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首页> 外文期刊>Bioorganic and Medicinal Chemistry Letters >cis-Nitromethylene neonicotinoids as new nicotinic family: synthesis, structural diversity, and insecticidal evaluation of hexahydroimidazo(1,2-alpha)pyridine.
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cis-Nitromethylene neonicotinoids as new nicotinic family: synthesis, structural diversity, and insecticidal evaluation of hexahydroimidazo(1,2-alpha)pyridine.

机译：顺式亚硝基新烟碱类作为新的烟碱类：六氢咪唑并（1,2-α）吡啶的合成，结构多样性和杀虫性评估。

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摘要

A series of neonicotinoids analogues of hexahydroimidazo[1,2-alpha]pyridine were modified at 5-, 6-, and 7-positions, and their insecticidal activities were evaluated. Introducing a methyl or ethyl at 7-position increased the insecticidal activities, while other substituents decreased activities. When alkyl substituents were introduced to 7-position, the insecticidal activities against Pea aphids decreased in the order methyl (7a)>ethyl (7b)>n-butyl (7e)>phenyl (7f)>n-propyl (7c)>iso-propyl (7d), p-NO(2)-phenyl (7g). Modifications at 5-, 6- or both at 6- and 7-positions with methyl or ethyl were unfavorable to activities. Interestingly, introducing methyl to 7-position not only increased insecticidal activities against pea aphids, but also show higher insecticidal activities than imidacloprid against imidacloprid-resistant brown planthopper.
机译：在5-，6-和7-位上修饰了一系列六氢咪唑并[1,2-α]吡啶的新烟碱类似物，并评估了它们的杀虫活性。在7位引入甲基或乙基可提高杀虫活性，而其他取代基则可降低杀虫活性。当将烷基取代基引入7位时，对豌豆蚜虫的杀虫活性按甲基（7a）>乙基（7b）>正丁基（7e）>苯基（7f）>正丙基（7c）>异-丙基（7d），对-NO（2）-苯基（7g）。用甲基或乙基在5-，6-或6-和7-位进行的修饰不利于活性。有趣的是，将甲基引入7位不仅增加了对豌豆蚜虫的杀虫活性，而且还显示出比吡虫啉对耐吡虫啉的褐飞虱具有更高的杀虫活性。

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