One-pot double intramolecular homolytic aromatic substitution routes to dialicyclic ring fused imidazobenzimidazolequinones and preliminary analysis of anticancer activity
作者:Vincent Fagan、Sarah Bonham、Michael P. Carty、Fawaz Aldabbagh
DOI:10.1039/c003511d
日期:——
Bu3SnH/1,1′-azobis(cyclohexanecarbonitrile) (ACN)-mediated five, six, and seven-membered double alkyl radical cyclizations onto imidazo[5,4-f]benzimidazole and imidazo[4,5-f]benzimidazole are described. The quinone derivatives evaluated show selective toxicity towards human cervical (HeLa) and prostate (DU145) cancer cell lines (with negligible toxicity towards a normal human cell line, GM00637). Only the Fremy oxidation of the 6-aminoimidazo[5,4-f]benzimidazole gave iminoquinone, which showed high specificity towards the prostate cancer cell line (DU145).
Inhibitors of Topoisomerase II Based on the Benzodiimidazole and Dipyrroloimidazobenzimidazole Ring Systems: Controlling DT-Diaphorase Reductive Inactivation with Steric Bulk
作者:William G. Schulz、Edward B. Skibo
DOI:10.1021/jm990210q
日期:2000.2.1
inhibitors of topoisomeraseII. Both quinone systems exhibit cytotoxicity perhaps due to the lack of inactivation by DT-diaphorase as well as topoisomeraseIIinhibition. One quinone displayed the novel feature of cytotoxicity selectively against melanoma cell lines. In conclusion, the benzodiimidazole and dipyrroloimidazobenzimidazole quinone ring systems will be subjected to future analogue development