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The synthesis of the ABCDEF-ring of ciguatoxin 3C was achieved via a route that included anion coupling of a dimethyldithioacetal mono-S-oxide derivative corresponding to the AB-ring and an aldehyde corresponding to the EF-ring, followed by cyclization using reductive etherification. The AB-ring was synthesized from a known d-glucose derivative based on ring-closing olefin metathesis, and the EF-ring...
Convergent synthesis of the ABCDE-ring part (2) of ciguatoxin CTX3C (1) has been achieved. A carbanion stabilized by a dimethyldithioacetal S-oxide group in the AB-ring part (4) readily reacted with an aldehyde group in the E-ring part (5). The resulting adduct was facilely converted to the corresponding β,γ-unsaturated α,ε-dihydroxy ketone (3). The subsequent reductive hydroxy-ketone-cyclization...
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