ChemInform Abstract: N-(β,β-Difluorovinyl)oxazolidin-2-ones: First Synthesis and Application in [3 + 2]- and [4 + 2]-Cycloaddition-Type Reactions

N-(β,β-Difluorovinyl)oxazolidin-2-ones were conveniently prepared in good yields in two steps from the parent oxazo-lidin-2-ones. The [3+2]- and [4+2]-cycloaddition-type reactions with electron-deficient partners were investigated as first application of these new enamides. TMSOTf was efficient in promoting these two reactions, and the corresponding heterocyclic difluoro adducts were obtained in high yields.