Hydrazine hydrate (1:1) → N-[2-(5-amino-4-benzothiazol-2-yl-1H-pyrazol-3-ylamino)ethyl]acetamide

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A mixture of 2-benzothiazol-2-yl-3,3-bis-methylsulfanylacrylonitrile (200 mg, 0.74 mmol) and N-acetylethylenediamine (83 mg, 0.81 mmol) in ethanol (10 mL) was refluxed for 90 min. To this solution was added hydrazine hydrate (61 mg, 1.2 mmol), and the resulting mixture was refluxed overnight. Solids formed upon cooling. The resulting crystals were filtered and washed with ethanol to yield 150 mg (66%) of N-[2-(5-amino-4-benzothiazol-2-yl-1H-pyrazol-3-ylamino)ethyl]acetamide. MS (ES+): 317.1 (M+1, 100%).

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