반응 #1467729

반응 방정식

4-Chloro-1-(4-methoxy-3-methylbenzyl)-2-phenylimidazole-5-acetic acid

water

→

4-chloro-1-(4-hydroxy-3-methylbenzyl)-2-phenylimidazole-5-acetic acid

수율 14.2%

용매

ethyl acetate

hydrobromic acid

반응 조건

후처리

1. 1
   세척washed with water
2. 2
   기타The ethyl acetate layer was evaporated to dryness
3. 3
   기타the residue was purified by column chromatography
4. 4
   기타crystallized from acetone-diethyl ether

실험 절차

4-Chloro-1-(4-methoxy-3-methylbenzyl)-2-phenylimidazole-5-acetic acid (2.2 g) was stirred in 20 ml of 57% hydrobromic acid at 100°-110° C. for 2 hours. To the reaction mixture was then added 80 ml of water and the mixture was allowed to stand. The resulting syrupy precipitate was dissolved in 50 ml of ethyl acetate and washed with water. The ethyl acetate layer was evaporated to dryness and the residue was purified by column chromatography using 50 g of silica gel. The desired fractions were combined and crystallized from acetone-diethyl ether to give 0.3 g of 4-chloro-1-(4-hydroxy-3-methylbenzyl)-2-phenylimidazole-5-acetic acid as colorless needles, m.p. 190°-193° C. (decompn.).

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