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The highly functionalized THF 4 was prepared in eight steps from 2,5-cyclooctadiene. The key step in this synthesis was a novel desymmetrization reaction involving the iodoetherification of the C2 symmetric bis-isopropylidene alkene 6 to THF 4. The versatility of 4 was demonstrated by its conversion to bis-THF 3, a known precursor for trilobacin, and to the tris-THF-lactone 5, a potential relay compound...
The iodoetherification of C6 allyllated 2,3-dideoxypyranosides has been shown to give cis-2,5-disubstituted tetrahydrofurans in high stereoselectivity. This result is applied to a modular synthesis of the bis-THF core of the acetogenin, rolliniastatin.
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