Hydrochloric Acid → HCID 131712598, compound

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A mixture of 7-[2-t-butoxycarbonylmethoxyimino-2-(2-formamidothiazol-4-yl)acetamido]-3-(1,3,4-thiadiazol-2-yl)thiomethyl-3-cephem-4-carboxylic acid (syn isomer) (2.3 g.), conc. hydrochloric acid (3.74 g.) and methanol (35 ml.) was stirred for 2 hours and 40 minutes at ambient temperature. The solvent was distilled off under reduced pressure and the residue was dissolved in a 10% aqueous solution of sodium hydroxide (pH 7~8). The aqueous solution was adjusted to pH 3.0 with 10% hydrochloric acid under ice-cooling and stirring and stirred for 30 minutes. Precipitates were collected by filtration, washed with water and dried to give 7-[2-t-butoxycarbonylmethoxyimino-2-(2-aminothiazol-4-yl)acetamido]-3-(1,3,4-thiadiazol-2-yl)thiomethyl-3-cephem-4-carboxylic acid (syn isomer) (1.1 g.).

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