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Communication | Regular issue | Vol 41, No. 10, 1995, pp.2161-2164
Published online, 1st January, 1970
DOI: 10.3987/COM-95-7192
Simple Synthesis of 2,2'-Bisindole from Indigo and Its Application for the Syntheses of Indolo[2,3-a]pyrrolo[3,4-c]carbazole-5,7-(6H)dione and -5-(6H)one Derivatives

Masanori Somei,* Hiroyuki Hayashi, Tohru Izumi, and Shinobu Ohmoto

*Faculty of Pharmaceutical Scicences, Kanazawa University, 13-1 Takara-machi, Kanazawa 920, Japan


Indiogo was converted to 2,2’-bisindole, from which 6-substituted indolo[2,3-a]pyrrolo[3,4-c]carbazole-5,7-(6H)dione and -5-(6H)one derivatives were prepared in short steps. Bromination of 6-methylindolo[2,3-a]pyrrolo[3,4-c]carbazole-5,7-(6H)dione is also reported.