反应详情

5-(3-Chloro-2-fluorobenzyl)-2-fluoro-4-methoxybenzoic acid (10 g) obtained in Step IV was suspended in toluene (50 ml), and thionyl chloride (4.56 g) was added dropwise at 65-75° C. After the dropwise addition, the mixture was stirred for 1 hr and concentrated under reduced pressure. Toluene (30 ml) was added to the residue, and the mixture was concentrated again under reduced pressure. The residue was dissolved in toluene (30 ml) to give a solution of 5-(3-chloro-2-fluorobenzyl)-2-fluoro-4-methoxybenzoyl chloride in toluene. This was identified as the title compound by HPLC.

1. additionAfter the dropwise addition
2. concentrationconcentrated under reduced pressure
3. additionToluene (30 ml) was added to the residue
4. concentrationthe mixture was concentrated again under reduced pressure
5. dissolutionThe residue was dissolved in toluene (30 ml)