Hydrochloric Acid → 7-[2-Methylthiomethoxyimino-2-(2-aminothiazol-4-yl)acetamido]-3-(1,3,4-thiadiazol-2-yl)thiomethyl-3-cephem-4-carboxylic acid

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A mixture of 7-[2-methoxythiomethoxyimino-2-(2-formamidothiazol-4-yl)acetamido]-3-(1,3,4-thiadiazol-2-yl)thiomethyl-3-cephem-4-carboxylic acid (syn isomer) (0.58 g.), conc. hydrochloric acid (0.405 g.), methanol (8.7 ml.) and tetrahydrofuran (5 ml.) was stirred for 2 hours and 10 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 7~8.5). An insoluble material was filtered off and the filtrate was adjusted to pH 3.4 with 10% hydrochloric acid under ice-cooling and stirred for 30 minutes. Precipitates were collected by filtration, washed with water and dried to give 7-[2-methylthiomethoxyimino-2-(2-aminothiazol-4-yl)acetamido]-3-(1,3,4-thiadiazol-2-yl)thiomethyl-3-cephem-4-carboxylic acid (syn isomer) (0.4 g.).

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