Stereocontrolled Synthesis of the Highly Functionalized Core Structure of Aurisides by Ring-Closing Metathesis

Two approaches based on the ring-closing metathesis reaction have been explored for the synthesis of the core structure of the marine natural products, the aurisides. The second approach, accomplished in a stereocontrolled manner, used both a Brown's allylation and an Evans' aldolisation, and finally a transannular ketalization to deliver a highly functionalized auriside analogue.