反应详情

4.14 g (16.28 mmol) of 4-(3-fluoro-2-methoxyphenyl)-4-methyl-2-oxo-pentanoic acid is dissolved in 97 ml of ethanol, mixed with 1.79 ml of sulfuric acid and refluxed for four hours. The ethanol is drawn off in a rotary evaporator, and the residue is carefully mixed with saturated sodium bicarbonate solution until a pH of 9 is reached. It is extracted twice with 100 ml each of ethyl acetate, and the combined organic extracts are washed with water and then with brine. After the desiccant is dried and filtered off, and after the solvent is spun in, the residue is chromatographed on silica gel (mobile solvent ethyl acetate/hexane). 4.16 g (90.6%) of the desired compound is isolated.

1. temperaturerefluxed for four hours
2. customThe ethanol is drawn off in a rotary evaporator
3. additionthe residue is carefully mixed with saturated sodium bicarbonate solution until a pH of 9
4. extractionIt is extracted twice with 100 ml each of ethyl acetate
5. washthe combined organic extracts are washed with water
6. customAfter the desiccant is dried
7. filtrationfiltered off
8. customis chromatographed on silica gel (mobile solvent ethyl acetate/hexane)