Ethyl Acetate → 2-(5-bromo-2-vinylpyridin-3-yl)-4-fluoro-1H-indole

Participants

Reaction Conditions

Reaction Steps

A mixture of 5-bromo-3-(4-fluoro-1H-indol-2-yl)pyridin-2-yl trifluoromethanesulfonate (700 mg, 1.59 mmol), tributyl(vinyl)stannane (556 mg, 1.75 mmol), LiCl (202 mg, 4.78 mmol) and Pd(PPh3)2Cl2 (100 mg) in DMF (20 mL) was stirred at 60° C. for 3 hours under nitrogen atmosphere. The mixture was filtered through celite and concentrated in vacuo to remove DMF, and then the residue was suspended in water/EA. After extracted with EA, the combined organic phase was washed with brine, dried over sodium sulfate and concentrated to afford 2-(5-bromo-2-vinylpyridin-3-yl)-4-fluoro-1H-indole (400 mg, yield: 79%) through the column chromatography (PE:EA=20:1). 1H-NMR (CDCl3, 400 MHz) δ 8.64 (s, 1H), 8.46 (s, 1H), 7.93 (s, 1H), 7.14˜7.22 (m, 2H), 7.00˜7.07 (m, 1H), 6.82˜6.86 (m, 1H), 6.76 (s, 1H), 6.43˜6.47 (m, 1H), 5.54˜5.58 (m, 1H). MS (M+H)+: 317/319.

Provenance & Evidence