Synthesis of the Tricyclic Core of Alkaloid Securinol B Using a Cascade of Vilsmeier-Haack and Mannich Cyclizations.

[摘要]：Iminium ions generated upon amide activation were trapped sequentially with tethered nucleophiles. This cascade of cyclizations constitutes a new synthetic strategy that was applied to the construction of the tricyclic core (I) of alkaloid securinol B.

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