Efficient Synthesis of Marine Polycyclic Ethers

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In recent years there has been an explosion of interest in biologically active natural products of marine origin. Due to their structural novelty and toxicity, polycyclic ethers isolated from marine algae are particularly attractive targets for synthetic chemists. Since further biological studies are hampered by the limited availability from nature, chemical synthesis has been the sole realistic way to obtain sufficient amounts of the polycyclic ethers. In this study, convergent synthesis of brevenal and ciguatoxin CTX3C via the intramolecular allyaltion followed by ring-closing metathesis were examined.