Manufacturing method of 2-hydroxy-5-phenylalkylaminobenzoic acid derivatives and their salts

摘要

The present invention provides an efficient method for mass-producing 2-hydroxy-5-(substituted)phenylalkylamino benzoic acid derivatives represented by specific Chemical formulas or their salts, particularly 2-hydroxy-5-[2-(4-trifluoromethylphenyl)ethylamino]benzoic acid or its salt.