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A Unified Strategy For The Synthesis Of 7-membered-ring-containing Lycopodium Alkaloids.

Amy S. Lee, Brian B Liau, M. D. Shair
Published 2014 · Chemistry, Medicine

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A unique subset of the Lycopodium alkaloid natural products share a 7-membered-ring substructure and may potentially arise from a common biosynthetic precursor. To both explore and exploit these structural relationships, we sought to develop a unified biosynthetically inspired strategy to efficiently access these complex polycyclic alkaloids through the use of a cascade sequence. In pursuit of these goals, the first total synthesis of (+)-fastigiatine (2) was accomplished via a series of cascade reactions; we describe herein a full account of our efforts. Insight from these endeavors led to critical modifications of our synthetic strategy, which enabled the first total syntheses of (-)-himeradine A (1), (-)-lycopecurine (3), and (-)-dehydrolycopecurine (4), as well as the syntheses of (+)-lyconadin A (5) and (-)-lyconadin B (6). Our approach features a diastereoselective one-pot sequence for constructing the common 7-membered-ring core system, followed by either a biomimetic transannular Mannich reaction to access himeradine A (1), lycopecurine (3), and dehydrolycopecurine (4) or an imine reduction for lyconadins A (5) and B (6). This strategy may potentially enable access to all 7-membered-ring-containing Lycopodium alkaloids and provides additional insight into their biosynthetic origin.
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