Synthesis of Fused Tetrahydrofuran‐γ‐lactone Motifs via One‐Pot Ring Expansion of Cyclopropane Rings
摘要:
An efficient method for constructing fused tetrahydrofuran-gamma-Iactone scaffolds, such as 8, is presented. Key to this strategy is an acid-catalyzed ring expansion of cyclopropyl precursor 6 that proceeds in the presence of MeSO3H in acetone and produces the desired bicyclic system in good to excellent yields.