反应详情

Trifluoroacetic acid (0.805 g) was added to a suspension of benzhydryl 7-[2-benzhydryloxycarbonylmethoxyimino-2-(2-aminothiazol-4-yl)acetamido]-3-(2,2-difluorovinyl)-3-cephem-4-carboxylate-1-oxide (syn isomer) (0.3 g) in methylene chloride (0.6 ml) and anisole (0.382 g) under ice-cooling and the mixture was stirred at the same temperature for 30 minutes. The reaction mixture was dropwise added to diisopropylether (10 ml) and the precipitates were collected by filtration. The precipitates were added to a mixture of ethyl acetate and water and the mixture was adjusted to pH 7.0 with saturated aqueous sodium bicarbonate. The separated aqueous layer was acidified to pH 3.0 with 10% hydrochloric acid and the precipitates were collected by filtration to give 7-[2-carboxymethoxyimino-2-(2-aminothiazol-4-yl)acetamido]-3-(2,2-difluorovinyl)-3-cephem-4-carboxylic acid-1-oxide (syn isomer) (0.05 g).

1. temperaturecooling
2. filtrationthe precipitates were collected by filtration
3. additionThe precipitates were added to a mixture of ethyl acetate and water
4. filtrationthe precipitates were collected by filtration