Diastereoselective Epoxidation of N-Enoylsultams with Different Chiral Sultams as Auxiliaries

Asymmetric epoxidation of N-enoylsultams (1, 3–15) incorporating a variety of chiral sultams as the chiral induction elements with UHP/TFAA has been studied. Both diastereomeric isomers of epoxides (2, 16–28) were obtained in high yield and moderate to high optical purity.