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Prof. Dr. Xianxiu Xu, Lingjuan Zhang, Xiqing Liu, Dr. Ling Pan and Prof. Dr. Qun Liu Facile [7C+1C] Annulation as an Efficient Route to Tricyclic Indolizidine Alkaloids Angewandte Chemie International Edition 52

Version of Record online: 2 JUL 2013 | DOI: 10.1002/anie.201303604

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A handle on annulation: The two alkenoyl moieties of the cyclic dithiolane are parallel to each other and enables the [7C+1C] annulation with ethyl isocyanoacetate to occur. As a result, tricyclic indolizidine alkaloids are constructed by a two-step, base-catalyzed [7C+1C] annulation/intramolecular cyclization with subsequent reduction/cyclization.

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