Peroxydicarbonate-mediated oxidation of N-(ortho-aryloxyphenyl) and N-(ortho-arylaminophenyl)aldimines
作者:Rino Leardini、Hamish McNab、Daniele Nanni
DOI:10.1016/0040-4020(95)00769-5
日期:1995.10
the methyl group: this process entails the formation of carbamoyl radicals, which cyclise onto the carbon-nitrogen double bond, furnishing quinoxalinone derivatives, or loose carbonmonoxide to yield benzimidazoles through ring closure of aminyl radicals. A novel cyclisation of a nitrogen-centred radical onto a formamido group could account for the formation of a benzimidazolinone derivative.
Imidoyl radicals 4a-d, obtained by hydrogen abstraction from imines 1a-d, give 7-membered cyclisation leading to oxazapines 2a-d. The intermediate spirocyclohexadienyl radicals of the competitive 6-membered ring closure (6a-d) rearrange to aryloxy radicals, giving benzophenones 3a-d: the whole process entails a novel 1,5-aryl radical translocation from an oxygen to a carbon atom.