Asymmetric Total Synthesis of Laurallene.

The asymmetric total synthesis of laurallene was achieved in 13 steps for the longest linear sequence with 3.3% overall yield from commercially available trans-2-pentenal. This synthesis features the highly efficient construction of a branched ether system with five oxygenated asymmetric stereocenters by the combination of a palladium-catalyzed alkoxy substitution reaction and a cobalt-catalyzed Mukaiyama oxidative cyclization.