Hydrochloric Acid → HCID 178502817, compound

Participants

Reaction Steps

To a solution of trifluoroacetic acid salt of 7β-[2-(2-formamidothiazol-4-yl)-2-methoxyiminoacetamido]-3-(2-methyl-1-pyrazolio)methyl-3-cephem-4-carboxylate (syn isomer, 2.2 g) in methanol (11 ml) was added conc. hydrochloric acid (0.78 ml) at room temperature, and the mixture was stirred at the same temperature for 2 hours. The reaction mixture was added to diethyl ether (300 ml), and the precipitates were collected by filtration. The precipitates were dissolved in water (20 ml) and the solution was adjusted to pH 5 with saturated aqueous solution of sodium bicarbonate. The solution was subjected to column chromatography on macroporous non-ionic adsorption resin "Diaion HP-20" and eluted with 15% aqueous solution of isopropyl alcohol. The fractions containing the object compound were collected and evaporated in vacuo to remove isopropyl alcohol. The solution was lyophilized to give 7β-[2-(2-aminothiazol-4-yl)-2-methoxyiminoacetamido]-3-(2-methyl-1-pyrazolio)methyl-3-cephem-4-carboxylate (syn isomer, 0.78 g).

Provenance & Evidence