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A novel and potent hemagglutinin inhibitor, (+)‐stachyflin, was efficiently synthesized in an enantioselective manner starting from the (+)‐5‐methyl‐Wieland–Miescher ketone. The synthetic method features a BF3·Et2O‐induced cascade epoxide‐opening/rearrangement/cyclization reaction tostereoselectively construct the requisite pentacyclic ring system in one step. In order to rationalize the mechanism...
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