61532-76-1Relevant academic research and scientific papers
Design, Synthesis, and Synergistic Activity of Eight-Membered Oxabridge Neonicotinoid Analogues
Zhang, Xiao,Wang, Yiping,Xu, Zhiping,Shao, Xusheng,Liu, Zewen,Xu, Xiaoyong,Maienfisch, Peter,Li, Zhong
, p. 3005 - 3014 (2021/04/09)
Insecticide synergists are sought-after due to their potential in improving the pesticide control efficacy with a reduced dose of an active ingredient. We previously reported that a cis-configuration neonicotinoid (IPPA08) exhibited specific synergistic activity toward neonicotinoid insecticides. In this study, we synthesized a series of structural analogues of IPPA08 by converting the pyridyl moiety of IPPA08 into phenyl groups, via facile double-Mannich condensation reactions between nitromethylene compounds and glutaraldehyde. All of the oxabridged neonicotinoid compounds were found to increase the toxicity of imidacloprid against Aphis craccivora. Notably, compound 25 at 0.75 mg/L lowered the LC50 value of imidacloprid against A. craccivora by 6.54-fold, while a 3.50-fold reduction of the LC50 value was observed for IPPA08. The results of bee toxicity test showed that compound 25 display selectivity in its effects on imidacloprid toxicity against the honey bee (Apis mellifera L.). In summary, replacing the pyridyl ring with a phenyl ring was a viable approach to obtain a novel synergist with oxabridged moiety for neonicotinoid insecticides.
The structure modification of seven-membered aza-brigded neonicotinoids in order to investigate their impact on honey bees
Cao, Xiaofeng,Chen, Xi,Chen, Yuce,Li, Zhong,Xu, Xiaoyong
, p. 835 - 844 (2021/05/29)
In order to explore the relationship between the structure and the toxicity to honey bees of seven-membered aza-bridged neonicotinoids, 16 novel seven-membered aza-bridged neonicotinoid analogues are synthesized by replacing the pyridine ring, and changing the substituents on the pyridine ring, the electron-withdrawing group NO2 and the imidazole ring of our previously developed aza-bridged neonicotinoid 1-[(6-chloropyridin-3-yl)methyl)]-10-(2,5-dimethylphenyl)-9-nitro-2,3,5,6,7,8-hexahydro-1H-5,8-epiminoimidazo azepine (C-29). The insecticidal bioactivities against cowpea aphid (Aphis craccivora) and the bee toxicities of these compounds are tested. Some of the title compounds present good insecticidal activities against cowpea aphid. The results also show that some of the title compounds exhibit lower bee toxicity than that of C-29 and imidacloprid. This suggests that changing the substituents on the neonicotinoids can influence the toxicity toward honey bees of these analogues.
Oxidation strategy for the synthesis of regioisomeric spiroisobenzofuranopyrroles: Facile entries to spiro[isobenzofuran-1,2′-pyrrole] and Spiro[isobenzofuran-1,3′-pyrrole] derivatives
Fan, Yefeng,Liu, Song,Chen, Nanyang,Shao, Xusheng,Xu, Xiaoyong,Li, Zhong
supporting information, p. 393 - 403 (2015/02/19)
Two practical and efficient approaches have been developed to synthesize two kinds of racemic spiroisobenzofuranopyrrole analogues as regioisomers. In the presence of sodium periodate, cis-indeno[1,2-b]pyrrol-4(1H)-ones were converted into spiro[isobenzofuran-1,2′-pyrrole] derivatives by a two-step process. In addition, oxidative reactions promoted by lead tetraacetate were demonstrated using cis-indeno[2,1-b]pyrrol-8(1H)-ones as substrates, affording spiro[isobenzofuran-1,3′-pyrrole] derivatives. The remarkable features of two approaches included mild and convenient reaction conditions, a broad substrate scope, and moderate to excellent yields. Possible mechanisms were proposed based on the comparison of the intermediates and products.
Nonquaternary reactivators for organophosphate-inhibited cholinesterases
Kalisiak, Jaros?aw,Ralph, Erik C.,Cashman, John R.
