反应详情

温度

-30 °C

To a solution of 7β-amino-3-(trityl-1,2,3-triazol-4ylthiomethylthio)-3-cephem-4-carboxylic acid diphenylmethyl ester (800 mg: 1.06 mMol.) and 2-(2-t-butoxycarbonylaminothiazol-4-yl)glyoxylic acid (303 mg: 1.11 mMol.) in dichloromethane (8 ml) cooling at -30° C. are added N-methylmorpholine (0.27 ml) (2.46 mMol.) and phenyl dichlorophosphate (0.19 ml: 1.27 mMol.), and the mixture is stirred at -30° C. for 1 hour. The reaction mixture is mixed with 10% hydrochloric acid (1 ml), diluted with water, and extracted with ethyl acetate. The extract is washed with brine, dried over sodium sulfate, and concentrated. The residue is purified by silica gel chromatography (toluene: ethyl acetate=2:1) to give 7β-[2-(2-t-butoxycarbonylaminothiazol-4-yl)-glyoxylylamino]-3-(trityl-1,2,3-triazol-4-ylthiomethylthio)-3-cephem-4-carboxylic acid diphenylmethyl ester (679 mg) as yellow foam. Yield: 64%.

1. extractionextracted with ethyl acetate
2. washThe extract is washed with brine
3. dry with materialdried over sodium sulfate
4. concentrationconcentrated
5. customThe residue is purified by silica gel chromatography (toluene: ethyl acetate=2:1)