Hydrochloric Acid → 2-Tert-butoxycarbonyloxyamino-4-trifluoromethyl-thiazole-5-carboxylic acid

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A stirred solution of ethyl-2-tert-butoxycarbonyloxyamino-4-trifluoromethyl-thiazole-5-carboxylate (6.5 g, 19.1 mmol) in methanol (100 mL) was treated with a 1N aq. NaOH solution (573 mL). The mixture was stirred at rt overnight. The solution was cooled to 0° C. and acidified with a 6 M aq. HCl solution to pH 1 and extracted with chloroform (150 mL, 6×). The chloroform extracts were combined, dried (Na2SO4), filtered and concentrated under reduced pressure and in vacuo to obtain the title acid (5.75 g, 96%) as a white solid.

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