Total Synthesis of Sandresolide B and Amphilectolide

Abstract

The total synthesis of the diterpenoids sandresolide B and amphilectolide from a common furan building block is presented. Key steps include palladium-mediated carbonylation, lanthanide catalyzed ring closure, Myers alkylation, intramolecular Friedel–Crafts acylation, photooxygenation, and a Kornblum–DeLaMare rearrangement