title: Biradicals/zwitterions from enallene-isonitriles. Formal [4 + 1] cycloadditions leading to 11H-indeno[1,2-b]quinoline and related compounds.
abstract: [reaction: see text] 1,3-Prototropic rearrangement of the benzannulated enyne-isonitriles to the corresponding enallene-isonitriles followed by cycloaromatization generated the putative quinoline biradicals/zwitterions. A subsequent intramolecular radical-radical coupling or electrophilic aromatic substitution then gave the formal [4 + 1] cycloaddition adducts leading to 11H-indeno[1,2-b]quinoline and related compounds.
authors.affiliation: Department of Chemistry, West Virginia University, Morgantown, West Virginia 26506-6045, USA.
authors.forename: Xiaoling
authors.initials: X
authors.lastname: Lu
authors.forename: Jeffrey L
authors.initials: JL
authors.lastname: Petersen
authors.forename: Kung K
authors.initials: KK
authors.lastname: Wang