Total syntheses of riccardins A, B, and C, cytotoxic macrocyclic bis(bibenzyls) from liverworts

Agnes Gottsegen, Mihály Nógrádi, Borbála Vermes, Mária Kajtár-Peredy, Éva Bihátsi-Karsai

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Di-O-methylriccardin A (3), riccardin A (1), and riccardin B (4) were synthesized by convergent schemes. Rings A and D of both riccardin A and B, as well as rings B and c of riccardin B were joined by the Ullmann ether synthesis. The aryl-aryl bond in riccardin A was established by Ni(0)-assisted intramolecular coupling of a di-iodoester (17). Rings A and B were linked in all syntheses by the Wittig reaction, whereas ring closure was effected by a tetraphenylethene catalyzed Wurtz reaction. Demethylation of (3) gave riccardin C (2).

Original languageEnglish
Pages (from-to)315-320
Number of pages6
JournalJournal of the Chemical Society, Perkin Transactions 1
Issue number2
Publication statusPublished - Dec 1 1990


ASJC Scopus subject areas

  • Chemistry(all)

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