반응 #337400

반응 방정식

4-methylcatechol

cesium carbonate

dichloromethane

→

desired product

5-Methyl-benzo[1,3]dioxole

용매

dimethylformamide

반응 조건

후처리

1. 1
   기타purged with nitrogen three times
2. 2
   온도After cooling to ambient temperature
3. 3
   기타the reaction was quenched with water (500 mL)
4. 4
   추출extracted with ether-pentane (1:1 ratio, 3×500 mL)
5. 5
   세척The combined organic layers were washed with water (3×1000 mL)
6. 6
   건조dried over anhydrous magnesium sulfate
7. 7
   여과filtered
8. 8
   농축concentrated in vacuo

실험 절차

4-methylcatechol (15 g, 120.9 mmol) was added to a suspension of cesium carbonate (50 g, 154 mmol) in dimethylformamide (60 mL). The mixture was put under vacuum and purged with nitrogen three times. At ambient temperature, dichloromethane (15.4 g, 181.3 mmol) was added, and then the reaction mixture was heated at about 110° C. for about 2 hours. After cooling to ambient temperature, the reaction was quenched with water (500 mL) and extracted with ether-pentane (1:1 ratio, 3×500 mL). The combined organic layers were washed with water (3×1000 mL), dried over anhydrous magnesium sulfate, filtered and concentrated in vacuo to afford the desired product (50 g, 30%). 1H NMR (300 MHz, CDCl3) δ 6.71-6.59 (m, 3H), 5.88 (s, 2H), 2.27 (s, 3H); GC-MS: m/z=136 (MH)+.

출처