Synthesis of azapyrrolo[3,2,1-jk]carbazoles, azaindolo[3,2,1-jk]carbazoles, and carbazole-1-carbonitriles by gas-phase cyclization of aryl radicals

Article abstract of DOI:10.1055/s-0029-1218634

Flash vacuum pyrolysis of N-(2-nitroheteroaryl)indoles or-carbazoles at 875C gave aza analogues of strained pyrrolo[3,2,1-jk]carbazole (50-55%) and indolo[3,2,1-jk]carbazole (55-85%) ring systems, respectively, through generation of aryl radicals and cycl