反应详情

To a suspension of 2-chloro-5-methyl-benzoic acid (3.0 g, 17.6 mmol) in dichloromethane (50 ml) was added a solution of oxalyl chloride in dichloromethane (2 M, 10 ml, 20 mmol) followed by N,N-dimethylformamide (5 drops). After stirring for 1 hour, methanol (20 ml) was added. After stirring for 3 hours, the mixture was concentrated under reduced pressure. The residue was partitioned between ethyl acetate (200 ml) and saturated aqueous potassium carbonate solution (100 ml). The organic layer was concentrated under reduced pressure to provide methyl 2-chloro-5-methyl-benzoate (3.2 g, 100% yield).

1. stirringAfter stirring for 3 hours
2. concentrationthe mixture was concentrated under reduced pressure
3. customThe residue was partitioned between ethyl acetate (200 ml) and saturated aqueous potassium carbonate solution (100 ml)
4. concentrationThe organic layer was concentrated under reduced pressure