Diisopropylethylamine → (E)-N-(2-(5-(3-(3,5-dichloro-4-fluorophenyl)-4,4,4-trifluorobut-1-en-1-yl)-1H-indol-1-yl)-2-oxoethyl)-3,3,3-trifluoropropanamide

Participants

Reaction Steps

To a stirred solution of (E)-2-amino-1-(5-(3-(3,5-dichloro-4-fluorophenyl)-4,4,4-trifluorobut-1-enyl)-1H-indol-1-yl) ethanone (0.04 g, 0.09 mmol) in CH2Cl2 (5.0 ml) was added 3,3,3-trifluoropropanoic acid (17.5 mg, 0.136 mmol), PyBOP (70 mg, 0.135 mmol) and DIPEA (29 mg, 0.225 mmol) and the reaction was stirred at ambient temperature for 16 h. The reaction mixture was diluted with CH2Cl2, and the CH2Cl2 layer was washed with water and saturated brine solution. The separated CH2Cl2 layer was dried over anhydrous Na2SO4 and concentrated under reduced pressure to afford the crude compound, which was purified by column chromatography (SiO2, 100-200 mesh; 10% ethyl acetate/petroleum ether) to afford the title compound as an off-white solid (30 mg, 60%): mp 121-126° C.; 1H NMR (400 MHz, CDCl3) δ 8.33 (br, 1H), 7.59 (s, 1H), 7.45 (m, 4H), 6.72 (d, J=3.6 Hz, 3H), 6.39 (m, 1H), 4.71 (t, J=7.2 Hz, 2H), 4.15 (m, 1H), 3.51 (m, 1H), 3.28 (m, 1H); ESIMS m/z 553.06 ([M−H]−).

Provenance & Evidence