Synthesis, crystal structure, and biological evaluation of a novel eight-membered dinitration neonicotinoid analogues
作者:Xiao Zhang、Weiwei Yu、Xiaoyong Xu、Xusheng Shao、Zhong Li
DOI:10.1016/j.bmcl.2021.127960
日期:2021.7
intermediate synthesis, a serendipitous reaction of introducing nitro group from nitromethylene has been observed. Instead of expected dihydroxy compounds, dinitration structures with nitromethylene analogues were prepared under mild conditions by using a metal-free catalyst B(OH)3. In this reaction, the extra nitro group was suggested to be from starting material. Bioassays indicated that compound 3a showed
Binding activity of substituted benzyl derivatives of chloronicotinyl insecticides to housefly-head membranes, and its relationship to insecticidal activity against the houseflyMusca domestica
作者:Hisashi Nishiwaki、Yoshiaki Nakagawa、David Y Takeda、Atsushi Okazawa、Miki Akamatsu、Hisashi Miyagawa、Tamio Ueno、Keiichiro Nishimura
Variously substituted benzyl derivatives of chloronicotinyl insecticides were synthesized with a wide range of substituents including halogens, NO2, CN, CF, and small alkyl and alkoxy groups at the ortho, meta and para positions, as well as multiple-substituted benzyl analogues. Their binding activity to the alpha-bungarotoxin binding site in housefly (Musca domestica) head membrane preparations was measured. Among the compounds tested, the activity of the meta-CN derivative was the highest, being 20-100 times higher than those of imidacloprid, acetamiprid and nitenpyram. The synergized insecticidal activity against houseflies was also measured for selected compounds with the metabolic inhibitor, NIA16388 (propargyl propyl phenylphosphonate). For the nitromethylene analogues, including both benzyl and pyridylmethyl analogues, higher binding activity usually resulted in higher insecticidal activity. (C) 2000 Society of Chemical Industry.