반응 #1973909

반응 방정식

Ethyl 2-oxocyclohexanecarboxylate

Bromine

→

3-Bromo-2-hydroxy-1-enecarboxylic

수율 94.4%

3-Bromo-2-hydroxy-cyclohex-1-enecarboxylic acid ethyl ester

수율 94.4%

용매

diethyl ether

반응 조건

후처리

1. 1
   온도to warm to RT over 90 min
2. 2
   추출extracted with ethyl acetate (3×200 mL)
3. 3
   건조The combined organic layers were dried over magnesium sulfate
4. 4
   여과filtered
5. 5
   농축concentrated in vacuo
6. 6
   기타dried on the vacuum line for 18 h

실험 절차

Ethyl 2-oxocyclohexanecarboxylate (30 g, 176 mmol, 28 mL) was dissolved in diethyl ether (30 mL) and cooled to 0° C. under nitrogen. Bromine (28 g, 176 mmol, 9.0 mL) was added dropwise over 15 min and the reaction mixture was allowed to warm to RT over 90 min. The mixture was slowly poured into ice-cold saturated aqueous potassium carbonate (250 mL) and extracted with ethyl acetate (3×200 mL). The combined organic layers were dried over magnesium sulfate, filtered, concentrated in vacuo and dried on the vacuum line for 18 h to afford 41.4 g (94%) of 3-Bromo-2-hydroxy-1-enecarboxylic acid ethyl ester (4) as a yellow oil. The structure was confirmed by 13C NMR (75 MHz, CDCl3): δC 14.1, 17.7, 21.8, 32.0, 60.0, 60.8, 99.7, 166.3, and 172.8.

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