Online article for Non-subscribers

Pay per view

Heterocycles has a pay-per-view service for Non-subscribers.
You will be able to directly purchase the full text article through PayPal.
Your purchased Paper can be downloaded after the payment is completed.
An e-mail will be sent the URL to download the paper.
If you have any questions, please contact:

Price: ¥ 4,400 (Yen only)
Period: This Article can be accessed for 7 days.

Paper | Regular issue | Vol 57, No. 9, 2002, pp.1645-1651
Published online, 1st January, 1970
DOI: 10.3987/COM-02-9538
Synthesis of 5H-Benzo[b]carbazole-6,11-diones from Benzoylindolecarboxylic Acids

Yasuyoshi Miki,* Yasuhiko Tsuzaki, and Hana Matsukida

*Faculty of Pharmaceutical Sciences, Kinki University, 3-4-1, Kowakae, Higashi-Osaka 577-8502, Japan


Treatment of 1-benzyl-3-(4-methoxybenzoyl)indole-2-carboxylic acid with phosphorus pentachloride gave the corresponding acid chloride, which was treated with titanium(IV) chloride to afford 9-methoxy-5H-benzo[b]carbazole-6,11-dione. In a similar manner, 1-benzenesulfonyl-2-(4-methoxybenzoyl)indole-3-carboxylic acid provided 9-methoxy-5H-benzo[b]carbazole-6,11-dione. However, 1-benzyl-3-(4-methoxybenzyl)indole-2-carboxylic acid could be converted to 8-methoxy-5H-benzo[b]carbazole-6,11-dione.