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Communication | Regular issue | Vol 45, No. 9, 1997, pp.1647-1650
Published online, 1st January, 1970
DOI: 10.3987/COM-97-7848
The First Syntheses of Antiviral, Cytotoxic 6-Cyano-5-methoxy- and -12-methylindolo[2,3-a]carbazoles, and Related Indolo[2,3-a]carbazoles from Indigo

Hiroyuki Hayashi, Shinobu Ohmoto, and Masanori Somei*

*Faculty of Pharmaceutical Scicences, Kanazawa University, 13-1 Takara-machi, Kanazawa 920-0934, Japan

Abstract

The first simple total syntheses of 6-cyano-5-methoxy- (1a) and -12-methylindolo[2,3-a]carbazole (1b) are attained from indigo (2) in only five and six steps, respectively. Preparations of 5-hydroxy- (13), 5-bromoindolo[2,3-a]carbazole (14), and a novel spiro compound (7) are also included.