反応 #1954011

反応方程式

3-chloro-2-hydroxybenzaldehyde

vinyl magnesium chloride

ammonium chloride

→

2-chloro-6-(1-hydroxy-2-propenyl)phenol

溶媒

THF

THF

反応条件

後処理

1. 1
   温度The mixture was cooled to 0° C.
2. 2
   その他at 0° C
3. 3
   抽出The mixture was extracted with ethyl acetate
4. 4
   洗浄successively washed with water
5. 5
   乾燥by drying with anhydrous sodium sulfate
6. 6
   その他The solid was removed by filtration
7. 7
   濃縮the filtrate was concentrated
8. 8
   その他to obtain a brown oil
9. 9
   その他This oil was purified by silica gel column chromatography (elution with hexane:ethyl acetate=5:1)

実験手順

After a solution of 3-chloro-2-hydroxybenzaldehyde (15.4 g, 98 mmol) in THF (100 ml) was cooled to 0° C., a solution of vinyl magnesium chloride in THF (1.9M, 126 ml, 240 mmol) was added thereto over 40 minutes. The mixture was gradually warmed to room temperature and stirred at room temperature for 14 hours. The mixture was cooled to 0° C. and a 20% aqueous ammonium chloride solution (200 ml) was added thereto at 0° C. The mixture was extracted with ethyl acetate. The organic layer was combined and successively washed with water and a saturated aqueous NaCl solution, followed by drying with anhydrous sodium sulfate. The solid was removed by filtration and the filtrate was concentrated to obtain a brown oil. This oil was purified by silica gel column chromatography (elution with hexane:ethyl acetate=5:1) to obtain 15.1 g of 2-chloro-6-(1-hydroxy-2-propenyl)phenol as a pale brown oil. 1H-NMR (500 MHz, CDCl3)•ppm: 7.28 (1H, dd, J=7.7 and 1.1 Hz), 7.16 (1H, s), 7.08 (1H, dd, J=7.7 and 1.1 Hz), 6.84 (1H, t, J=7.7 Hz), 6.12 (1H, ddd, J=17.0, 10.4, and 6.0 Hz), 5.44 (1H, d, J=4.4 Hz), 5.36 (1H, dt, J=17.0 and 1.1 Hz), 5.26 (1H, dt, J=10.4 and 1.1 Hz), 2.63 (1H, d, J=3.3 Hz).

出典