Hydrochloric Acid → 2-Ethoxycarbonylmethoxyimino-2-(2-formamidothiazol-4-yl)acetic acid

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Reaction Steps

Sodium bicarbonate (0.84 g.) was added to a suspension of 2-(2-formamidothiazol-4-yl)glyoxylic acid (2 g.) in water (120 ml.) to prepare a solution. Ethyl 2-aminooxyacetate hydrochloride (4.56 g.) was added to the solution and stirred at ambient temperature for 3 hours while adjusting a pH 6 with sodium bicarbonate. The resultant solution was adjusted to pH 1.5 with hydrochloric acid, salted out and extracted with ethyl acetate three times. The extract was dried over magnesium sulfate and concentrated in vacuo. The residue was pulverized with diethyl ether, and the precipitates were collected by filtration and dried to give 2-ethoxycarbonylmethoxyimino-2-(2-formamidothiazol-4-yl)acetic acid (syn isomer) (1.44 g.), mp. 112° C. (dec.).

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