反应详情

温度

-78 °C

To a solution of (2,4-dichloro-pyrimidin-5-yl-methyl)-(2-fluoro-4-methoxy-phenyl)amine (1.1 g, 3.64 mmol) (from Example 17a supra) in tetrahydrofuran (50 mL) at −78° C. was added n-butyllithium (2.5 M in hexanes, 1.75 mL, 4.37 mmol) (Aldrich). After stirring at −78° C. for 40 minutes, tert-butyl-(trans-4-isocyanato-cyclohexyloxy)-dimethyl-silane (1.12 g, 4.37 mmol) (from Example 17b supra) was added. The mixture was stirred at −70° C. for 1 hour and then at room temperature for 3 hours. It was diluted with ethyl acetate, washed with brine, dried over magnesium sulfate, filtered and concentrated under reduced pressure. The residue was purified by flash chromatography eluting with ethyl acetate-hexanes (3:7 then 2:3) to give 1-[trans-4-(tert-butyl-dimethyl-silanyloxy)-cyclohexyl]-7-chloro-3-(2-fluoro-4-methoxy-phenyl)-3,4-dihydro-1H-pyrimido[4,5-d]pyrimidin-2-one. (Yield 0.60 g, 33%).

1. stirringThe mixture was stirred at −70° C. for 1 hour
2. waitat room temperature for 3 hours
3. washwashed with brine
4. dry with materialdried over magnesium sulfate
5. filtrationfiltered
6. concentrationconcentrated under reduced pressure
7. customThe residue was purified by flash chromatography
8. washeluting with ethyl acetate-hexanes (3:7