A review on synthesis of nitrogen-containing heterocyclic dyes for textile fibers - Part 1: Five and six-membered heterocycles

Abstract

T HE SIGNIFICANCE of heterocyclic dyestuffs has recently increased due to their deep hues and brightness, high color strength and better colorfastness compared to benzene analogous dyes. In this review, we give details outlining the synthetic approaches of all recently synthesized nitrogen-containing five and six-membered ring heterocyclic dyestuffs and their dyeing efficiency on textile fibers.

Synthesis and pharmacological activities of azo dye derivatives incorporating heterocyclic scaffolds: a review

“…The salt was subjected to coupling with N -benzyl- N -ethyl- m -acetamide aniline 25 to afford compound 26 in good yield. 18 Compound 26 undergoes the methylation reaction through an alkylating agent to methylate the imidazole ring 27 as described in Scheme 5 .…”