反应详情

A solution of 250 (729 mg, 3.73 mmol) and 1,3-dichloroacetone (474 mg, 3.73 mmol) in THF (30 ml) was stirred at 40° C. during 48 h. The solvent was evaporated then the residue was dissolved in ethyl acetate, washed with brine, dried over anhydrous MgSO4, filtered and concentrated. The crude residue was purified by flash chromatography on silica gel (2-4% MeOH/CH2Cl2) to afford the title compound (827 mg, 83% yield) as a white solid. 1H NMR (DMSO) δ (ppm): 12.93 (bs, 1H), 7.91 (d, J=8.1 Hz, 2H), 7.63 (s, 1H), 7.46 (d, J=8.1 Hz, 2H), 4.78 (s, 2H), 4.42 (s, 2H).

1. customThe solvent was evaporated
2. dissolutionthe residue was dissolved in ethyl acetate
3. washwashed with brine
4. dry with materialdried over anhydrous MgSO4
5. filtrationfiltered
6. concentrationconcentrated
7. customThe crude residue was purified by flash chromatography on silica gel (2-4% MeOH/CH2Cl2)