To a mixture of 2-chloro-4-(4-fluoro-1H-indol-2-yl)pyrimidin-5-yl trifluoromethanesulfonate (500 mg, 1.26 mmol), tributyl(vinyl)stannane (400 mg, 1.26 mmol) and anhydrous LiCl (150 mg, 3.54 mmol) in DMF (5 mL), Pd(PPh3)2Cl2 (50 mg, 0.07 mmol) was added under N2 protection. The reaction mixture was stirred at 60° C. for 1 h. Then it was concentrated in vacuo, and the residue was purified by column chromatography (PE:EA=10:1) to give the product of 2-(2-chloro-5-vinylpyrimidin-4-yl)-4-fluoro-1H-indole (250 g, yield: 72.3%). 1H-NMR (DMSO-d6, 400 MHz) δ 12.21 (br s, 1H), 8.85 (s, 1H), 7.41 (d, J=7.6 Hz, 1H), 7.21˜7.27 (m, 1H), 7.08˜7.20 (m, 2H), 6.87 (dd, J=10.4, 7.6 Hz, 1H), 6.01 (dd, J=17.6, 1.2 Hz, 1H), 5.72 (dd, J=11.2, 1.2 Hz, 1H). MS (M+H)+: 274/276.
