反应详情

温度

40 °C

To a solution of 2-bromo-4-chloro-thiophene (Gronowitz, Rosén Chemica Scripta, 1971, 1, 33) (1.50 g, 7.60 mmol) and 0.5 M solution of 6-methyl-2-pyridylzinc bromide in THF (23.00 mL, 11.39 mmol) is added Pd(PPh3)4 (0.18 g, 0.15 mmol). The solution is heated at 40° C. overnight, diluted with Et2O (50 mL), washed with sat. NH4Cl (40 mL), dried over MgSO4, filtered on concentrated. The residue is purified by ISCO column chromatography (5%-20% EtOAc/hexane gradient) furnish the title compound (0.45 g, 2.15 mmol, 28%). 1H NMR (CDCl3), δ 2.56 (s, 3H), 7.02 (d, 7.7 Hz, 1H), 7.13 (d, J=0.9 Hz, 1H), 7.36 (d, J=7.9 Hz, 1H), 7.39 (d, J=0.9 Hz, 1H), 7.54 (dd, J=7.9, 7.7, 1H).

1. washwashed with sat. NH4Cl (40 mL)
2. dry with materialdried over MgSO4
3. filtrationfiltered
4. concentrationon concentrated
5. customThe residue is purified by ISCO column chromatography (5%-20% EtOAc/hexane gradient)