反应详情

Trifluoroacetic anhydride (4.0 ml) was added dropwise to a stirred solution of 3,4-dimethoxy-2-methylpyridine N-oxide (1.91 g) in dichloromethane (25 ml) and the mixture was left to stand at room temperature for 8 days during which time trifluoroacetic anhydride (4.77 ml) was added in two portions. The mixture was evaporated to dryness and the residue was purified by extracting a chloroform solution with aqueous sodium bicarbonate and elution from silica gel with methanol-chloroform (1:9) to give 2-hydroxymethyl-3,4-dimethoxypyridine (1.6 g).

1. waitthe mixture was left
2. additionwas added in two portions
3. customThe mixture was evaporated to dryness
4. customthe residue was purified
5. extractionby extracting a chloroform solution
6. washwith aqueous sodium bicarbonate and elution from silica gel with methanol-chloroform (1:9)