Synthesis, β-haematin inhibition, and in vitro antimalarial testing of isocryptolepine analogues: SAR study of indolo[3,2-c]quinolines with various substituents at C2, C6, and N11
摘要:
A series of indolo[3,2-c]quinolines were synthesized by modifying the side chains of the omega-aminoalkylamines at the C6 position and introducing substituents at the C2 position, such as F, Cl, Br, Me, MeO and NO2, and a methyl group at the N11 position for an SAR study. The in vitro antiplasmodial activities of the derivative agents against two different strains (CQS: NF54 and CQR: K1) and the cytotoxic activity against normal L6 cells were evaluated. The test results showed that compounds 6k and 6l containing the branched methyl groups of 3-aminopropylamino at C6 with a Cl atom at C2 exhibited a very low cytotoxicity with IC50 values above 4000 nM, high antimalarial activities with IC50 values of about 11 nM for CQS (NF54), IC50 values of about 17 nM for CQR (K1), and RI resistance indices of 1.6. Furthermore, the compounds were tested for beta-haematic inhibition, and QSAR revealed an interesting linear correlation between the biological activity of CQS (NF54) and three contributing factors, namely solubility, hydrophilic surface area, and beta-haematin inhibition for this series. In vivo testing of 6l showed a reduction in parasitaemia on day 4 with an activity of 38%. (C) 2014 Elsevier Ltd. All rights reserved.
Synthesis and in vitro cytotoxic effect of 6-amino-substituted 11H- and 11Me-indolo[3,2-c]quinolines
摘要:
A series of 6-amino-11H- indolo[3,2-c]quinoline derivatives with various substituents on the quinoline ring were synthesized. A methyl group introduced to N-11 of the intermediate 4 to elaborate novel analog 7. The cytotoxic effect of these 6-amino-substituted 11H- and 11-methyl-indolo[3,2-c]quinoline derivatives in vitro were tested against MV4-11 (human leukemia), A549 (non-small cell lung cancer) and HCT116 (colon cancer) and BALB/3T3 (normal murine fibroblasts). All the N-11 methylated compounds significantly increased the cytotoxicity. Compound 7p was most active with the IC50 value of 0.052 mu M against the MV4-11 cell line, and also exhibited a selective activity against A549, HCT116 and BALB/3T3 cell line, with the respective IC50 values of 0.112, 0.007 and 0.083 mu M, which were higher or comparable to those of the anticancer drug doxorubicin HCl. The binding constants of 5g and 7h to salmon fish sperm DNA were also evaluated using UV-vis absorption spectroscopy, indicating intercalation binding with constants of 1.05 x 10(6) L/mol and 4.84 x 10(6) L/mol. (C) 2014 Elsevier Masson SAS. All rights reserved.
Synthesis of indolo- and benzothieno[3,2-<i>c</i>]quinolines <i>via</i> POCl<sub>3</sub> mediated tandem cyclization of <i>o</i>-alkynylisocyanobenzenes derived from <i>o</i>-alkynyl-<i>N</i>-phenylformamides
A synthesis of indolo[3,2-c]quinolines and benzothieno[3,2-c]quinolines has been developed employing o-alkynyl-N-phenylformamide derivatives as the substrates. The reaction proceeded via a tandem process involving POCl3-assisted intramolecular cyclization of the firstly formed o-alkynylisocyanobenzenes, leading to the desired products in moderate to high yields. Furthermore, the reaction is efficient
使用邻炔基-N-苯基甲酰胺衍生物作为底物,开发了吲哚并[3,2- c ]喹啉和苯并噻吩并[3,2- c ]喹啉的合成方法。该反应通过串联过程进行,包括 POCl 3辅助的分子内环化首先形成的邻炔基异氰基苯,以中等至高产率产生所需的产物。此外,该反应在克级上是有效的,并且通过胺化、Suzuzki-Miyaura 反应和 Heck 交叉偶联对产物进行了结构修饰。几种选定吲哚的光物理性质[3,2- c] 喹啉通过紫外可见和荧光光谱进行了研究,并使用时间相关的 DFT 计算进行了合理化。