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Communication | Regular issue | Vol 34, No. 7, 1992, pp.1285-1288
Published online, 1st January, 1970
DOI: 10.3987/COM-92-6044
A Novel Synthesis of 2,2’-Bisindole and Its Application for the Synthesis of Indolo[2,3-a]carbazole Derivatives

Masanori Somei* and Atsushi Kodama

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


A novel oxidative coupling method of 2-lithio-1-methoxyindole was developed resulting in the formation of 2,2’-bis(1-methoxyindole) (6). Catalytic hydrogenation of 6 produced 2,2’-bisindole (9). Diels-Alder reaction of 9 with dienophiles afforded indolo[2,3-a]carbazole derivatives.