PROCESS FOR PREPARATION OF SUBSTITUTED 3'-HYDRAZINO-BIPHENYL-3-CARBOXYLIC ACID COMPOUNDS

摘要

The present invention provides a process for the preparation of substituted 3′-hydrazino-biphenyl-3-carboxylic acid compounds. The present invention further provides a process for the preparation of 3′-{N′-[1-(3,4-dimethylphenyl)-3-methyl-5-oxo-1,5-dihydro-pyrazol-4-ylidene]hydrazino}-2′-hydroxybiphenyl-3-carboxylic acid, its intermediate compounds and pharmaceutically acceptable salts thereof.