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Asymmetric epoxidation reactions of chalcone derivatives catalyzed by chiral calcium complexes using hydrogen peroxide were developed. The epoxidation reactions proceeded smoothly to afford the desired products in good yields with good enantioselectivities. This is the first example of chiral calcium-catalyzed asymmetric epoxidation reactions using hydrogen peroxide as the terminal oxidant.

Chiral Calcium-Catalyzed Asymmetric Epoxidation Reactions Using Hydrogen Peroxide as the Terminal Oxidant