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Ciguatoxins, the principal causative agents of ciguatera seafood poisoning, are extremely large polycyclic ethers. We report herein a reliable route for constructing the left wing of CTX1B, which possesses the acid/base/oxidant‐sensitive bisallylic ether moiety, by a 6‐ exo radical cyclization/ring‐closing metathesis strategy. This new route enabled us to achieve the second‐generation total synthesis of CTX1B and the first synthesis of 54‐deoxyCTX1B.
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Yamashita et al. (2014) studied this question.
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