反应详情

To a solution of (R)-tert-butyl 2-(3-cyano-5-fluorophenyl)-4,4-difluoropyrrolidine-1-carboxylate (I-23) (0.45 g, 1.4 mmol) in DCM (3 mL) was added TFA (3 mL) and stirred at room temperature for 1 hour. All the solvents were removed under reduced pressure. The crude was diluted with EtOAc, washed with aqueous NaHCO3 and brine, dried over sodium sulfate, filtered and concentrated to yield (R)-3-(4,4-difluoropyrrolidin-2-yl)-5-fluorobenzonitrile (I-24) as a light yellow oil. 1H NMR (400 MHz, CDCl3) δ 7.52 (s, 1 H), 7.42 (d, J=9.2 Hz, 1 H), 7.29-7.26 (m, 1 H), 4.46 (t, J=8.8 Hz, 1 H), 3.52-3.30 (m, 2 H), 2.74-2.60 (m, 1 H), 2.20-2.04 (m, 1 H), 1.90 (bs, 1 H). MS m/z 227.1 (M+1)+.

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