反应详情

To a solution of triphenylphosphine (3.0 equiv.) in toluene (0.25 M solution) was added DEAD (3.0 equiv.) at room temperature, which was stirred for 15 min. Then, (+/−)-benzyl 4-fluoro-3-hydroxypiperidine-1-carboxylate (1.0 equiv.) was added to the reaction mixture. After being stirred for 10 min, phthalimide (3.0 equiv.) was added and the reaction mixture was stirred for 15 h. The reaction mixture was extracted with ethyl acetate, which was washed with water and brine. The organic phase was dried over anhydrous sodium sulfate and filtered. After volatile materials were removed, (+/−)-benzyl 3-(1,3-dioxoisoindolin-2-yl)-4-fluoropiperidine-1-carboxylate was obtained by silica column chromatography (10% to 20% EtOAc in hexanes, 20%). LCMS (m/z): 383.0 (MH+), Rt=1.0 min.

1. stirringAfter being stirred for 10 min
2. stirringthe reaction mixture was stirred for 15 h
3. extractionThe reaction mixture was extracted with ethyl acetate, which
4. washwas washed with water and brine
5. dry with materialThe organic phase was dried over anhydrous sodium sulfate
6. filtrationfiltered
7. customAfter volatile materials were removed