A method for preparing a 7-quinolynyl-3,5-dihydroxyhept-6-enoate useful as an intermediate for pharmaceuticals, in high yield and in high purity, is presented. It is a method for preparing a 7-quinolinyl-3,5-dihydroxyhept-6-enoate represented by the formula (IV): ##STR1##

(wherein R represents an alkyl group or an aryl group), characterized in that a compound represented by the formula (I): ##STR2##

(wherein R is as defined above), or a compound represented by the formula (II): ##STR3##

(wherein R is as defined above), is reduced by sodium borohydride in the presence of a boron compound represented by the formula (III):

ROBR"2  (III)

(wherein R and R" represent independently an alkyl group), and then the resultant reaction mixture is treated with an aqueous solution of hydrogen peroxide.

 
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