反应详情

2-Chloro-6-methyl-benzoic acid (30 mmol, 5.22 g) and phenol (40 mmol, 3.8 g) were dissolved in a solution of NaOMe (30 wt %) in MeOH (ca. 66 mmol, 12 mL). To the solution was added copper bronze (3 mmol, 193 mg) before it was concentrated in vacuo. Then, 1,2-dichlorobenzene (24 mL) was added and the mixture was refluxed under nitrogen for 2 h with stirring. After cooling to ambient temperature water (200 mL) and Et2O (150 mL) were added and the mixture was stirred vigorously for 30 min before the organic phase was separated and discarded. The aqueous phase was washed with Et2O (150 mL) before it was acidified by addition of 5 N hydrochloric acid. The resulting mixture was extracted with ethyl acetate (1×100 mL). The organic phase was dried over MgSO4 and concentrated in vacuo. The residue was recrystallized from hexanes/toluene to give the title compound as a tan solid (4.55 g); MS-(−)-ion: M−1=226.8.

1. concentrationwas concentrated in vacuo
2. additionThen, 1,2-dichlorobenzene (24 mL) was added
3. temperaturethe mixture was refluxed under nitrogen for 2 h
4. additionwere added
5. stirringthe mixture was stirred vigorously for 30 min before the organic phase
6. customwas separated
7. washThe aqueous phase was washed with Et2O (150 mL) before it
8. additionwas acidified by addition of 5 N hydrochloric acid
9. extractionThe resulting mixture was extracted with ethyl acetate (1×100 mL)
10. dry with materialThe organic phase was dried over MgSO4
11. concentrationconcentrated in vacuo
12. customThe residue was recrystallized from hexanes/toluene