A green and efficient synthesis of novel 4-thiazolidinones 4 from cyclocondensation reaction of 2-(2,3-dihydro-
1H-carbazol-4(9H)-ylidene)hydrazinecarbothioamide 3 and α-haloacids catalyzed by N-methylpyridinium tosylate in
quantitative yield is reported. Also, synthesis of new 2,4-disubstituted thiazoles 5 under grinding conditions is reported.
Keywords: 4-Thiazolidinones, N-methylpyridinium tosylate, cyclocondensation, thiazoles, grinding, heterocyclic carbazole motif, optoelectronic devices, quantitative, internal standard, chromatography
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