The Total Synthesis of (¨C)-Scabrolide a

The first total synthesis of the norcembranoid diterpenoid scabrolide A is disclosed. The route begins with the synthesis of two chiral pool-derived fragments, which undergo a convergent coupling to expediently introduce all 19 carbon atoms of the natural product. An intramolecular Diels¨CAlder reaction and an enone-olefin cycloaddition/fragmentation sequence are then employed to construct the fused [5¨C6¨C7] linear carbocyclic core of the molecule and to complete the total synthesis.