反应详情

Following the procedure described in Step 4 of Example 1, 6-[3-(2-cyclopentylethyl)-1-benzofuran-2-yl]-2-naphthol (0.671 g, 1.88 mmol) was brominated with bromine (0.11 mL, 2.2 mmol) and potassium acetate (1.91 g, 19.5 mmol) in glacial acetic acid (19 mL). Purification by flash chromatography using 100% hexane and 1-30% chloroform in hexane as eluants afforded 1-bromo-6-[3-(2-cyclopentylethyl)-1-benzofuran-2-yl]-2-naphthol as a light brown semi-solid (0.609 g). 1HNMR (300 MHz, DMSO-d6): δ10.75 (s, 1H), 8.25 (s, 1H), 8.15 (d, 1H, J=8.6 Hz), 7.95-8.0 (m, 2H), 7.7 (d, 1H, J=8.6 Hz), 7.6 (d, 1H, J=8.6 Hz), 7.25-7.4 (m, 3H), 3.0 (t, 2H, J=8.6 Hz), 1.65-1.95 (m, 5H), 1.4-1.65 (m, 4H), and 1.1-1.25 ppm (m, 2H).

1. customPurification by flash chromatography