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

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A mixture of 7-[2-(2-formamidothiazol-4-yl)-2-cyanomethoxyiminoacetamido]-3-(1,3,4-thiadiazol-2-yl)thiomethyl-3-cephem-4-carboxylic acid (syn isomer, 0.8 g.), methanol (12 ml.), conc hydrochloric acid (0.55 g.) and tetrahydrofuran (10 ml.) was stirred at room temperature for 3 hours. After concentrating the resultant solution in vacuo, the residue was dissolved in an aqueous solution of sodium bicarbonate. The solution was adjusted to pH 3.5 with 10% hydrochloric acid and stirred for 30 minutes. The precipitates were collected by filtration, washed with water and dried to give 7-[2-(2-aminothiazol-4-yl)-2-cyanomethoxyiminoacetamido]-3-(1,3,4-thiadiazol-2-yl)thiomethyl-3-cephem-4-carboxylic acid (syn isomer, 0.56 g.).

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