- Design, Synthesis, and Synergistic Activity of Eight-Membered Oxabridge Neonicotinoid Analogues
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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.
- Zhang, Xiao,Wang, Yiping,Xu, Zhiping,Shao, Xusheng,Liu, Zewen,Xu, Xiaoyong,Maienfisch, Peter,Li, Zhong
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p. 3005 - 3014
(2021/04/09)
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- Low emission epoxy resin composition
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An epoxy resin composition, the curing components of which contain at least one amine of formula (I) and optionally at least one amine A which is, in particular, an adduct of a polyamine and an epoxide. The amine for formula (I) is used in particular in the form of a reaction product of the reductive alkylation of 1,2-ethylenediamine and an aldehyde or ketone. The epoxy resin composition is used in particular as a low-emission, room-temperature-curing epoxy-resin coating. It is characterised by good processibility, quick curing, high hardness, a nice surface and a low tendency to yellowing.
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Paragraph 0230-0234
(2021/09/01)
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- Structure-activity relationships of novel substituted naphthalene diimides as anticancer agents
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Novel 1,4,5,8-naphthalenetetracarboxylic diimide (NDI) derivatives were synthesized and evaluated for their antiproliferative activity on a wide number of different tumor cell lines. The prototypes of the present series were derivatives 1 and 2 characterized by interesting biological profiles as anticancer agents. The present investigation expands on the study of structure-activity relationships of prototypes 1 and 2, namely, the influence of the different substituents of the phenyl rings on the biological activity. Derivatives 3-22, characterized by a different substituent on the aromatic rings and/or a different chain length varying from two to three carbon units, were synthesized and evaluated for their cytostatic and cytotoxic activities. The most interesting compound was 20, characterized by a linker of three methylene units and a 2,3,4-trimethoxy substituent on the two aromatic rings. It displayed antiproliferative activity in the submicromolar range, especially against some different cell lines, the ability to inhibit Taq polymerase and telomerase, to trigger caspase activation by a possible oxidative mechanism, to downregulate ERK 2 protein and to inhibit ERKs phosphorylation, without acting directly on microtubules and tubuline. Its theoretical recognition against duplex and quadruplex DNA structures have been compared to experimental thermodynamic measurements and by molecular modeling investigation leading to putative binding modes. Taken together these findings contribute to define this compound as potential Multitarget-Directed Ligands interacting simultaneously with different biological targets.
- Milelli, Andrea,Tumiatti, Vincenzo,Micco, Marialuisa,Rosini, Michela,Zuccari, Guendalina,Raffaghello, Lizzia,Bianchi, Giovanna,Pistoia, Vito,Fernando Díaz,Pera, Benet,Trigili, Chiara,Barasoain, Isabel,Musetti, Caterina,Toniolo, Marianna,Sissi, Claudia,Alcaro, Stefano,Moraca, Federica,Zini, Maddalena,Stefanelli, Claudio,Minarini, Anna
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supporting information
p. 417 - 428
(2013/01/15)
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- Potent inhibition of Norwalk virus by cyclic sulfamide derivatives
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A new class of compounds that exhibit anti-norovirus activity in a cell-based system and embody in their structure a cyclosulfamide scaffold has been identified. The structure of the initial hit (compound 2a, ED50 4 μM, TD50 50 μM) has been prospected by exploiting multiple points of diversity and generating appropriate structure-activity relationships.
- Dou, Dengfeng,Tiew, Kok-Chuan,He, Guijia,Mandadapu, Sivakoteswara Rao,Aravapalli, Sridhar,Alliston, Kevin R.,Kim, Yunjeong,Chang, Kyeong-Ok,Groutas, William C.
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experimental part
p. 5975 - 5983
(2011/11/07)
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