反应详情

Concentrated H2SO4 (1.0 mL) was added to a solution of 3-ethylbenzoic acid (500 mg, 3.33 mmol) in MeOH (10 mL). The mixture was heated at reflux for 18 h then cooled to room temperature. The mixture was diluted with water (50 mL) and extracted with Et2O (3×100 mL). The combined organic phase was dried (Na2SO4), filtered and concentrated in vacuo. Purification of the crude residue by chromatography on silica gel (hexanes→20% EtOAc/hexanes, gradient) afforded 500 mg (91%) of methyl 3-ethylbenzoate.

1. temperatureThe mixture was heated
2. temperatureat reflux for 18 h
3. extractionextracted with Et2O (3×100 mL)
4. dry with materialThe combined organic phase was dried (Na2SO4)
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. customPurification of the crude residue by chromatography on silica gel (hexanes→20% EtOAc/hexanes, gradient)