Relevant articles and documents
Quantitative structure-activity relationships on 5-substituted terbenzimidazoles as topoisomerase I poisons and antitumor agents
Kim, Jung Sun Sun, Qun Yu, Chiang Liu, Angela Liu, Leroy F. Lavoie, Edmond J.
Several 5-substituted terbenzimidazoles were synthesized and evaluated as mammalian topoisomerase I poisons and for cytotoxicity against a human lymphoblastoma cell line, RPMI-8402. No correlation was observed between topoisomerase I poisoning activity and the Hansch π value or the σ(meta) and σ(para) values associated with each substituent. These data suggest that electronic effects and relative lipophilicity of substituents at the 5-position of these terbenzimidazoles do not have a significant effect upon intrinsic topoisomerase I poisoning activity. There was, however, a good correlation between the relative π values for the various subtituents evaluated and cytotoxic activity. Experimentally determined log P values did not correlate well with either cytotoxicity or π values. Capacity factors (log k') as determined by high pressure liquid chromatography did correlate well with the π values of varied substituents and cytotoxicity. These data indicate that the relative lipophilic activity of substituents at the 5-position of these terbenzimidazoles can strongly influence relative cytotoxic activity.
Poly(2-aminothiazole) as a unique precursor for nitrogen and sulfur co-doped porous carbon: Immobilization of very small gold nanoparticles and its catalytic application
Bide, Yasamin Nabid, Mohammad Reza Dastar, Fateme
In this contribution, we report two important achievements; first the synthesis of poly(2-aminothiaozle) (P2AT) with a plate structure containing nanoparticles by a rapidly initiated strategy, and second, the one-step synthesis of nitrogen and sulfur co-doped porous carbon materials with unique morphology using P2AT as the source of both N and S, through a simple hydrothermal carbonization reaction. The obtained functional carbon may serve to develop new carbon materials for various applications, especially catalysis, because of the excellent properties, such as straightforward synthesis, defined morphology, high porosity, and heteroatom doping. As one of the most important applications, we used the porous carbon materials as a support for immobilizing gold nanoparticles (AuNPs). Benefiting from the synergistic effects of N and S co-doping, very small AuNPs, and unique structural features, the as-obtained material was demonstrated to be a superior catalyst for reduction of nitrobenzenes.
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