Реакция #82996

Уравнение реакции

octyl bromide

3,6-Dihydroxy xanthone

water

→

3-Octoxy-6-hydroxy xanthone

Выход 30.0%

Растворители

methanol

methanol

Условия реакции

Обработка

1. 1
   workup.DISSOLUTIONAfter the compound was completely dissolved
2. 2
   Температураat refluxing temperature
3. 3
   Другоеgiving a precipitate
4. 4
   ФильтрацияThis white precipitate was then filtered
5. 5
   Промывкаwashed with water
6. 6
   Промывкаwashed with hot hexane
7. 7
   Другоеto remove the disubstituted side product

Методика

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).

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