Facial selectivity induced by N-aryl atropisomerism in benzonitrile oxide cycloadditions with 4-methylene-2-oxazolidinones
作者:Sarah L. Harding、G. Paul Savage
DOI:10.1039/c2ob25271f
日期:——
4-methylene-2-oxazolidinones, prepared via the corresponding O-propargyl carbamates, underwent nitrile oxidecycloaddition with benzonitrileoxide to give 5-spiro isoxazoline adducts with complete regioselectivity. Steric hindrance by atropisomerism around the N-aryl bond induced facial selectivity in these cycloadditions.