反应详情

Methyl 1,2,4-triazole-3-carboxylate and 1,2,3,5-tetra-O-acetyl-β-L-ribofuranose are heated under reduced pressure in the presence of trifluoromethanesulfonic acid or bis(p-nitrophenyl)-phosphate. The residue is recrystallized from ethanol or methanol to obtain methyl 1-(2,3,5-tri-O-acetyl-β-L-ribofuranosyl)-1,2,4-triazole-3-carboxylate. Subsequently, the obtained methyl 1-(2,3,5-tri-O-acetyl-β-L-ribofuranosyl)-1,2,4-triazole-3-carboxylate is treated with ammonia in a methanol solvent, and the resultant mixture is then recrystallized from ethanol to obtain a crude product of 1-(2,3,5-tri-O-acetyl-β-L-ribofuranosyl)-1,2,4-triazole-3-carboxamide. The obtained compound is further recrystallized from an ethanol aqueous solution, so as to obtain high-purity 1-(2,3,5-tri-O-acetyl-β-L-ribofuranosyl)-1,2,4-triazole-3-carboxamide.

1. customThe residue is recrystallized from ethanol or methanol