反应详情

5-Methoxy-2-methylsulfanyl-pyrimidin-4-ol (250 mg) is dissolved in acetonitrile (7 ml) and thereto are added phosphorus oxychloride (0.7 ml) and N,N-diethyl aniline (460 μl) and the mixture is heated under reflux for 5.5 hours. The reaction solution is evaporated azeotropically with toluene three times, and to the residue are added aqueous citric acid solution and chloroform, and the mixture is separated. The organic layer is washed with a saturated brine, dried over magnesium sulfate, and concentrated under reduced pressure. The resulting residue is purified by silica gel column chromatography (hexane:ethyl acetate=19:1→17:3) to give 4-chloro-5-methoxy-2-methylsulfanyl-pyrimidine (260 mg). MS (m/z): 191/193 [M+H]+

1. temperaturethe mixture is heated
2. temperatureunder reflux for 5.5 hours
3. customThe reaction solution is evaporated azeotropically with toluene three times
4. additionto the residue are added aqueous citric acid solution and chloroform
5. customthe mixture is separated
6. washThe organic layer is washed with a saturated brine
7. dry with materialdried over magnesium sulfate
8. concentrationconcentrated under reduced pressure
9. customThe resulting residue is purified by silica gel column chromatography (hexane:ethyl acetate=19:1→17:3)