alternative synthetic route toward a key intermediate in the total synthesis of isoschizogamine is described. The Claisen-Johnson rearrangement stereoselectively constructed a quaternary carbon. Trifluoroperacetic acid mediated the Baeyer-Villiger oxidation to form a bicycliclactone. The Mukaiyama-Matsuo protocol converted the lactone into an α,β-unsaturated lactone, that was used as the substrate for