Trifluoroacetic anhydride → HCID 12641099, compound

Participants

Reaction Steps

To a solution of compound 81 (3.2 g, 22.4 mmol) in DCM (60 mL) was added TEA (10 mL, 77 mmol) at room temperature with stirring. Then to the mixture was added dropwise TFAA (4 mL, 30.8 mmol) at 0° C. The reaction mixture was stirred at room temperature for 4 h. Then the mixture was diluted with DCM, washed by water and brine, dried over Na2SO4 and concentrated to dryness to give compound 82 (2.7 g, 93%) as a yellow oil. 1H NMR (400 MHz, CDCl3) 8.12 (d, 2H, J=8.1 Hz), 7.30 (d, 2H, J=8.1 Hz), 2.85 (t, 2H, J=7.5 Hz), 2.31 (t, 2H, J=7.3 Hz), 1.92-2.05 (m, 2H).

Provenance & Evidence