反応 #1464151

反応方程式

Triethylsilane

4-tert-butyl-5-hydroxy-2-octylbenzofuran

trifluoroacetic acid

→

4-tert-butyl-5-hydroxy-2-octyl-2,3-dihydrobenzofuran

収率 83.0%

反応条件

後処理

1. 1
   workup.WAITat room temperature for 1 h.
2. 2
   抽出subjected to extraction with ethyl acetate
3. 3
   洗浄The organic layer was washed with a saturated aqueous solution of sodium hydrogen carbonate
4. 4
   乾燥dried over anhydrous magnesium sulfate
5. 5
   濃縮concentrated
6. 6
   その他The concentrate was purified by silica gel chromatography (chloroform)

実験手順

Triethylsilane (2.8 ml) was added to 4-tert-butyl-5-hydroxy-2-octylbenzofuran (300 mg, 1.0 mmol) and, then, trifluoroacetic acid (1.4 ml) was added dropwise under ice cooling. The mixture was stirred first at 0° C. for 15 min, then at room temperature for 1 h., Thereafter, the mixture was poured into ice water and subjected to extraction with ethyl acetate. The organic layer was washed with a saturated aqueous solution of sodium hydrogen carbonate, dried over anhydrous magnesium sulfate and concentrated. The concentrate was purified by silica gel chromatography (chloroform) to afford 4-tert-butyl-5-hydroxy-2-octyl-2,3-dihydrobenzofuran [252 mg (yield, 83%)] as a colorless oil.

出典