反应详情

A solution of tert-butyl 1-(1-hydroxyethyl)-3,3-dimethoxycyclopentanecarboxylate (8.64 g, 31.5 mmol) in 100 mL of DCM was treated with triethylamine (8.78 mL, 63.0 mmol) followed by acetic anhydride (5.94 mL, 63.0 mmol). Then DMAP (˜200 mg) was added and the resulting mixture was stirred at rt overnight. The reaction mixture was diluted with DCM, washed twice with 1N HCl solution, once with saturated NaHCO3 solution, and once with brine. The organic layer was dried over anhydrous MgSO4, filtered, and concentrated. Purification by flash chromatography (silica, 20% ethyl acetate/hexanes) provided tert-butyl 1-[1-(acetyloxy)ethyl]-3,3-dimethoxycyclopentanecarboxylate.

1. washwashed twice with 1N HCl solution, once with saturated NaHCO3 solution
2. dry with materialThe organic layer was dried over anhydrous MgSO4
3. filtrationfiltered
4. concentrationconcentrated
5. customPurification by flash chromatography (silica, 20% ethyl acetate/hexanes)