Abstract
Abstract Magnesium ion-mediated cycloaddition reactions of nitrile oxides to chiral 3-acryloyl-2-oxazolidinones lead to highly diastereoselective formation of 2-isoxazolines. The magnesium ion serves to fix the α,β-unsaturated moiety through chelation to effect chiral shielding. These asymmetric reactions provide the first successful examples of Lewis acid-mediated stereocontrol of nitrile oxide cycloaddition reactions to electron-deficient dipolarophiles.
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