Some fused heterocyclic compounds as eukaryotic topoisomerase II inhibitors.

Abstract:

:Our previously synthesized 37 compounds, which are 2,5,6-substituted benzoxazole, benzimidazole, benzothiazole, and oxazolo(4,5-b)pyridine derivatives, were tested for their eukaryotic DNA topoisomerase II inhibitory activity in cell free system and 28 were found to inhibit the topoisomerase II at an initial concentration of 100 microg/ml. After further testing at a lower range of concentrations, 12 derivatives, which were considered as positive topoisomerase inhibitors, exhibited IC50 values between 11.4 and 46.8 microM. Etoposide was used as the standard reference drug to compare the inhibitor activity. Among these compounds, 2-phenoxymethylbenzothiazole (3f), 6-nitro-2-(2-methoxyphenyl)benzoxazole (1a), 5-methylcarboxylate-2-phenylthiomethylbenzimidazole (3c), and 6-methyl-2-(2-nitrophenyl)benzoxazole (1c) were found to be more active than the reference drug etoposide. Present results point out that, besides the very well-known bi- and ter-benzimidazoles, compounds with single bicycle fused ring systems in their structure such as benzimidazole, benzoxazole, benzothiazole, and/or oxazolopyridine derivatives also exhibit significant topoisomerase II inhibitory activity.

authors

Pinar A,Yurdakul P,Yildiz I,Temiz-Arpaci O,Acan NL,Aki-Sener E,Yalcin I

doi

10.1016/j.bbrc.2004.03.093

subject

Has Abstract

pub_date

2004-04-30 00:00:00

pages

670-4

issue

2

eissn

0006-291X

issn

1090-2104

pii

S0006291X04005844

journal_volume

317

pub_type

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