Synthesis of novel 2H,5H-dihydrofuran-3-yl ketones via ISNC reactions

Novel 1-[2H,5H-dihydrofur-3-yl] ketones have been prepared from propargylic nitroethers via an intramolecular cycloaddition utilizing silyl nitronates in modest to excellent yields. CAChe MNDO PM5 and CONFLEX programs were employed to aid in assigning the stereochemistry.