反应详情

温度

25 °C

To a solution of tert-butyl 2-oxopiperidine-1-carboxylate (0.30 g, 1.51 mmol) in tetrahydrofuran (8 mL) cooled to −78° C. was added slowly over 15 minutes 0.3 M 3,4,5-trifluorophenylmagnesium bromide in tetrahydrofuran (3.30 mL, 1.66 mmol) and the mixture was then allowed to warm to 25° C. over 30 minutes. The reaction mixture was poured slowly into an ice cold solution of 0.5 N hydrochloric acid (100 mL), and extracted twice with ethyl acetate (2×50 mL). The combined organic extracts were dried over anhydrous sodium sulfate then filtered and concentrated. The residue was purified by silica gel column chromatography (diethyl ether/hexanes 1:4) to give tert-butyl 5-oxo-5-(3,4,5-trifluorophenyl)pentylcarbamate (0.18 g, 36% yield). MS (EI) for C16H20F3NO3: 332 (MH+).

1. extractionextracted twice with ethyl acetate (2×50 mL)
2. dry with materialThe combined organic extracts were dried over anhydrous sodium sulfate
3. filtrationthen filtered
4. concentrationconcentrated
5. customThe residue was purified by silica gel column chromatography (diethyl ether/hexanes 1:4)