反应详情

温度

190 °C

2-(4-bromophenyl)-N-hydroxyacetamidine (5.0 g, 21.8 mmol) and ethyl propiolate (2.4 mL, 24.0 mmol) were dissolved in EtOH (100 mL, 2 mol). The mixture was heated to reflux for 7 hours, cooled and then concentrated. The residue was then dissolved in diphenyl ether (75 mL, 470 mmol), heated at 190° C. for 2 hours, cooled, combined with 400 mL of hexanes, and allowed to sit overnight. The solvent was decanted and the precipitant was dissolved in DCM and purified by column chromatography (0-10% MeOH in DCM) to yield 2-(4-bromobenzyl)-1H-imidazole-4-carboxylic acid ethyl ester (3.3 g).

1. temperatureThe mixture was heated
2. temperatureto reflux for 7 hours
3. temperaturecooled
4. concentrationconcentrated
5. temperaturecooled
6. customThe solvent was decanted
7. dissolutionthe precipitant was dissolved in DCM
8. custompurified by column chromatography (0-10% MeOH in DCM)