Synthesis, antimicrobial activity and possible mechanism of action of 9-bromo-substituted indolizinoquinoline-5,12-dione derivatives
作者:Xi-Wei Wu、Zu-Ping Wu、Lu-Xia Wang、Hong-Bin Zhang、Jian-Wen Chen、Wei Zhang、Lian-Quan Gu、Zhi-Shu Huang、Lin-Kun An
DOI:10.1016/j.ejmech.2011.07.042
日期:2011.9
A series of 9-bromo-substituted indolizinoquinoline-5,12-dione derivatives was synthesized. Antimicrobial activity assessment indicates that compounds 1, 26, 27 and 28 exhibit strong activity against gram-positive bacterial strains, including Beta-hemolytic streptococcus CMCC32210, Staphylococcus aureus ATCC25923, Staphylococcus epidermidis ATCC12228, Enterococcus faecalis ATCC29212 and methicillin-resistant S. aureus ATCC43300 (MRSA). Compound 27 shows the best anti-MRSA activity with an MIC value of 0.031 mu g/ml. To assess the mechanism of action, the inhibitory activities of compound 1 against DNA gyrase and DNA topoisomerase IV were also measured. The results indicate that compound 1 has strong inhibitory effects on the Escherichia coli DNA gyrase supercoiling activity and S. aureus Topo IV relaxing activity. (C) 2011 Elsevier Masson SAS. All rights reserved.
Synthesis, cytotoxic activities and structure–activity relationships of topoisomerase I inhibitors: Indolizinoquinoline-5,12-dione derivatives
indolizinoquinoline-5,12-dione derivatives (IQDs) are synthesized and evaluated for their cytotoxicactivities toward human lung adenocarcinoma (GLC-82), large-cell lung carcinoma (NCI-H460), promyelocytic leukemia (HL-60) and breast carcinoma (MCF-7) cells by MTT method. Most of the IQDs show significant cytotoxic potency. In addition, the evaluation of structure-activityrelationships indicated that the incorporation