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Synthesis and properties of imidazolo-fused benzotriazinyl radicals

Berezin, Andrey A., Constantinides, Christos P., Mirallai, Styliana I., Manoli, Maria, Cao, Levy L., Rawson, Jeremy M. and Koutentis, Panayiotis A. 2013. Synthesis and properties of imidazolo-fused benzotriazinyl radicals. Organic and Biomolecular Chemistry 11 (39) , pp. 6780-6864. 10.1039/c3ob41169a

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1,3-Diphenylbenzo[e][1,2,4]triazin-7(1H)-one, the oxidation product of 1,3-diphenyl-1,4-dihydro-1,2,4-benzotriazin-4-yl (Blatter's radical), reacts with N′-arylbenzamidines in PhMe at ca. 100 °C in the presence of N,N-diisopropylethylamine (Hünig's base) (1 equiv.) to give N′-aryl-N-(1,7-dihydro-7-oxo-1,3-diphenylbenzo[e][1,2,4]triazin-6-yl)benzimidamides in 49–95% yield. In neat AcOH heated at ca. 120 °C, N′–aryl-N-(1,7-dihydro-7-oxo-1,3-diphenylbenzo[e][1,2,4]triazin-6-yl)benzimidamides cyclodehydrate to give the novel 8-substituted 1,3,7-triphenyl-4,8-dihydro-1H-imidazo[4,5-g][1,2,4]benzotriazin-4-yls in 13–81% yield. During the optimization of this cyclodehydration an additional oxazole fused benzotriazinyl radical 1,3,7-triphenyl-1,4-dihydro[1,3]oxazolo[4,5-g][1,2,4]benzotriazin-4-yl was isolated as a side product and characterized. The CV and EPR data of the imidazolo- and oxazolo-fused radicals are presented as well as single crystal X-ray structures of 1,3,7-triphenyl-1,4-dihydro-[1,3]oxazolo[4,5-g][1,2,4]benzotriazin-4-yl and 1,3,7,8-tetraphenyl-4,8-dihydro-1H-imidazo[4,5-g][1,2,4]benzotriazin-4-yl.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Publisher: Royal Society of Chemistry
ISSN: 1477-0520
Date of Acceptance: 12 August 2013
Last Modified: 20 Jan 2020 15:00

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