反应详情

A solution of 7-[2-{2-(2,2,2-trifluoroacetamido)-4-thiazolyl}-2-methoxyiminoacetamido]-3-methoxy-3-cephem-4-carboxylic acid (syn isomer, 0.55 g.) and sodium acetate trihydrate, (1.76 g.) in ethyl acetate (3 ml.), tetrahydrofuran (3 ml.) and water (5.5 ml.) was stirred at room temperature overnight. The aqueous layer was separated from the resultant mixture, washed with dichloromethane, and then evaporated under reduced pressure to remove the organic solvent. The aqueous solution was adjusted to pH 4.2 under ice-cooling, and subjected to column chromatography on Diaion HP-20 resin (Trade mark: manufactured by Mitsubishi Chemical Industries Ltd., 15 ml.). After washing the column with water, the object compound was eluted with 20% aqueous isopropyl alcohol. The eluate was concentrated under reduced pressure and the residue was lyophilized to give 7-{2-(2-amino-4-thiazolyl)-2-methoxyiminoacetamido}-3-methoxy-3-cephem-4-carboxylic acid (syn isomer 0.4 g.), m.p. 185° to 190° C. (dec.).

1. customThe aqueous layer was separated from the resultant mixture
2. washwashed with dichloromethane
3. customevaporated under reduced pressure
4. customto remove the organic solvent
5. temperaturecooling
6. washAfter washing the column with water
7. washthe object compound was eluted with 20% aqueous isopropyl alcohol
8. concentrationThe eluate was concentrated under reduced pressure