Design, Synthesis, and Insecticidal Activity of 5,5-Disubstituted 4,5-Dihydropyrazolo[1,5-<i>a</i>]quinazolines as Novel Antagonists of GABA Receptors
作者:Xunyuan Jiang、Shuai Yang、Ying Yan、Fei Lin、Ling Zhang、Weijing Zhao、Chen Zhao、Hanhong Xu
DOI:10.1021/acs.jafc.0c02462
日期:2020.12.16
(GABA) receptor antagonists (e.g., fipronil), new GABAergic 5,5-disubstituted 4,5-dihydropyrazolo[1,5-a]quinazolines were designed via a scaffold-hopping strategy and synthesized with a facile method. Among the 50 target compounds obtained, compounds 5a, 5b, 7a, and 7g showed excellent insecticidal activities against a susceptible strain of Plutella xylostella (LC50 values ranging from 1.03 to 1.44 μg/mL)
为了控制对用作γ-氨基丁酸(GABA)受体拮抗剂(例如,氟虫腈)的常规杀虫剂的抗性发展,设计了一种新的GABA能5,5-二取代4,5-二氢吡唑并[1,5- a ]喹唑啉。脚手架跳跃策略并采用简便的方法进行合成。在获得的50种目标化合物中,化合物5a,5b,7a和7g对小菜蛾敏感菌株表现出优异的杀虫活性(LC 50值为1.03至1.44μg/ mL),优于氟虫腈(LC 50 = 3.02μg/ mL)。显着地,化合物5a的杀虫活性对于耐氟虫腈的小菜蛾田间种群,其抗性比氟虫腈高64倍。针对非洲爪蟾卵母细胞中异源表达的家蝇GABA受体的电生理研究表明,化合物5a可以作为有效的GABA受体拮抗剂,IC 50计算为32.5 nM。分子对接表明,化合物5a与家蝇GABA受体的结合姿势与氟虫腈相比可能有所不同,这说明了化合物5a对耐氟虫腈的昆虫有效。这些发现表明化合物5a作为控制田间昆虫的新型GABA受