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 for the process

摘要

Disclosed is a production process using, as an intermediate, a 6-(halomethyl)-1,2-benzisooxazol-3(2H)-one derivative represented by the general formula: Wherein R<5> represents a methyl group substituted by at least one phenyl group which may be substituted, or an oxygenated heterocyclic ring which may be substituted; and X represents a halogen atom. The process is useful for the production of 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, in a high yield and in a safe and simple manner.