First enantioselective total synthesis of (−)-heliannuol C

The first, efficient total synthesis of (−)-heliannuol C (1) was accomplished enantioselectively, using a chemoenzymatic desymmetrization of the σ-symmetrical diol, a ring closing metathesis, a diastereoselective epoxidation, and a regioselective reductive cleavage of epoxide as the key reaction steps.