反応 #50058

反応方程式

hydrochloric acid

4-acetylbenzoic acid ethyl ester

ammonium acetate

sodium cyanoborohydride

→

1-(4-carboxyphenyl)ethylamine

溶媒

methanol

反応条件

後処理

1. 1
   温度cooled to 4°
2. 2
   その他The methanol is removed under reduced pressure
3. 3
   ろ過the suspension that remains is filtered
4. 4
   洗浄The aqueous tiltrate is washed with diethyl ether
5. 5
   workup.ADDITIONadjusted to a pH of 10 at 4° by the addition of solid sodium hydroxide
6. 6
   抽出extracted with diethyl ether
7. 7
   その他Drying
8. 8
   濃縮is followed by concentration to dryness by evaporation under reduced pressure
9. 9
   workup.DISTILLATIONthe oil that remains is distilled under reduced pressure

実験手順

10 g of 4-acetylbenzoic acid ethyl ester and 40 g of ammonium acetate are dissolved in 210 ml of absolute methanol, and 3.63 g of sodium cyanoborohydride are added. The reaction solution is stirred for 24 hours at room temperature, cooled to 4° and adjusted to a pH of 1 by the addition of concentrated hydrochloric acid. The methanol is removed under reduced pressure and the suspension that remains is filtered. The aqueous tiltrate is washed with diethyl ether, adjusted to a pH of 10 at 4° by the addition of solid sodium hydroxide and extracted with diethyl ether. Drying is carried out over sodium sulfate and is followed by concentration to dryness by evaporation under reduced pressure, and the oil that remains is distilled under reduced pressure to give 1-(4-carboxyphenyl)ethylamine having a boiling point of 130°-140° (6×10-2 mbar).

出典