PROCESS FOR PRODUCTION OF 3-[5-[4-(CYCLOPENTYLOXY)-2-HYDROXYBENZOYL]-2-[(3-OXO-2-SUBSTITUTED-2,3-DIHYDRO-1,2-BENZISOXAZOL-6-YL)METHOXY]PHENYL]PROPIONATE ESTER AND INTERMEDIATE FORTHE PROCESS

摘要

A preparation method using as an intermediate 6-(halomethyl)-1,2-benzisoxazol-3(2H)-one derivative represented by general formula (see above formula) wherein R5 is a methyl group that is substituted with one or more optionally substituted phenyl groups, or an optionally substituted oxygen-containing heterocyclic group; X represents a halogen atom, can be used as a method for safely and easily preparing 3-{5-[4-(cyclopentyloxy)-2-hydroxybenzoyl]-2-[(3-hydroxy-1,2-benzisoxazol-6-yl)methoxy]phenyl}propionic acid, which is useful as an antirheumatic agent, with a high yield.