Trifluoroacetic acid → (E)-5-(3-(3,5-Dichloro-4-fluorophenyl)-4,4,4-trifluorobut-1-enyl)indoline

Participants

Reaction Steps

To a stirred solution of (E)-tert-butyl-5-(3-(3,5-dichloro-4-fluorophenyl)-4,4,4-trifluorobut-1-enyl)indoline-1-carboxylate (0.2 g, 0.4 mmol) in CH2Cl2 (10.0 mL) was added TFA (0.6 mL) and the reaction was stirred at ambient temperature for 2 h. The reaction mixture was diluted with CH2Cl2, washed with saturated aq NaHCO3, water and brine solution. The separated CH2Cl2 layer was dried over anhydrous Na2SO4 and concentrated under reduced pressure to afford the crude product as a light brown gummy material which was used in the next step without further purification (0.12 g): 1H NMR (400 MHz, CDCl3) δ 7.33 (d, J=6.4 Hz, 2H), 7.21 (s, 1H), 7.02 (d, J=8.0 Hz, 1H), 6.57 (d, J=8.4 Hz, 1H), 6.49 (d, J=15.6 Hz, 1H), 6.21 (dd, J=15.6, 8.4 Hz, 1H), 4.07 (m, 1H), 3.61 (t, J=8.4 Hz, 2H), 3.05 (t, J=8.4 Hz, 2H); ESIMS m/z 389.89 ([M+H]+); IR (thin film) 3385, 1112, 816 cm−1.

Provenance & Evidence