- Tridentate 3-Substituted Naphthoquinone Ruthenium Arene Complexes: Synthesis, Characterization, Aqueous Behavior, and Theoretical and Biological Studies
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A series of nine RuII arene complexes bearing tridentate naphthoquinone-based N,O,O-ligands was synthesized and characterized. Aqueous stability and their hydrolysis mechanism were investigated via UV/vis photometry, HPLC-MS, and density functional theory calculations. Substituents with a positive inductive effect improved their stability at physiological pH (7.4) intensely, whereas substituents such as halogens accelerated hydrolysis and formation of dimeric pyrazolate and hydroxido bridged dimers. The observed cytotoxic profile is unusual, as complexes exhibited much higher cytotoxicity in SW480 colon cancer cells than in the broadly chemo- (incl. platinum-) sensitive CH1/PA-1 teratocarcinoma cells. This activity pattern as well as reduced or slightly enhanced ROS generation and the lack of DNA interactions indicate a mode of action different from established or previously investigated classes of metallodrugs.
- Geisler, Heiko,Westermayr, Julia,Cseh, Klaudia,Wenisch, Dominik,Fuchs, Valentin,Harringer, Sophia,Plutzar, Sarah,Gajic, Natalie,Hejl, Michaela,Jakupec, Michael A.,Marquetand, Philipp,Kandioller, Wolfgang
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p. 9805 - 9819
(2021/06/30)
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- Sulfonium ylides derived from 2-hydroxy-benzoquinones: Crystal and molecular structure and their one-step conversion into Mannich bases by amine N-oxides
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Reaction of 2-hydroxy-para-benzoquinones with DMSO/Ac2O produced dimethylsulfonium ylides, of which crystal structures as well as solid and liquid state NMR spectra were recorded. The ylides react with tertiary methylamine N-oxides in a one-pot, multi-step process to 3-methylamino- substituted benzoquinones. The mechanism starts with a deoxygenative deprotonation of the amine N-oxides, followed by a formal electrophilic displacement of DMSO by the resulting carbonium-iminium ion.
- Rosenau, Thomas,Mereiter, Kurt,J?ger, Christian,Schmid, Peter,Kosma, Paul
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p. 5719 - 5723
(2007/10/03)
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