Indoles are the main products from the cyslisation of (2,6-dimethylpheneyl)-1,4-diazabuta-1,3-dienyl radicals, together with small amounts of quinoxalines; both ring systems arise predominantly via an intermediate spirodienyl radical.
H. McNab and G. S. Smith, J. Chem. Soc., Chem. Commun., 1982, 996 DOI: 10.1039/C39820000996
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