反应详情

2-Methyl-thiophene-3-carbonitrile [see Beaton, et al.; Tetrahedron Lett. 39, 10, 1998, 1227-1230] (1.36 g, 11 mmol), N-bromosuccinimide (2.56 g, 14.4 mmol), and a catalytic amount of benzoyl peroxide were stirred in benzene (30 mL) at 80° C. for 2h. The solution was diluted with EtOAc, washed with sat. NaHCO3 and brine, dried (MgSO4), and concentrated in vacuo. Purification by silica gel chromatography (10% EtOAc/hexanes) gave 1.03 g (46%) of the title compound as a white solid. 1H NMR (400 MHz, CDCl3): 7.39 (d, 1H, J=5.6 Hz), 7.17 (d, 1H, J=5.6 Hz), 4.79 (s, 2H).

1. washwashed with sat. NaHCO3 and brine
2. dry with materialdried (MgSO4)
3. concentrationconcentrated in vacuo
4. customPurification by silica gel chromatography (10% EtOAc/hexanes)