反应详情

温度

70 °C

To a stirred suspension of copper (II) bromide (499 mg, 2.23 mmol, 2 eq.) in EtOAc is added HBr (33% in acetic acid, 0.368 ml, 2.25 mmol, 2 eq.) followed by 1-(6-methoxy-4-methyl-pyridin-3-yl)-propan-1-ol (200 mg, 1.12 mmol, 1 eq.). The mixture is heated at 70° C. for 12 hrs. After cooling to RT the mixture is poured into 2M Na2CO3 (50 ml) and extracted with EtOAc (2×50 ml). The combined extracts are washed successively with 2M Na2CO3, water and brine, dried over MgSO4, filtered, and concentrated under reduced pressure. The resulting crude residue is purified by column chromatography on silica gel eluting with 10% EtOAc/iso-hexane to yield 2-bromo-1-(6-methoxy-4-methyl-pyridin-3-yl)-propan-1-one as a clear oil. MS: m/z 257.9 [M+H]+; 1H NMR (400 MHz, CDCl3) δ 1.90 (d, 3H), 2.50 (s, 3H), 4.0 (s, 3H), 2.33 (s, 3H), 5.20 (q, 1H), 6.65 (s, 1H), 8.65 (s, 1H).

1. temperatureAfter cooling to RT the mixture
2. extractionextracted with EtOAc (2×50 ml)
3. washThe combined extracts are washed successively with 2M Na2CO3, water and brine
4. dry with materialdried over MgSO4
5. filtrationfiltered
6. concentrationconcentrated under reduced pressure
7. customThe resulting crude residue is purified by column chromatography on silica gel eluting with 10% EtOAc/iso-hexane