Asymmetric Total Synthesis of Attenol A and B

The asymmetric total synthesis of attenol A (1) and B (2), which possess challenging structures and an interesting biological activity, was accomplished in a convergent and highly stereo­selective manner (de, ee ≥ 96%) with good overall yield. The short total synthesis is based on asymmetric alkylations of SAMP-hydrazones as well as a Sharpless asymmetric dihydroxylation as key steps.