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  • Title: Total synthesis of (±)-dragmacidin E.
    Author: Feldman KS, Ngernmeesri P.
    Journal: Org Lett; 2011 Oct 21; 13(20):5704-7. PubMed ID: 21958431.
    Abstract:
    The bis indole sponge alkaloid dragmacidin E was synthesized in racemic form over 25 steps starting from 7-benzhydroxyindole. Key steps include (a) a Witkop cyclization to facilitate construction of the indole-spanning seven-membered ring and (b) a cyclodehydrative pyrazinone synthesis that unites the two indole-containing sectors.
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