Hydrochloric Acid → 7-[2-Isopropoxyimino-2-(2-amino-1,3-thiazol-4-yl)acetamido]-3-carbamoyloxymethyl-3-cephem-4-carboxylic acid

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Conc. hydrochloric acid (1 ml) was added to a solution of 7-[2-isopropoxyimino-2-(2-formamido-1,3-thiazol-4-yl)acetamido]-3-carbamoyloxymethyl-3-cephem-4-carboxylic acid (syn isomer)(1.3 g) in a mixture of tetrahydrofuran (10 ml) and methanol (10 ml). The mixture was stirred for 3.5 hours at ambient temperature and then concentrated to dryness. Water was added to the residue and to the mixture was added sodium bicarbonate to give a solution. The solution was adjusted to pH 3.0 with conc. hydrochloric acid under ice-cooling. Precipitates were collected by filtration, washed with water and dried to give 7-[2-isopropoxyimino-2-(2-amino-1,3-thiazol-4-yl)acetamido]-3-carbamoyloxymethyl-3-cephem-4-carboxylic acid (syn isomer)(0.25 g).

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