反应详情

To impure 293 (0.76 g, 1.6 mmol) in EtOH (75 mL) was added zinc dust (1.04 g, 15.9 mmol), iron filings (0.89 g, 16 mmol) and saturated aqueous ammonium chloride solution (2 mL). The resultant mixture was heated to reflux for 18 h, then cooled, filtered through celite, concentrated and re-dissolved in dichloromethane. The solution was washed with water, 1 M NaOH, and brine, dried (anhydrous MgSO4), filtered, concentrated and the residue was purified by silica gel chromatography (15% MeOH/chloroform) to afford title compound 294 (0.33 g, 46% yield). MS (M+H): 449.2

1. temperatureto reflux for 18 h
2. temperaturecooled
3. filtrationfiltered through celite,
4. concentrationconcentrated
5. dissolutionre-dissolved in dichloromethane
6. washThe solution was washed with water, 1 M NaOH, and brine
7. dry with materialdried (anhydrous MgSO4)
8. filtrationfiltered
9. concentrationconcentrated
10. customthe residue was purified by silica gel chromatography (15% MeOH/chloroform)