反应详情

温度

-60 °C

Into a 100-mL three neck round-bottom flask, which was purged and maintained with an inert atmosphere of nitrogen, was placed a solution of 4-(trifluoromethyl)-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-imidazole (compound 216.2, 5 g, 18.77 mmol) in tetrahydrofuran (50 mL). This was followed by the addition of n-butyllithium (9 mL, 22.5 mmol, 2.5N in hexane) dropwise at −78° C. and stirred for 1 h at -60° C. To this was added dihydro-2H-pyran-4(3H)-one (6 g, 59.93 mmol). The resulting solution was stirred for 4 h at 0° C. in an ice/salt bath, then quenched with 10 mL of water. The resulting solution was diluted with 100 mL of NH4Cl (sat.). The aqueous phase was extracted with 2×100 mL of ethyl acetate. The combined organic layers were dried over anhydrous sodium sulfate and concentrated under reduced pressure. The residue was purified by silica gel chromatography with ethyl acetate/petroleum ether (1:4) as eluent to furnish 6 g (87%) of the title compound as a light yellow oil.

1. customInto a 100-mL three neck round-bottom flask, which was purged
2. temperaturemaintained with an inert atmosphere of nitrogen
3. stirringThe resulting solution was stirred for 4 h at 0° C. in an ice/salt bath
4. customquenched with 10 mL of water
5. additionThe resulting solution was diluted with 100 mL of NH4Cl (sat.)
6. extractionThe aqueous phase was extracted with 2×100 mL of ethyl acetate
7. dry with materialThe combined organic layers were dried over anhydrous sodium sulfate
8. concentrationconcentrated under reduced pressure
9. customThe residue was purified by silica gel chromatography with ethyl acetate/petroleum ether (1:4) as eluent