反应详情

温度

-70 °C

2-Anilino-4-(1,2-dimethylimidazol-5-yl)pyrimidine (Method 74; 2 g, 7.55 mmol) was dissolved in anhydrous THF (100 ml) at RT under a nitrogen atmosphere. The stirring solution was cooled using dry-ice/acetone bath to −70° C. A 1.6M solution of n-butyl lithium in hexane (6.3 ml, 10.08 mmol) was added drop-wise keeping temperature <−60° C. until the dark red colour remained. One more equivalent of n-butyl lithium in hexane (4.7 ml, 7.55 mmol), was then added dropwise keeping the temperature below −60° C. At this point the solution stirred at −70° C. for 10 minutes when propyl iodide (809 μl, 8.29 mmol) was added, the temperature was maintained at −70° C. for an additional 10 minutes then allowed to rise to RT. The reaction was allowed to stir for 1 hr at room temperature when water (100 ml) was added. The aqueous layer extracted with EtOAc (2×20 ml). Organics were combined, dried solvent evaporated in vacuo. The residue was purified by flash silica chromatography DCM:MeOH (95:5) to yield the title compound (1.03 g, 45%) as a pure white solid NMR: 0.90 (t, 3H), 1.39 (m, 2H), 1.66 (m, 2H), 2.70 (t, 2H), 3.94 (s, 3H), 6.95 (t, 1H), 7.08 (d, 1H), 7.28 (t, 2H, 7.65 (d, 2H), 7.59 (s, 1H), 8.35 (d, 1H), 9.42 (s, 1H); m/z 308.

1. temperatureThe stirring solution was cooled
2. customto −70° C
3. customtemperature <−60° C.
4. customthe temperature below −60° C
5. additionwas added
6. customto rise to RT
7. additionwas added
8. extractionThe aqueous layer extracted with EtOAc (2×20 ml)
9. customdried solvent evaporated in vacuo
10. customThe residue was purified by flash silica chromatography DCM:MeOH (95:5)