Optimized Asymmetric Synthesis of Umuravumbolide.

Herein, the asymmetric synthesis of umuravumbolide () is described. The new approach features highly stereoselective transformations (dr ≥ 95:5) to install both stereocenters and the olefin, which involve a new radical alkylation, an Ando olefination, and a Krische allylation on a allylic alcohol, not reported before. The application of such successful reactions, together with the limited use of protecting groups and concession steps, makes it possible to complete the synthesis in 10 steps, resulting in a 39% overall yield from chiral -acyl oxazolidinone .