反应详情

6-(2-Fluoro-4-nitrophenoxy)pyrimidin-4-ylamine (400 mg) was dissolved in tetrahydrofuran (16 ml) under a nitrogen atmosphere, and then triethylamine (0.669 ml) and phenyl chloroformate (0.602 ml) were added dropwise thereto while cooling in an ice bath, followed by warming the reaction mixture to room temperature and stirring for 10 min. The reaction mixture was partitioned between ethyl acetate (30 ml) and a saturated aqueous solution of sodium hydrogencarbonate (20 ml). The organic layer was washed with a saturated aqueous solution of sodium hydrogencarbonate (20 ml), water (20 ml) and brine (20 ml) in this order, and dried over anhydrous sodium sulfate. The solvent was evaporated to give a residue, which was then purified by silica gel column chromatography (Fuji Silysia NH, eluent; ethyl acetate). Fractions containing the target compound were concentrated to give a residue, which was then suspended in diethyl ether (4 ml)-hexane (4 ml). The solid was filtered and dried under aeration to provide the titled compound (396 mg, 66.8%) as pale yellow powder.

1. temperaturewhile cooling in an ice bath
2. customThe reaction mixture was partitioned between ethyl acetate (30 ml)
3. washThe organic layer was washed with a saturated aqueous solution of sodium hydrogencarbonate (20 ml), water (20 ml) and brine (20 ml) in this order
4. dry with materialdried over anhydrous sodium sulfate
5. customThe solvent was evaporated
6. customto give a residue, which
7. customwas then purified by silica gel column chromatography (Fuji Silysia NH, eluent; ethyl acetate)
8. additionFractions containing the target compound
9. concentrationwere concentrated
10. customto give a residue, which
11. filtrationThe solid was filtered
12. customdried under aeration