反应详情

温度

134 °C

A mixture of sodium acetate (1.0 g, 12.19 mmol), bromoacetaldehyde dimethyl acetal (1.43 mL, 12.19 mmol), and tetrabutylammoniumbromide (1.96 g, 6.09 mmol) in 8 mL of anhydrous CH3CN was stirred at 134° C. for 16 h in a sealed tube. It was cooled to room temperature, water was added and the mixture extracted with Et2O (3×100 mL). The combined organic phases were washed with saturated NaCl (1×75 mL), dried over Na2SO4, filtered and concentrated in vacuo. The residue was purified by flash chromatography on silica gel using 40-60% ethyl acetate/hexanes to give the product 43b (product is volatile, some of the product is lost during the evaporation of solvents). 1H NMR (400 MHz, CDCl3) δ 2.03 (s, 3H), 3.36 (s, 6H), 4.08 (d, J=5.3 Hz, 2H), 4.54 (t, J=5.3 Hz, 1H).

1. temperatureIt was cooled to room temperature
2. extractionthe mixture extracted with Et2O (3×100 mL)
3. washThe combined organic phases were washed with saturated NaCl (1×75 mL)
4. dry with materialdried over Na2SO4
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. customThe residue was purified by flash chromatography on silica gel using 40-60% ethyl acetate/hexanes