The review presents the most elegant and promising set of synthetic routes for the synthesis of 2‐aminothiophenes by the Gewald reaction. Applications of this facile methodology to pharmaceuticals and dyestuffs have been demonstrated.

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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.

Oxygen evolution reaction (OER) in water splitting is one of the most critical and more demanding half-reactions in electrochemical devices; therefore, the design of highly efficient and nonprecious metal-based electrocatalysts is required.

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A novel efficient synthesis of 2‐styrylthiazolo[4,5‐b]quinoxaline based fluorescent dyes was achieved by the condensation of 2‐alkylthiazolo[4,5‐b]quinoxaline with selected 4‐N,N‐dialkylamino‐substituted aryl‐aldehydes or hetarylaldehydes in the presence of piperidine or acid anhydride. The coloristic, fluorophoric and dyeing properties of these dyes were studied.

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Synthesis and Application of 2- 5b]quinoxaline Based Fluorescent Dyes.Part 3.-A new efficient synthesis of the title dyes based on the condensation of 2-methyl-6,7-dichlorothiazolo[4,5-b]quinoxaline (IV) with dialkylaminoarylaldehydes or heteroarylaldehydes as well as fluorescence and dyeing properties of the products are described. -(SONAWANE, N. D.; RANGNEKAR, D. W.; J. Heterocycl.