Hydrochloric Acid → 2-amino-N-methyl-1,3-thiazole-5-carboxamide

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Reaction Steps

tert-Butyl 5-(methylcarbamoyl)thiazol-2-ylcarbamate (0.77 g, 3.0 mmol) was added to TFA (1.5 mL) that was cooled in a water bath. The solution obtained was stirred at room temperature for 1.5 h. A second batch of TFA (1.5 mL) was added and the reaction mixture was stirred at 40° C. for 30 min and then concentrated in vacuo. To the residue was added 1 M aqueous solution of HCl (3.0 mL, 3.0 mmol) and deionized water (2.0 mL) and the solution concentrated under reduced pressure. Lyophilization gave 2-amino-N-methylthiazole-5-carboxamide (HCl salt, 750 mg) as a white powder. MS found: (M+H)+=158. The crude product was used as such in the next step without further purification.

Provenance & Evidence