Abstract:Mitragynine pseudoindoxyl, a kratom metabolite, has attracted increasing attention due to its favorable side effect profile as compared to conventional opioids. Herein, we describe the first enantioselective and scalable total synthesis of this natural product and its epimeric congener, speciogynine pseudoindoxyl. The characteristic spiro‐5‐5‐6‐tricyclic system of these alkaloids was formed through a protecting‐group‐free cascade relay process in which oxidized tryptamine and secologanin analogues were used. F… Show more
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