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温度

0 °C

In a 500 ml flame-dried flask, N-phenethyl-acetamide (6.53 g, 40.0 mmol) was dissolved in methylene chloride (65 ml), and acetyl chloride (7.22 g, 92.0 mmol) was added in one portion. The resulting solution was cooled to about 0° C., and aluminum chloride (18.1 g, 136 mmol) was added in portions over about thirty minutes. The solution was stirred for about five minutes at about 0° C., and the ice bath was then removed and the mixture was heated to reflux for about thirty minutes. After cooling to room temperature, the reaction mixture was poured over ice water, stirred for about ten minutes, and then extracted with methylene chloride (2×100 ml). The combined organic extracts were then washed sequentially with water and brine, dried over magnesium sulfate, filtered, and concentrated in vacuo. The resulting white solid (7.52 g, 92% yield) was ascertained to be about 90% pure by NMR, and was employed directly without further purification. LRMS ([M+H]+)=206.2.

1. customIn a 500 ml flame-dried flask
2. customthe ice bath was then removed
3. temperaturethe mixture was heated
4. temperatureto reflux for about thirty minutes
5. temperatureAfter cooling to room temperature
6. additionthe reaction mixture was poured over ice water
7. stirringstirred for about ten minutes
8. extractionextracted with methylene chloride (2×100 ml)
9. washThe combined organic extracts were then washed sequentially with water and brine
10. dry with materialdried over magnesium sulfate
11. filtrationfiltered
12. concentrationconcentrated in vacuo