Abstract
A novel radical-based strategy for accessing the unique tetracyclic skeleton of resiniferatoxin is described. The synthetic route is characterized by a stereoselective synthesis of the C-ring which has a bridgehead O,Se–acetal, a three component radical coupling of the A- and C-rings and a branched allyl stannane, and a 7-endo radical cyclization to construct the fused B-ring from the coupling adduct. The present approach attests to the power of radical reactions to realize the congested C–C bond formations required for synthesizing highly functionalized compounds.
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