反应详情

To a suspension of methyl 4-oxo-4,5,6,7-tetrahydro-benzofuran-2-ylcarboxylate (5.60 g, 28.8 mmol) in CCl4 (200 ml) were added N-bromosuccinimide (5.18 g, 28.8 mmol) and 2,2′-azobisisobutyronitrile (0.483 g, 2.88 mmol). The reaction mixture was heated at reflux for 80 min and concentrated in vacuo. The residue was suspended in ethyl acetate (200 ml), washed with saturated sodium bicarbonate solution (2×50 ml), brine (50 ml), dried over sodium sulfate, filtered, and concentrated in vacuo. The crude product was purified by flash chromatography over silica gel with ethyl acetate/hexane (1/10) to yield methyl 4-hydroxy-benzofuran-2-ylcarboxylate as a while solid (4.21 g, 21.9 mmol).

1. temperatureThe reaction mixture was heated
2. temperatureat reflux for 80 min
3. concentrationconcentrated in vacuo
4. washwashed with saturated sodium bicarbonate solution (2×50 ml), brine (50 ml)
5. dry with materialdried over sodium sulfate
6. filtrationfiltered
7. concentrationconcentrated in vacuo
8. customThe crude product was purified by flash chromatography over silica gel with ethyl acetate/hexane (1/10)