反応 #518964

反応方程式

4-Chromanol

acetic anhydride

hydrogen

→

title product

収率 85.1%

Chroman

収率 85.1%

溶媒

acetic acid

反応条件

後処理

1. 1
   ろ過The catalyst was filtered through a pad of Arbocel
2. 2
   その他the filtrate evaporated to low (5 ml) volume
3. 3
   workup.DISSOLUTIONThe remaining liquid was dissolved in EtOAc (30 ml)
4. 4
   洗浄washed with water
5. 5
   乾燥The organic layer was dried over MgSO4
6. 6
   その他evaporated to a pale yellow oil

実験手順

4-Chromanol (Aldrich) (2.77 g, 18.4 mmol) was taken up in acetic anhydride (3.5 ml, 36.9 mmol) and acetic acid (30 ml) and refluxed for 3 h, and then allowed to cool to room temperature over 16 h. 10% w/w Pd/C was then added to the solution and the whole hydrogenated at 40 p.s.i. hydrogen pressure for 16 h. The catalyst was filtered through a pad of Arbocel and the filtrate evaporated to low (5 ml) volume. The remaining liquid was dissolved in EtOAc (30 ml) and washed with water, then NaHCO3 solution (100 ml of each). The organic layer was dried over MgSO4 and evaporated to a pale yellow oil. This oil was columned in 10% EtOAc/pentane to give the title product (2.1 g, 85%); 1HNMR (400 MHz, CDCl3) δ: 1.93-2.04 (m, 2H), 2.79 (t, 2H), 4.18 (t, 2H), 6.78-6.83 (m, 2H), 7.00-7.10 (m, 2H).

出典