To a mixture of 6-chloro-2-(5-fluoro-1H-indol-2-yl)pyridin-3-yl trifluoromethanesulfonate (200 mg, 0.51 mmol), tributyl(vinyl)stannane (170 mg, 0.54 mmol) and anhydrous LiCl (70 mg, 1.65 mmol) in DMF (2 mL), Pd(PPh3)2Cl2 (30 mg, 0.04 mmol) was added under N2 protection. The reaction mixture was stirred at 50° C. for 1 h. Then it was filtered and concentrated in vacuo, the residue was purified by column chromatography (PE: EA=20:1) to give the product of 2-(6-chloro-3-vinylpyridin-2-yl)-5-fluoro-1H-indole (100 mg, yield: 72.4%). 1H-NMR (CDCl3, 400 MHz) δ 11.67 (br s, 1H), 8.05 (d, J=8.4 Hz, 1H), 7.45˜7.55 (m, 2H), 7.38 (d, J=10.0 Hz, 1H), 7.15 (dd, J=17.2, 11.2 Hz, 1H), 7.00˜7.06 (m, 1H), 6.84 (d, J=2.0 Hz, 1H), 5.93 (d, J=17.2 Hz, 1H), 5.59 (d, J=11.2 Hz, 1H). MS (M+H)+: 273/275.
