Hydrochloric Acid → 7-[2-methoxyimino-2-(2-aminothiazol-4-yl)acetamido]-3-[1-(2-propynyl)-1H-tetrazol-5-yl]thiomethyl-3-cephem-4-carboxylic acid

Participants

Reaction Steps

To a mixture of 7-[2-methoxyimino-2-(2-formamidothiazol-4-yl)acetamido]-3-[1-(2-propynyl)-1H-tetrazol-5-yl]thiomethyl-3-cephem-4-carboxylic acid (syn isomer) (1.4 g) in methanol (10.0 ml) were added conc. hydrochloric acid (0.52 g) and tetrahydrofuran (5.0 g) and the mixture was stirred for 2 hours and 10 minutes at room temperature. After the evaporation of the reaction mixture, to the residue were added water and ethyl acetate and then the resulting mixture was adjusted to pH 7.0 with a saturated aqueous solution of sodium carbonate. The aqueous layer was separated, washed with ethyl acetate (×2) and then concentrated. The concentrate was adjusted to pH 3.0 with 10% hydrochloric acid and the precipitates were collected by filtration, washed with water and dried over phosphorus pentoxide under reduced pressure to give 7-[2-methoxyimino-2-(2-aminothiazol-4-yl)acetamido]-3-[1-(2-propynyl)-1H-tetrazol-5-yl]thiomethyl-3-cephem-4-carboxylic acid (syn isomer) (0.65 g).

Provenance & Evidence