反应 #82996

反应方程式

octyl bromide

3,6-Dihydroxy xanthone

water

→

3-Octoxy-6-hydroxy xanthone

收率 30.0%

溶剂

methanol

methanol

反应条件

后处理

1. 1
   workup.DISSOLUTIONAfter the compound was completely dissolved
2. 2
   温度at refluxing temperature
3. 3
   其他giving a precipitate
4. 4
   过滤This white precipitate was then filtered
5. 5
   洗涤washed with water
6. 6
   洗涤washed with hot hexane
7. 7
   其他to remove the disubstituted side product

实验过程

3,6-Dihydroxy xanthone (1,20 mmol) was dissolved in hot mixture of basic water (80 mmol of Na2CO3 in 100 ml of water) and 50 ml of methanol. After the compound was completely dissolved, a methanol solution of octyl bromide (40 mmol in 50 ml of methanol) was added dropwise and the reaction mixture was stirred rigorously for 120 hours at refluxing temperature. The reaction mixture was cooled to room temperature giving a precipitate. This white precipitate was then filtered, washed with water, and washed with hot hexane to remove the disubstituted side product. 3-Octoxy-6-hydroxy xanthone was obtained in 30% yield. 1HNMR (DMSO): d11.0(1H,s), 8.05 (1H,d,J=6.0 Hz), 8.02 (1H,d,J=5.8 Hz), 7.08 (1H,s), 7.00 (1H,d,J=8.8 Hz), 6.89 (1H,d,J=8.8 Hz), 6.85 (1H,s), 4.43 (2H,t,J=6.2 Hz), 1.8(2H,M), 1.3 (10H,m), 0.9 (3H,t).

来源