Sodium borohydride → HCID 178432391, 화합물

In 4 liters of ethanol was suspended 45.4 g of 7-hydroxy-5-methoxycarbonyl-2-methyl-s-triazolo[1,5-a]pyrimidine and 37.83 g of sodium borohydride was added little by little thereto, and the mixture was then stirred at room temperature for 3 hours. A residue obtained by removing ethanol was dissolved in 2 liters of water, and 500 ml of Amberlite IRC-50 (H+) (trade name) was added thereto and stirred. Subsequently, the mixture was filtered and after removing water from the filtrate, 500 ml of methanol was added to the filtrate and the mixture was stirred. Then, methanol was removed from the mixture to obtain a residue. These procedures were repeated three times. Then, 500 ml of ethanol was added to the residue and the mixture was condensed. Precipitated crystals were collected by filtration, washed with ethanol and dried to obtain 39.35 g of the title compound.