Synthetic studies toward the Lycopodium alkaloid nankakurine A

ORGN 750

Ellen D. Beaulieu, ledowns@berkeley.edu, Juliette R. Petersen, and Dirk Trauner, trauner@berkeley.edu. Department of Chemistry, University of California, Berkeley, Room B84 Hildebrand Hall, University of California, Berkeley, CA 94720
Nankakurine A is a tetracyclic alkaloid isolated from the club moss Lycopodium hamiltonii whose structure was elucidated in 2004. The natural product features a 3-aza-bicyclo[3.3.1]nonane ring system fused to a piperidine ring through a spiro center. Our synthesis utilizes a formal aza-ene cyclization to rapidly access the tricyclic core. A systematic investigation of hydroamination methods to construct the spiro piperidine ring is also detailed.