Insights into the Synthesis of SteroidalA-Ring Olefins

A stereospecific total synthesis of DL-hexahydroapoerysopine

A stereospecific total synthesis of DL-hexahydroapoerysopine, an intriguing and historically important Apo rearrangement product of the aromatic Erythrina alkaloids bearing the all-cis ring fusion stereochemistry, was achieved via an efficient acid-mediated stereospecific skeletal rearrangement.