反应详情

To benzofuran-2-yl-methanol (4.3 g, 29.0 mmol, 1 eq., Example 140, Step 1), dichloromethane (200 mL) was added and the solution was cooled using an ice-ethanol bath. Then carbon tetrabromide (10.6 g, 31.9 mmol, 1.1 eq.) and 1,3-bis(diphenylphosphino)-propane (6.6 g, 16.0 mmol, 0.55 eq.) were added under argon, and the reaction was allowed to slowly warm to room temperature for 2.5 hours. After work-up and flash column chromatography, 2-bromomethyl-benzofuran was obtained in quantitative yield. 1H NMR (400 MHz, DMSO-d6) δ ppm 4.9 (s, 2 H) 7.0 (dd, J=5.3, 0.5 Hz, 1 H) 7.3 (dd, 1 H) 7.4 (m, 1 H) 7.6 (m, 2 H).

1. temperaturethe solution was cooled