反应详情

温度

0 °C

To a solution containing 402 mg (1.54 mmol) of 1,4-Dimethyl-6-octyl-2,3-dihydro-1H-pyrrolo[2,3-b]pyridine in 6 mL of chloroform was added 220 mg (0.77 mmol) of 1,3-dibromo-5,5-dimethylhydantoin in five portions at 0° C. The reaction mixture was stirred at 0° C. for 30 min. The reaction mixture was quenched by the addition of 8 mL of sat aq. NaHCO3. The mixture was extracted with three 25-mL portions of chloroform. The combined organic layer was washed with brine, dried over anhydrous MgSO4, filtered, and concentrated under diminished pressure. The residue was purified via flash chromatography on a silica gel column (43×2.5 cm). Step gradient elution with 1:10 ethyl acetate-hexanes as eluent gave 5-bromo-1,4-dimethyl-6-octyl-2,3-dihydro-1H-pyrrolo[2,3-b]pyridine as a yellow oil: yield 371 mg (71%); silica gel TLC Rf 0.65 (8:1:1 hexanes-ethyl acetate-methanol); 1H NMR (CDCl3) δ 0.81 (t, 2H, J=7.2 Hz), 1.16-1.30 (m, 10H), 1.65 (quint, 2H, J=8.0 Hz), 2.12 (s, 3H), 2.59 (t, 2H, J=8.0 Hz), 2.79-2.85 (m, 5H), 3.41 (t, 2H, J=8.0 Hz).

1. customThe reaction mixture was quenched by the addition of 8 mL of sat aq. NaHCO3
2. extractionThe mixture was extracted with three 25-mL portions of chloroform
3. washThe combined organic layer was washed with brine
4. dry with materialdried over anhydrous MgSO4
5. filtrationfiltered
6. concentrationconcentrated under diminished pressure
7. customThe residue was purified via flash chromatography on a silica gel column (43×2.5 cm)
8. washStep gradient elution with 1:10 ethyl acetate-hexanes as eluent