Synthesis and Toxicity of New Ring-Fused Imidazo[5,4-f]benzimidazolequinones and Mechanism Using Amine N-Oxide Cyclizations
作者:Vincent Fagan、Sarah Bonham、Patrick McArdle、Michael P. Carty、Fawaz Aldabbagh
DOI:10.1002/ejoc.201101687
日期:2012.4
hydrogen-bonded amineN-oxide intermediate. The amineN-oxide is shown to act as an oxidant in the aromatisation to the imidazole ring. X-ray crystal structures of the dimorpholine N-oxide intermediate and bis[1,4]oxazinoimidazo[5,4-f]benzimidazolequinone bis(trifluoroacetate) adduct are included. Two unsymmetrical quinones are shown to have greater cytotoxicity than the previously reported imidazobenzimidazolequinones