,Shafiee
, p. 31 - 33 (2007/10/03)
5-Aryl-1,3,4-thiadiazole derivatives were synthesized and tested for anticonvulsant activity using the pentylenetetrazole-induced lethal convulsion test. The results showed that 2-amino derivatives have anticonvulsant activity (LD50 > 500 mg kg-1) and this effect was not mediated through benzodiazepine receptors. The fluoro electron-withdrawing substituent on the phenyl ring did not potentiate the activity of the compounds.
