反应详情

To a solution of ethyl 4-oxo-2-(2,2,2-trifluoroacetyl)valerate (40 g, 167 mmol) in toluene (250 ml) was added p-toluenesulfonic acid (3 g, 16 mmol) and the mixture was heated under reflux overnight in a Dean-Stark apparatus under dehydrated conditions. The reaction solution was concentrated. The residue was purified by silica gel column chromatography (hexane:ethyl acetate=10:1) to give ethyl 5-methyl-2-(trifluoromethyl)-3-furancarboxylate (25.8 g, 70%).

1. temperaturethe mixture was heated
2. temperatureunder reflux overnight in a Dean-Stark apparatus under dehydrated conditions
3. concentrationThe reaction solution was concentrated
4. customThe residue was purified by silica gel column chromatography (hexane:ethyl acetate=10:1)