反应详情

In 50 ml of water is suspended 2.30 g of 7β-amino-3-hydroxymethyl-3-cephem-4-carboxylic acid and the suspension is adjusted to pH 8.5 with 1N-aqueous sodium hydroxide solution, whereupon a clear solution is obtained. To this solution are added 4.56 g of S-p-methoxybenzyloxycarbonyl-4,6-dimethyl-2-mercaptopyridine and 50 ml of dioxane and the mixture is stirred at room temperature for 7 hours. The reaction mixture is diluted with water and ethyl acetate and the water layer is separated and concentrated under reduced pressure. The residue is subjected to XAD-II (500 ml) column chromatography and after the column is washed with water, elution is carried out with 10% (v/v) ethanol. The eluate is concentrated under reduced pressure and freeze-dried to give 1.63 g of sodium 7β-(p-methoxybenzyloxycarbonylamino)-3-hydroxymethyl-3-cephem-4-carboxylate as colorless powders.

1. customis obtained
2. customthe water layer is separated
3. concentrationconcentrated under reduced pressure
4. washafter the column is washed with water, elution
5. concentrationThe eluate is concentrated under reduced pressure
6. customfreeze-dried