反应详情

温度

10 °C

N-Hydroxy-7-mercapto-N,5-dimethyl-s-triazolo[1,5-a]pyrimidine-2-carboxamide (53 mg) (0.22 mmol) and 54 mg (0.2 mmol) of 7-aminocephalosporanic acid are suspended in 1 ml of dichloromethane/sulpholane (1:1 v/v). 0.5 ml of boron trifluoride diethyl etherate is added thereto at 10° C. while stirring and the mixture is stirred at room temperature for a further 20 hours. Subsequently, about 10 ml of dichloromethane are added thereto, the insoluble material is filtered off under suction, dissolved in water and the product is precipitated by the addition of sodium hydrogen carbonate (pH→4). The precipitate is filtered off under suction and washed with water and ethanol. There are obtained 66 mg of (6R,7R)-7-amino-3-[[[2-(N-hydroxy-N-methylcarbamoyl)-5-methyl-s-triazolo[1,5-a]pyrimidin-7-yl]thio]methyl]-8-oxo-5-thia-1-azabicyclo[4,2,01oct-2-ene-2-carboxylic acid as a white powder.

1. stirringthe mixture is stirred at room temperature for a further 20 hours
2. filtrationthe insoluble material is filtered off under suction
3. dissolutiondissolved in water
4. customthe product is precipitated by the addition of sodium hydrogen carbonate (pH→4)
5. filtrationThe precipitate is filtered off under suction
6. washwashed with water and ethanol