Process for production of 3-5-4-(cyclopentyloxy)-2-hydroxybenzoyl-2-(3-oxo-2-substituted-2,3-dihydro-1,2-benzisoxazol-6-yl)methoxyphenylpropionate ester and intermediate for the process

摘要

A preparation method using as an intermediate 6-(halomethyl)-1,2-benzisoxazol-3(2H)-one derivative represented by general formula wherein R 5 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.