Patent ID: 7038056

Claim:
A method for preparing a 7-quinolinyl-3,5-dihydroxyhept-6-enoate represented by the formula (IV): (wherein R represents an alkyl group or an aryl group), characterized in that a compound represented by the formula (I): (wherein R is as defined above), or a compound represented by the formula (II): (wherein R is as defined above), is reduced by sodium borohydride in a reaction solvent in the presence of a boron compound represented by the formula (III): R′OBR″ 2 (III) (wherein R′ and R″ represent independently an alkyl group), the reaction solvent is removed, and then the resultant reaction mixture is treated with an aqueous solution of hydrogen peroxide in the presence of an inorganic base in a two phase system with an organic solvent with separates from water.