ES402044A1 - Monoazo dyestuffs containing hydroxypyridone residues - Google Patents

Abstract

Procedure for obtaining water-insoluble monoazo dyes of the general formula **(See formula)** in which R1 means an aromatic residue free of groups that make it water soluble, R2 means a group -O-CO- or -C0-O, R3 means an aromatic residue free of groups that make it water soluble, X means hydrogen, a group cyano, an alkoxy group, a carboxy group, an alkyl group, optionally branched and/or substituted, an alkenyl group, optionally branched and/or substituted, a cycloalkyl group, optionally substituted, an aralkyl group, a aryl group or a heterocyclic moiety, Y means hydrogen, a cyano group, an alkyl group, optionally branched and/or substituted, an alkenyl group, if branched and/or substituted, a cycloalkyl group, if substituted, a aralkyl group, an aryl group, or residues -COOR4, -CO5, (see formula), -SO2R5 or (see formula) where R4 and R5 signify an alkyl group, R5 also signifies a cycloalkyl, aralkyl or aryl group, optionally substituted, and R6 and R7 signify hydrogen, an alkyl, hydroxyalkyl, alkoxyalkyl, cycloalkyl, aralkyl or aryl group, where the alkyl radicals R6 and R7 may also be linked directly or through a heteroatom, Z stands for hydrogen, an amino group, optionally substituted, an alkyl group, optionally branched and/or substituted, an alkenyl group, in case branched and/or substituted die, a cycloalkyl group, an optionally substituted aralkyl or aryl group, or a heterocyclic moiety, characterized in that an amine of general formula II is diazotized R1-R2-R3-NH2 II and is coupled with a 6-hydroxy-2-pyridone derivative of the general formula **(See formula)** where R1, R2, R3, X, Y and Z have the meanings indicated above. (Machine-translation by Google Translate, not legally binding)