Hydrochloric Acid → HCID 131713036, compound

Participants

Reaction Steps

To a solution of 7-[2-(2-cyclopenten-1-yl)oxyimino-2-(2-formamidothiazol-4-yl)acetamido]-3-[1-[3-(N-tertbutoxycarbonylamino)propyl]-1H-tetrazol-5-yl]thiomethyl-3-cephem-4-carboxylic acid (syn isomer) (1.75 g) in methanol (13 ml) was added conc.hydrochloric acid (1.0 g) with stirring and the mixture was stirred for 3 hours at room temperature. After the evaporation of the resulting mixture, to the residue was added methanol (20 ml) to give a homogeneous solution and then the solution was evaporated. Solution and evaporation were repeated three times and to the resulting reaction mixture were added ethyl acetate and water. After the mixture was adjusted to pH 7.5 with sodium bicarbonate, the aqueous layer was separated, washed with ethyl acetate and the remaining ethyl acetate was distilled off. The resulting aqueous layer was adjusted to pH 3.8 with 1 N hydrochloric acid and then filtered. The precipitates thus collected were washed with water and dried over phosphorus pentoxide under reduced pressure to give 7-[2-(2-cyclopenten- 1-yl)oxyimino-2-(2-aminothiazol-4-yl)acetamido]-3-[1-(3-aminopropyl)-1H-tetrazol-5-yl]thiomethyl-3-cephem-4-carboxylic acid (syn isomer)(0.31 g).

Provenance & Evidence