| abstract |
(57) [Problem] To provide a method for producing an optically active compound using an asymmetric phase transfer catalyst which is easy to prepare. The present invention provides, as an asymmetric phase transfer catalyst, the following cinchonium salt (I): Asymmetric epoxidation of α, β-unsaturated ketone in a heterogeneous mixed solvent system of an aqueous phase and an organic phase containing an alkali metal hydroxide, using hydrogen peroxide as an oxidizing agent in the presence of a catalytic amount of Provided is a method for producing an optically active carbonyl compound, which comprises a step of obtaining an optically active α, β-epoxy ketone. |