N,N-Dimethylaniline → 5-Acetoxymethyl7-chloro-2-methyl-s-triazolo[1,5-a]pyrimidine

Participants

Reaction Conditions

Reaction Steps

In 300 ml of phosphorus oxychloride was added dropwise 40 ml of N,N-dimethylaniline, and 35 g of 5-acetoxymethyl-7-hydroxy-2-methyl-s-triazolo[1,5-a]pyrimidine was added to the mixture and the mixture was stirred at 50° C. for one hour. An oily residue obtained by removing phosphorus oxychloride was dissolved in 500 ml of chloroform and ice-cooled. After addition of crushed ice and water to the mixture and stirring thereof, a chloroform layer was separated, washed with water and dried over anhydrous magnesium sulfate. Then, removing a solvent, an oily product was obtained. This was applied to a silica gel column chromatography (eluent: chloroform) and fractions containing the title compound were condensed to obtain an oily product. This was allowed to stand to cool and crystallized to obtain 31 g of the title compound.

Provenance & Evidence