反应详情

温度

50 °C

Thiourea (8.4 mg.) was added to a solution of 7-(2-methoxyimino-3-oxo-4-bromobutyramido)-3-cephem-4-carboxylic acid (syn isomer, 42 mg.) in ethanol (6 ml.) and stirred at room temperature for an hour and at 50° C. for 30 minutes. After removing ethanol from the reaction mixture in vacuo, water (5 ml.) was added to the residue and adjusted to pH 4.0 with 6N-hydrochloric acid. The precipitates were collected by filtration and dried to give 7-[2-(2-aminothiazol-4-yl)-2-methoxyiminoacetamido]-3-cephem-4-carboxylic acid (syn isomer, 8 mg.). The filtrate was subjected to column chromatography on nonionic, adsorption resin "Diaion HP-20" (trademark: manufactured by Mitsubishi Chemical Industries Ltd., 5 ml.), washed with chilled water (5 ml.) and eluted with 20% aqueous isopropyl alcohol. The eluate was adjusted to pH 6.5 with 1N aqueous sodium hydroxide under ice-cooling, and concentrated in vacuo. The residue was lyophilized to give sodium 7-[2-(2-aminothiazol-4-yl)-2-methoxyiminoacetamido]-3-cephem-4-carboxylate (syn isomer, 15 mg.).

1. customAfter removing ethanol from the reaction mixture in vacuo, water (5 ml.)
2. additionwas added to the residue
3. filtrationThe precipitates were collected by filtration
4. customdried