Hydrochloric Acid → HCID 131712602, compound

Participants

Reaction Steps

Conc. hydrochloric acid (0.85 g.) was added under ice-cooling to a stirred solution of 7-[2-ethoxyimino-2-(2-formamidothiazol-4-yl)acetamido]-3-(1,3,4-thiadiazol-2-yl)thiomethyl-3-cephem-4-carboxylic acid (syn isomer) (2.3 g) in a mixture of methanol (23 ml.) and tetrahydrofuran (23 ml.), and the mixture was stirred for 2.5 hours at ambient temperature. The solvent was distilled off under reduced pressure and the residue was dissolved in a saturated aqueous solution of sodium bicarbonate (pH 7.0). The aqueous solution was washed with ethyl acetate and adjusted to pH 3.5 with conc. hydrochloric acid. Precipitates were collected by filtration, washed with water and dried to give powder of 7-[2-ethoxyimino-2-(2-aminothiazol-4-yl)acetamido]-3-(1,3,4-thiadiazol-2-yl)thiomethyl-3-cephem-4-carboxylic acid (syn isomer) (1.865 g.).

Provenance & Evidence