| abstract |
(57) [Summary] (Modified) [Objective] To provide a method for producing a benzylsuccinic acid derivative having a hypoglycemic action and useful as a diabetes drug, and an intermediate for producing the same. A method for producing a benzylsuccinic acid derivative represented by the formula (I) by hydrolyzing a benzylsuccinic acid derivative represented by the formula (IV), and a benzylsuccinic acid derivative of the formula (IV) as a starting material Acid derivative. [In the formula, A is an ethylene group, a trimethylene group, an O-phenylene group or a bicyclo [2,2,1] hept-5-ene-2,3-diyl group, and the arrangement of the carbon atoms with (S) Is the S arrangement] |