(2-Formamido-1,3-thiazol-4-yl)(oxo)acetic acid → 2-(2-Formamidothiazol-4-yl)-2-(2-tert-butoxycarbonylaminoethoxyimino)acetic acid

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Reaction Steps

A mixture of 2-(2-formamidothiazol-4-yl)-glyoxylic acid (1.59 g.), tert-butyl N-aminooxyethylcarbamate (1.40 g.) and methanol (25 ml.) was stirred at room temperature for 6 hours. After removal of methanol from the resultant solution under reduced pressure, the residue was pulverized with diethyl ether. The precipitates were collected by filtration to give 2-(2-formamidothiazol-4-yl)-2-(2-tert-butoxycarbonylaminoethoxyimino)acetic acid (syn isomer, 2.20 g.).

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