A total synthesis of (±)-stemarin, a diterpenoid with a unique bicyclic C/D ring System

Abstract
A total synthesis of (±)-stemarin, a diterpenoid with a unique C/D ring System, is described. The synthesis features photoaddition of allene to an α,β-unsaturated ketone and two skeletal rearrangements. Application of the synthetic strategy described herein to a synthesis of stemodinol and aphidicolin is anticipated.

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