Synthesis, Table of Contents PAPER © Georg Thieme Verlag Stuttgart · New York Synthesis of Indolo[2,3-a]pyrrolo[3,4-c]carbazoles by Oxidative Cyclization of Bisindolylmaleimides with a Rhodium(III)-Copper(II) Catalytic System Bernhard Witulski*, Torsten SchweikertWestfälische Wilhelms-Universität Münster, Organisch-Chemisches Institut, Correnstr. 40, 48143 Münster, GermanyFax: +49(251)8336501; e-Mail: witulski@uni-muenster.de; Recommend Article Abstract Buy Article All articles of this category Abstract A novel catalytic protocol for the synthesis of a series of indolo[2,3-a]pyrrolo[3,4-c]carbazoles based on the bimetallic system RhCl3·3H2O and Cu(OAc)2·H2O in the presence of molecular oxygen was investigated. The method was applied to the synthesis of the glycosidated fluoroindolocarbazole 3 that was recently isolated as a metabolite from feeding experiments of Saccharothrix aerocolonigenes ATCC 39243 with fluorotryptophanes. 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Soc., Perkin Trans. 1 2000, 2609 29 When this manuscript was in preparation, we became aware of a recent report on the design, synthesis and biological evaluation of a set of fluoroindolocarbazole glycosides including compound 3 as very selective topoisomerase I active agents. However, no experimental details were given: Balasubramanian BN. St. Laurent DR. Saulnier MG. Long BH. Bachand C. Beaulieu F. Clarke W. Deshpande M. Eummer J. Fairchild CR. Frennesson DB. Kramer R. Lee FY. Mahler M. Martel A. Naidu BN. Rose WC. Russell J. Ruediger E. Solomon C. Stoffan KM. Wong H. Zimmermann K. Vyas DM. J. Med. Chem. 2004, 47: 1609