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DOI: 10.1055/s-2004-817767
Total Synthesis of Ciguatoxin CTX3C, a Causative Toxin of Ciguatera Seafood Poisoning
Publication History
Publication Date:
10 February 2004 (online)
Abstract
More than 20,000 people suffer annually from ciguatera seafood poisoning in subtropical and tropical regions. The extremely low content of the causative neurotoxins, designated as ciguatoxins, in fish has hampered the isolation, detailed biological studies, and preparation of anti-ciguatoxin antibodies for detecting these toxins. Furthermore, the large (3 nanometer long) and complicated molecular structure of ciguatoxins has impeded chemists from completing their total synthesis. In 2001, our highly convergent strategic approach enabled the total synthesis of ciguatoxin CTX3C through assembling the four structural fragments. In this account, we describe the updated version of the total synthesis, where the yields and practicality are greatly improved. The high efficiency of the present synthesis ensures a supply of ciguatoxins for biomedical applications.
Key words
convergent synthesis - ring-closing olefin metathesis - CTX3C - polyether - ciguatera - ciguatoxin
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References
The numbering of carbon atoms in all compounds in this paper corresponds to that of CTX3C.
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67See ref. 65. The authors noted that the cleavage of a seven-membered acetal proceeded more easily than a six-membered acetal in a Lewis acid-catalyzed intramolecular condensation of a γ-alkoxyallylsilane.
74Deprotection of Bn group under Birch conditions were applied to the AB ring system 24 to afford the desired compound 25 in much better yield (>59%, Scheme [2] ), which again support the distinct reactivity of the nano-scale molecule 140