Hydrochloric Acid → 7-[2-(2-Aminothiazol-4-yl)-2-(2-methylthiazol-4-ylmethoxyimino)acetamido]-3-cephem-4-carboxylic acid hydrochloride

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A mixture of 7-[2-(2-formamidothiazol-4-yl)-2-(2-methylthiazol-4-ylmethoxyimino)acetamido]-3-cephem-4-carboxylic acid (syn isomer, 240 mg.) and conc. hydrochloric acid (71 mg.) in methanol (2.5 ml.) was stirred at room temperature for 6.5 hours. After removing the solvent from the resultant solution in vacuo, the residue was triturated with diisopropyl ether. The precipitates were collected by filtration and washed with diisopropyl ether to give colorless crystals of 7-[2-(2-aminothiazol-4-yl)-2-(2-methylthiazol-4-ylmethoxyimino)acetamido]-3-cephem-4-carboxylic acid hydrochloride (syn isomer, 236 mg.)

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