反应详情

N-(4-(4-fluorophenyl)-5-methyl-6-isopropylpyrimidin-2-yl)-N-methylmethanesulfonamide (112.5 mg, 0.33 mmol, 1 equiv.) and N-bromosuccinimide (NBS) (118.7 mg, 0.66 mmol, 2 equiv.) were dissolved in 2 mL of acetonitrile. The mixture was irradiated with light of a wavelength A=310 nm for 4 hours at ambient temperature (about 20° C.). The obtained yellow solution was diluted with 1 mL of acetonitrile. After 2 mL of saturated NaHCO3 solution was added, the obtained mixture was further stirred under reflux for 4 hours. Then the mixture was cooled to room temperature, water (10 mL) was added and the mixture was extracted with CH2Cl2 (3×10 mL). The combined organic phases were washed with 10 mL of brine, and the obtained solution was dried with Na2SO4. Solvent was removed under the reduced pressure to give 110.8 mg (95%) of crude N-(4-(4-fluorophenyl)-5-(hydroxymethyl)-6-isopropylpyrimidin-2-yl)-N-methylmethanesulfonamide (III) which contained 77% of N-(4-(4-fluorophenyl)-5-(hydroxymethyl)-6-isopropylpyrimidin-2-yl)-N-methylmethanesulfonamide (III) as determined by 1H-NMR integral. This product can be further purified by crystallization from MTBE/hexane mixture to afford pure material (HPLC area %=99.6) with Tm=140-141° C.

1. customThe mixture was irradiated with light of a wavelength A=310 nm for 4 hours at ambient temperature (about 20° C.)
2. temperatureunder reflux for 4 hours
3. extractionthe mixture was extracted with CH2Cl2 (3×10 mL)
4. washThe combined organic phases were washed with 10 mL of brine
5. dry with materialthe obtained solution was dried with Na2SO4
6. customSolvent was removed under the reduced pressure