反应详情

To a solution of (2R,4S)-tert-butyl 4-fluoro-2-(3-fluorophenyl)pyrrolidine-1-carboxylate (I-5A) (890 mg, 3.14 mmol) in DCM (5 mL) at room temperature was added TFA (5 mL). The mixture was stirred at room temperature for 2 hours. All the solvents were removed under reduced pressure. The crude was extracted with EtOAc, washed with aqueous NaHCO3 and brine, dried over sodium sulfate, filtered and concentrated to yield (2R,4S)-4-fluoro-2-(3-fluorophenyl)pyrrolidine (I-6). 1H NMR (400 MHz, CDCl3) δ 7.31-7.25 (m, 1 H), 7.15-7.10 (m, 2 H), 6.96-6.90 (m, 1 H), 5.29 (d, J=53.6 Hz 1 H), 4.50 (dd, J=9.6, 6.4 Hz, 1 H), 3.43-3.33 (m, 1 H), 3.31-3.28 (m, 1 H), 2.51 (ddd, J=21.2, 14.0, 6.4 Hz, 1 H), 2.23 (bs, 1 H), 1.79 (dddd, J=39.6, 14.4, 10.0, 4.4 Hz, 1 H). MS m/z 184.1 (M+1)+.

1. customAll the solvents were removed under reduced pressure
2. extractionThe crude was extracted with EtOAc
3. washwashed with aqueous NaHCO3 and brine
4. dry with materialdried over sodium sulfate
5. filtrationfiltered
6. concentrationconcentrated