16691-25-1Relevant articles and documents
Design, Synthesis, and Study of the Insecticidal Activity of Novel Steroidal 1,3,4-Oxadiazoles
Bai, Hangyu,Jiang, Weiqi,Li, Qi,Li, Tian,Ma, Shichuang,Shi, Baojun,Wu, Wenjun
, p. 11572 - 11581 (2021/10/12)
A series of novel steroidal derivatives with a substituted 1,3,4-oxadiazole structure was designed and synthesized, and the target compounds were evaluated for their insecticidal activity against five aphid species. Most of the tested compounds exhibited potent insecticidal activity against Eriosoma lanigerum (Hausmann), Myzus persicae, and Aphis citricola. Compounds 20g and 24g displayed the highest activity against E. lanigerum, showing LC50 values of 27.6 and 30.4 μg/mL, respectively. Ultrastructural changes in the midgut cells of E. lanigerum were detected by transmission electron microscopy, indicating that these steroidal oxazole derivatives might exert their insecticidal activity by destroying the mitochondria and nuclear membranes in insect midgut cells. Furthermore, a field trial showed that compound 20g exhibited effects similar to those of the positive controls chlorpyrifos and thiamethoxam against E. lanigerum, reaching a control rate of 89.5% at a dose of 200 μg/mL after 21 days. We also investigated the hydrolysis and metabolism of the target compounds in E. lanigerum by assaying the activities of three insecticide-detoxifying enzymes. Compound 20g at 50 μg/mL exhibited inhibitory action on carboxylesterase similar to the known inhibitor triphenyl phosphate. The above results demonstrate the potential of these steroidal oxazole derivatives to be developed as novel pesticides.
Synthesis method of 1, 3, 4-oxadiazole heterocyclic compound
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Paragraph 0021-0023; 0058-0059, (2021/05/05)
The invention belongs to the technical field of organic synthesis and medicines, and particularly relates to a synthesis method of a 1, 3, 4-oxadiazole heterocyclic compound. The 1, 3, 4-oxadiazole heterocyclic compound is obtained by taking a benzaldehyde derivative and a diazonium trivalent iodine reagent as raw materials, taking dichloromethane as a solvent without any catalyst under illumination and carrying out reaction at room temperature. According to the method provided by the invention, the 1, 3, 4-oxadiazole heterocyclic derivative can be obtained by a one-step method under the condition of room temperature through reaction for 10-15 hours, and the yield is 48-89%. According to the reaction, the 1, 3, 4-oxadiazole heterocyclic derivative is simply, conveniently and rapidly synthesized in one step under the illumination condition by using simple and easily available raw materials, and a simple, efficient and mild novel synthesis method is provided for synthesizing the 1, 3, 4-oxadiazole heterocyclic derivative.
Synthesis method of 1, 3, 4-oxadiazole heterocyclic compound
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Paragraph 0013-0015; 0033; 0034, (2020/07/28)
The invention belongs to the technical field of organic synthesis and medicines, and particularly relates to a synthesis method of a 1, 3, 4-oxadiazole heterocyclic compound. The method comprises thefollowing steps: by taking a ketonic acid derivative and