experimental part, p. 465 - 474 (2012/03/11)
A new class of amidine-oxime reactivators of organophosphate (OP)-inhibited cholinesterases (ChE) was synthesized and tested in vitro and in vivo. Compared with 2-PAM, the most promising cyclic amidine-oxime (i.e., 12e) showed comparable or greater reactivation of OP-inactivated AChE and OP-inactivated BChE. To the best of our knowledge, this is the first report of a nonquaternary oxime that has, comparable to 2-PAM, in vitro potency for reactivation of Sarin (GB)-inhibited AChE and BChE. Amidine-oximes were tested in vitro, and reactivation rates for OP-inactivated butyrylcholinesterase (BChE) were greater than those for 2-PAM or MINA. Amidine-oxime reactivation rates for OP-inactivated acetylcholinesterase (AChE) were lower compared to 2-PAM but greater compared with MINA. Amidine-oximes were tested in vivo for protection against the toxicity of nerve agent model compounds. (i.e., a model of Sarin). Post-treatment (i.e., 5 min after OP exposure, i.p,) with amidine oximes 7a-c and 12a, 12c, 12e, 12f, and 15b (145 μmol/kg, i.p.) protected 100% of the mice challenged with the sarin model compound. Even at 25% of the initial dose of amidine-oxime (i.e., a dose of 36 μmol/kg, i.p.), 7b and 12e protected 100% of the animals challenged with the sarin nerve agent model compound that caused lethality in 6/11 animals without amidine-oxime.
HETEROCYCLIC SULFONAMIDE DERIVATIVES USEFUL AS MEK INHIBITORS
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Page/Page column 45, (2011/06/11)
The present invention relates to compounds of Formula (IA) Where R1a, R1b, X, R2a, R2b, W, R3, R4, and R5 are as defined herein as well as pharmaceutically acceptable salts thereof. The compounds have been shown to act as MEK inhibitors which may be useful in the treatment of hyperproliferative diseases, like cancer and inflammation.
Heterocyclic Sulfonamide Derivatives
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Page/Page column 16, (2011/08/08)
The present invention relates to compounds of Formula I where R1a, R1b, X, R2a, R2b, W, R3, R4, and R5 are as defined herein as well as pharmaceutically acceptable salts thereof. The compounds have been shown to act as MEK inhibitors which may be useful in the treatment of hyperproliferative diseases, like cancer and inflammation.
Design, synthesis, and bioactivity of cyanonitrovinyl neonicotinoids as potential insecticides
Wang, Kewei,Qian, Xuhong,Cui, Jingnan
scheme or table, p. 1117 - 1122 (2012/06/18)
A series of cyanonitrovinyl neonicotinoids were designed and synthesized via five steps in about 35% overall yields. All compounds were structurally characterized by 1H nuclear magnetic resonance (NMR), 13C NMR, infrared (IR), and high-resolution mass spectrometry (HRMS), and single-crystal X-ray diffraction analysis of 2-[1-[(6-chloropyridin-3-yl)methyl] -2-imidazolidinylidene]-2-nitroacetonitrile revealed that the double bond is (E)-configured. The preliminary agriculture bioassay indicated that one compound exhibited moderate insecticidal activity against pea aphid. Springer-Verlag 2010.
One step from nitro to oxime: a convenient preparation of unsaturated oximes by the reduction of the corresponding vinylnitro compounds
Wang, Kewei,Qian, Xuhong,Cui, Jingnan
experimental part, p. 10377 - 10382 (2010/02/27)
A series of novel unsaturated oximes were conveniently prepared from the corresponding vinylnitro compounds by reduction with SnCl2·2H2O. The structures of the oximes were characterized by 1H and 13C NMR, IR and HRMS, and X-ray crystallography analysis of 1-(6-chloro-pyridin-3-ylmethyl)-4,5-dihydro-1H-imidazole-2-carbaldehyde oxime 2a reveals that, the hydroxyl group is arranged in a trans configuration. Some evidences from a brief investigation suggest that these oximes seem to be formed by reduction of the aci form of nitro aliphatic compounds.
Design, synthesis, and insecticidal activities of novel analogues of neonicotinoids: Replacement of nitromethylene with nitroconjugated system
Shao, Xusheng,Li, Zhong,Qian, Xuhong,Xu, Xiaoyong
scheme or table, p. 951 - 957 (2010/04/05)
To replace nitromethylene pharmacophore with a nitroconjugated system, a series of novel neonicotinoid analogues bearing five-membered aromatic heterocycles were designed and synthesized. Bioassays indicated that some of the synthesized compounds exhibited higher insecticidal activities than imidacloprid against cowpea aphids (Aphis craccivora), armyworm (Pseudaletia separate Walker), Nephotettix bipunctatus (Fabricius), and small brown rice planthopper (Laodelphasx striatellus). Exhilaratingly, the activity levels of derivatives 13a and 13j rivaled that of imidacloprid.
Binding activity of substituted benzyl derivatives of chloronicotinyl insecticides to housefly-head membranes, and its relationship to insecticidal activity against the housefly Musca domestica
Nishiwaki, Hisashi,Nakagawa, Yoshiaki,Takeda, David Y.,Okazawa, Atsushi,Akamatsu, Miki,Miyagawa, Hisashi,Ueno, Tamio,Nishimura, Keiichiro
, p. 875 - 881 (2007/10/03)
Variously substituted benzyl derivatives of chloronlcotinyl insecticides were synthesized with a wide range of substituents including halogens, NO2, CN, CF3 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 α-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.
