Synthesis 2009(18): 3162-3173  
DOI: 10.1055/s-0029-1216939
FEATUREARTICLE
© Georg Thieme Verlag Stuttgart ˙ New York

Synthesis of Dibromophakellin, Dibromophakellstatin, and Dibromo­agelaspongin via Oxidative Cyclization of Dihydrooroidin Derivatives

Ken S. Feldman*, Matthew D. Fodor, Amanda P. Skoumbourdis
Department of Chemistry, The Pennsylvania State University, University Park, PA 16802, USA
e-Mail: ksf@chem.psu.edu;
Further Information

Publication History

Received 1 July 2009
Publication Date:
14 August 2009 (online)

Abstract

A putative biosynthesis proposal for oroidin-derived marine alkaloids serves as a template for developing a biomimetic strategy for the syntheses of tetracyclic members of the phakellin family of sponge metabolites. Pummerer chemistry triggers the oxidative cyclization of the dihydrooroidin derivative, and dibromophakellin, dibromophakellstatin, and dibromoagelaspongin all can be accessed efficiently via this strategy.

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Hartree-Fock 6-31G**/MP2 calculations using Spartan 04 on the model systems i and ii.