反应详情

To a suspension of 7-(4-chloro-2-methoxycarbonylmethoxyimino-3-oxobutyramido)-3-vinyl-3-cephem-4-carboxylic acid (syn isomer) (2.0 g) in water (20 ml) were added thiourea (0.683 g) and sodium acetate (1.84 g) at 40° C. with stirring. The reaction mixture was stirred at the same temperature for 1.5 hours. The resultant solution was adjusted to pH 2.8 with 10% hydrochloric acid and stirred under ice-cooling for 20 minutes. The precipitates were collected by filtration, washed with water and dried over phosphorus pentoxide under reduced pressure to give 7-[2-(2-aminothiazol-4-yl)-2-methoxycarbonylmethoxyiminoacetamido]-3-vinyl-3-cephem-4-carboxylic acid (syn isomer) (1.9 g).

1. stirringThe reaction mixture was stirred at the same temperature for 1.5 hours
2. stirringstirred under ice-
3. temperaturecooling for 20 minutes
4. filtrationThe precipitates were collected by filtration
5. washwashed with water
6. dry with materialdried over phosphorus pentoxide under reduced pressure