Natural Biphenyl-Type Neolignans as Resources of Pesticide Candidates: Assembly, Insecticidal Potency, and Cytotoxicity of Honokiol/Magnolol Analogues of Isoxazoline Hybridization via [3+2] Dipolar Cycloaddition

文献类型： 外文期刊

第一作者： Zhi, Xiao-Yan

作者： Zhi, Xiao-Yan;Shi, Hong-Cheng;Yuan, Xin;He, Ming-Tao;Li, Hua-Wei;Guo, Yan-Qiong;Cao, Hui;Yang, Chun

作者机构：

关键词： neolignans; honokiol; magnolol; isoxazoline; 1,3-dipolar cycloaddition; insecticidal activity; cytotoxicity

期刊名称：JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY （ 影响因子：6.2； 五年影响因子：6.4 ）

ISSN： 0021-8561

年卷期： 2025 年 73 卷 7 期

页码：

收录情况： SCI

摘要： Currently, the development of novel pesticides remains a crucial initiative to address the challenges of agricultural pest management. In pursuit of agrochemical candidates derived from plant natural products (NPs), 76 novel isoxazoline-hybridized honokiol/magnolol analogues were assembled via a [3 + 2] dipolar cycloaddition reaction, and their pesticidal potency and cytotoxicity were evaluated. Bioassays revealed that 13 compounds (5d, 6k, 7b-d, 7f, 7g, 8d-f, 13f, 15d, and 16h) exhibited superior larvicidal activity against Plutella xylostella Linnaeus with LC50 values in the range of 1.75-5.87 mu g/mL, outperforming the botanical insecticide rotenone (LC50 = 26.7 mu g/mL). Particularly, compounds 7c, 8d, and 15d showed over 11-fold higher larvicidal activity against P. xylostella than against rotenone. Meanwhile, compounds 5i, 6g, 7a, and 8a displayed better growth inhibitory effects on Mythimna separata Walker (LC50 = 0.13, 0.25, 0.34, and 0.35 mg/mL, respectively) compared to rotenone (LC50 = 0.53 mg/mL). Further greenhouse potted-plant assays revealed that compounds 8d and 15d showed superior in vivo control efficacy against P. xylostella compared to rotenone and comparable to tolfenpyrad and also demonstrated good protective effects on plants. Toxicity tests disclosed that these potent compounds exhibited moderate cytotoxicity to the human keratinocyte cell line (HaCaT), indicating a considerably favorable safety profile for skin exposure. Structure-activity relationship (SAR) analysis illustrated the importance of the exposed hydroxyls and newly introduced isoxazoline scaffolds in enhancing the insecticidal activity of these compounds. The novel scaffold, excellent insecticidal potency, and good safety profile position these compounds reported herein as promising leads for further pesticide candidates development. Furthermore, the present work offers valuable insights for advancing the NP-inspired agrochemical innovation.

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