2-Hydroxy-pyridone and 1-hydroxy-pyrido:benzimidazole amide derivs. - prepd. from keto-acetate and malonamide or acetamide cpd., for dyestuff prodn.

摘要

New pyridine derivs. are of formula (I) In (I) r is H or 1-4C alkyl. R1 is a (cyclo)aliphatic, araliphatic or aromatic gp. X is O or R' and X together are a gp. of formula (II); Y iH, Me, Et, MeO, EtO, Cl, Br, hydroxysulphonyl, carboxyl, 1-4C alkoxycarbonyl or carbamoyl. R and R1 pref. are 1-8C alkyl, beta-hydroxy-or -(m)-ethoxy-ethyl or -propyl, beta-cyanoethyl or phenylethyl. (I) are used for the prodn. of dyestuffs. They are valuable coupling components for the prodn. of azo dyestuffs and can also be used as CH-acid cpds., e.g. for condensn. reactions leading to dyestuffs.