2-(2-Aminothiazol-4-yl)glyoxylic acid

89721-50-6

73150-67-1

Under ice bath cooling conditions, 10.1 g of methyl 2-(2-aminothiazol-4-yl)thioacetoxy S-acid (CAS: 89721-50-6) was mixed with 80 mL of water, followed by the addition of 10.6 g of sodium carbonate. The reaction mixture was stirred continuously for 1 h at a maintained ice bath temperature. Upon completion of the reaction, the pH of the reaction mixture was adjusted to 2.5 at the same temperature using 6 N hydrochloric acid. the precipitated crystals were collected by filtration, washed with deionized water and subsequently dried to afford 6.2 g (67.8% yield) of 2-(2-aminothiazol-4-yl)glyoxalic acid with a melting point of more than 200°C. The infrared spectra of the product (KBr pressed slice) showed a νC=O absorption peak at 1660 cm?1.