(57) The present invention provides a method for introducing substituents into the α-position and the β-position of an α,β-unsaturated ketone, which not only can be used for the synthesis of a prostaglandin by a three-component coupling process, but also enables synthesis of a prostaglandin in a high yield by one-pot operation without requiring the use of a large excess amount of any of the three components required for the synthesis or using a highly toxic heavy metal as a catalyst or a solvent that is highly toxic to living bodies, and a method for synthesizing a prostaglandin using the same technical means..
The method for introducing substituents into an α,β-unsaturated ketone according to the present invention is a method for introducing substituents into the carbon at the α-position and the carbon at the β-position of an α,β-unsaturated ketone, including: a first step of mixing alkyllithium and trialkylalkenyl tin in which tin atom binds to the vinyl position of the alkenyl group; a second step of mixing the mixture of the first step and dialkylzinc; a third step of mixing the mixture of the second step and an α,β-unsaturated ketone; and a fourth step of mixing the mixture of the third step and a trifluoromethanesulfonate compound.