Abstract
We report herein the interaction of diethylethoxymethylene malonate (1) with 2‐cyanomethylbenzothiazole (7) to give diethyl 2‐(2‐benzothiazole‐2‐(3H)‐ylidiene)‐2‐(cyano ethyl) malonate (8a) in excellent yield. Ethyl 4‐cyano‐1‐oxo‐1H‐benzo[4,5]thiazolo[3,2‐a]pyridine‐2‐carboxylate (9) was synthesized from 8a and subjected to react with hydrazine hydrate to give its corresponding acid hydrazide 10. Condensation of 10 with different acid anhydrides afforded the corresponding benzothiazolo pyridine carboxamide derivatives 11–15. In addition, we report a simple synthesis of N′‐(benzo[d]thiazol‐2‐yl)‐2‐((4‐ayl)amino)acetohydrazide derivative (17), which then reacted with different amines to give the corresponding acetohydrazide derivatives 19a–c. Moreover, compound 17 reacted with some sulfonamide derivatives to give the corresponding sulfonamide derivatives 20 and 22a,b.The newly synthesized compounds were established their structures on the bases of their correct analytical and spectral data and evaluated their antimicrobial activity. It was found that compounds 22a,b displayed the highest antimicrobial activity against the tested organisms.
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