Preparation of 1-amino-4 2-(substituted amino) methyl-4-methyl-6-sulfophenyl amino-9,10-dihydro-9,10-dioxo-2-anthracenesulfonic acid

摘要

The present invention relates to a process for the preparation of the sodium salt of 1-amino-9,10-dihydro-4-[(4-methylphenyl) amino]-9,10-dioxo-2-anthracenesulfonic acid represented by the following structural formula Amino-4-[[2-(substituted (meth) acrylate] represented by the following general formula (I), which is characterized in that it is reacted with a hydroxymethylamide derivative represented by the following general formula Amino) methyl-4-methyl-6-sulfophenyl] amino]-9,10-dihydro-9,10-dioxo-2-anthracenesulfonic acid.;Wherein X is a hydrogen atom, methyl or And Y represents a hydrogen atom, a halogen atom, a nitro group, a cyano group, an acetyl group, or an aliphatic alkyl group having 1 to 6 carbon atoms.