反应详情

A mixture of 7-[2-(2-formamidothiazol-4-yl)-2-(3-tert-butoxycarbonylaminopropoxyimino)acetamido]-3-(5-tert-butoxycarbonylaminomethyl-1,3,4-thiadiazol-2-yl)thiomethyl-3-cephem-4-carboxylic acid (syn isomer, 1.5 g.), conc. hydrochloric acid (0.8 ml.), methanol (30 ml.) and tetrahydrofuran (30 ml.) was stirred at room temperature for 3 hours. After evaporation, methanol was added to the residue. The solution was evaporated in vacuo again, and the residue was dissolved in water (30 ml.). The solution was adjusted to pH 3.5 with saturated aqueous sodium bicarbonate solution under ice-cooling. The solution was subjected to column chromatography on macroporous non-ionic adsorption resin "Diaion HP-20" (trademark: Mitsubishi Chemical Industries Ltd.) and eluted with 30% aqueous isopropyl alcohol. The eluate was concentrated in vacuo and lyophilized to give 7-[2-(2-aminothiazol-4-yl)-2-(3-aminopropoxyimino)acetamido]-3-(5-aminomethyl-1,3,4-thiadiazol-2-yl)thiomethyl-3-cephem-4-carboxylic acid (syn isomer, 0.6 g.).

1. customAfter evaporation, methanol
2. additionwas added to the residue
3. customThe solution was evaporated in vacuo again
4. dissolutionthe residue was dissolved in water (30 ml.)
5. temperaturecooling
6. wash" (trademark: Mitsubishi Chemical Industries Ltd.) and eluted with 30% aqueous isopropyl alcohol
7. concentrationThe eluate was concentrated in vacuo