The First Ruthenium-Based Paullones: Syntheses, X-ray Diffraction Structures, and Spectroscopic and Antiproliferative Properties in Vitro
datasetposted on 2007-04-30, 00:00 authored by Wolfgang F. Schmid, Stefanie Zorbas-Seifried, Roland O. John, Vladimir B. Arion, Michael A. Jakupec, Alexander Roller, Markus Galanski, Ion Chiorescu, Haralabos Zorbas, Bernhard K. Keppler
Two novel paullone derivatives, namely, 6-(α-picolylamino)-7,12-dihydroindolo[3,2-d]benzazepine (L1) and 9-bromo-6-(α-picolylamino)-7,12-dihydroindolo[3,2-d]benzazepine (L2), have been prepared. The reaction of cis-[RuCl2(DMSO)4] (DMSO = dimethyl sulfoxide) with L1 and L2 in a 1:1 molar ratio in dry ethanol at 50 °C afforded the complexes trans-[RuIICl2(DMSO)2L1] (1a) and trans-[RuIICl2(DMSO)2L2] (1b) in 26 and 30% yield, respectively. The reaction carried out from the same starting compounds in a 1:2 molar ratio at 75 °C led to the formation of [RuIICl(DMSO)(L1)2]Cl (2a) and [RuIICl(DMSO)(L2)2]Cl (2b) in 16 and 23% yield, correspondingly. The products were characterized by elemental analysis, one- and two-dimensional NMR spectroscopy, electrospray ionization mass spectrometry, IR spectroscopy, electronic spectra, cyclic voltammetry, and X-ray crystallography (L1, L2, 1a, and 2b). Complexes 2a and 2b exhibit remarkable antiproliferative activity in three human carcinoma cell lines, A549 (non-small cell lung carcinoma), CH1 (ovarian carcinoma), and SW480 (colon carcinoma). The novel complexes show an intercalative mode of interaction with DNA, which may render them attractive alternatives to metal compounds with a coordinative mode of interaction.
Antiproliferative PropertiesComplexes 2ratiocyclic voltammetry2 bmolarnovel complexes showtranL 2L 1antiproliferative activityDNAcolon carcinomaintercalative modecoordinative modeinteractionIR spectroscopyVitroTwo novel paullone derivativesCH2 b exhibitSW 480metal compoundscarcinoma cell linesNMR spectroscopydimethyl sulfoxideRuIIClelectrospray ionization mass spectrometryDMSO