Synthesis and antimalarial testing of neocryptolepine analogues: Addition of ester function in SAR study of 2,11-disubstituted indolo[2,3-b]quinolines
摘要:
This report describes the synthesis, and in vitro and in vivo antimalarial evaluations of certain ester-modified neocryptolepine (5-methyl-5H-indolo[2,3-b]quinoline) derivatives. The modifications were carried out by introducing ester groups at the C2 and/or C9 position on the neocryptolepine core and the terminal amino group of the 3-aminopropylamine substituents at the C11 position with a urea/thiourea unit. The antiplasmodial activities of our derivative agents against two different strains (CQS: NF54, and CQR: R1) and the cytotoxic activity against normal L6 cells were evaluated. The test results showed that the ester modified neocryptolepine derivatives have higher antiplasmodial activities against both strains and a low cytotoxic activity against normal cells. The best results were achieved by compounds 9c and 12b against the NF54 strain with the IC50/SI value as 2.27 nM/361 and 1.81 nM/321, respectively. While against R1 strain, all the tested compounds showed higher activity than the well-known antimalarial drug chloroquine. Furthermore, the compounds were tested for beta-haematin inhibition and 12 were found to be more active than chloroquine (IC50 = 18 mu M). Structure activity relationship studies exposed an interesting linear correlation between polar surface area of the molecule and beta-haematin inhibition for this series. In vivo testing of compounds 7 and 8a against NF54 strain on Plasmodium berghei female mice showed that the introduction of the ester group increased the antiplasmodial activity of the neocryptolepine core substantially. (C) 2013 Elsevier Masson SAS. All rights reserved.
摘要该研究文章描述了酯基对5-甲基-5 H-吲哚并[2,3- b ]喹啉(新隐油菜籽)衍生物的SAR研究中体外抗增殖活性的影响。从吲哚-3-羧酸酯和N开始合成C-2和/或C-9酯取代的新隐油松-带有酯基的甲基苯胺。在这些酯取代的新隐油松上,在C-11处进一步连接了多个氨基烷基氨基取代基,并通过改变C-11处的取代基以及A和/或D中酯基的位置进行了体外抗增殖测定新隐油环的环。结果表明,通过在C-9位引入酯取代基可以改善药物的抗增殖活性。其中,11-(3-氨基丙基氨基)-5-甲基-5 H-吲哚并[2,3 - b ]喹啉-9-羧酸酯(8b)是最有效的IC 50试剂。0.044μM对人白血病MV4-11细胞株的抗 还描述了药剂在癌细胞系和正常细胞系之间的选择性细胞毒性。二甲基11-(3-氨基丙基氨基)-5-甲基-5 H-吲哚并[2,3 - b ]喹啉-2,9-二羧酸盐(9a)对人结肠癌细胞系HCT