Synthesis and application of 2‐styryl‐6,7‐dichlorothiazolo[4,5‐b]‐quinoxaline based fluorescent dyes: Part 3

Abstract

A new efficient synthesis of 2-styryl-6,7-dichlorothiazolo[4,5-b]quinoxaline based fluorescent dyes was achieved by the condensation of 2-methyl-6,7-dichlorothiazolo [4,5-b]quinoxaline with selected 4-N,Ndialkylaminoarylaldehydes and heteroarylaldehydes in the presence of piperidine. The coloristic, fluorophoric, and dyeing properties of these dyes were studied.

An efficient synthesis of quinoxalines catalyzed by monoammonium salt of 12-tungstophosphoric acid

“…They have also found applications as dyes [7,8] and building blocks in the synthesis of organic semi conductors [9,10]. A number of synthetic strategies have been developed for preparation of substituted quinoxalines [11].…”

A novel fluorescent bisazomethine dye derived from 3-hydroxyquinoxaline-2-carboxaldehyde and 2,3-diaminomaleonitrile

“…They find applications as dyes [1][2][3], as fluorescent materials [4][5][6] and as organic light emitting devices [7][8][9][10][11][12][13]. Quinoxaline derivatives exhibit a broad spectrum of biological activities [14,15] and find place in the chemical libraries for DNA binding [16,17].…”

Isocyanide‐Based Three‐Component Synthesis of Highly Substituted 1,6‐Dihydro‐6,6‐dimethylpyrazine‐2,3‐dicarbonitrile, 3,4‐Dihydrobenzo[g]quinoxalin‐2‐amine, and 3,4‐Dihydro‐3,3‐dimethyl‐quinoxalin‐2‐amine Derivatives

“…It is conceivable that the initial event is the formation of imine derivative 11 by a condensation of 2 and 3 [28 -33]. In the case of Meldrums acid (4), the reaction may be rationalized by initial formation of malonic acid (15) and acetone (16) by the wellknown hydrolysis of 4 in H 2 O [34]. In the next step, imine derivative 12 is obtained by decarboxylation of 11 [35] or by condensation of 2 and 16.…”