1,3-Dipolar Cycloaddition of Nitrones with Electron-richAlkenes Catalyzed by Yb(OTf)3

摘要

1,3-Dipolar cycloaddition of nitrones with ethyl vinyl ether or 2, 3-dihydrofuran proceeds smoothly in the presence of a catalytic amount (10 mol% ) of ytterbium triflate to afford isoxazolidines and dicyclic isoxazolidine respectively with good yields ahd high stereoselectivity.