Ammonium Hydroxide → 6-Chloroimidazo[2,1-b][1,3]thiazole-5-sulfonamide

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2 g (1 mol equiv.) 6-Chloro-imidazo[2,1-b]thiazole-5-sulfonyl chloride was dissolved in 20 mL acetonitrile and cooled to 0° C. Dropwise, 3.7 mL (3 mol equiv.) ammoniumhydroxide was added and the reaction mixture was stirred at room temperature for 10 min, during which a white precipitate was formed. Volatiles were removed under reduced pressure, and the solid residue was washed with water and dried in vacuo affording 1.62 g (88%) 6-chloro-imidazo[2,1-b]thiazole-5-sulfonic acid amide. 1H NMR (400 MHz, DMSO-d6) δ 7.62 (d, J=4.6 1H), 7.98 (d, J=4.6 Hz, 1H), 8.00 (br.s., 2H).

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