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Thiazoles are important scaffolds in organic chemistry. Biosynthesis of thiazoles is considered to be an excellent target for the design of novel classes of therapeutic agents. In this study, a new series of 2-ethylidenehydrazono-5-arylazothiazoles 5a-d and 2-ethylidenehydrazono-5-arylazo- thiazolones 8a-d were synthesized via the cyclocondensation reaction of the appropriate hydrazonyl halides 4a-d and 7a-d with ethylidene thiosemicarbazide 3, respectively. Furthermore, the thiosemicarbazide derivative 3 was reacted with different bro