Asymmetric nucleophilic epoxidation
Nucleophilic epoxidation is the formation of epoxides from electron-deficient double bonds through the action of nucleophilic oxidants. Nucleophilic epoxidation methods represent a viable alternative to electrophilic methods, many of which do not epoxidize electron-poor double bonds efficiently.
Source: Wikipedia — Asymmetric nucleophilic epoxidation (CC BY-SA 4.0)