反应详情

3-[5-(1,1-Difluoro-ethyl)-tetrazol-1-yl]-5-(5-methyl-pyridin-2-yl)-benzoic acid methyl ester (0.605 g, 0.68 mmol) was added to a mixture of methanol (10 mL), methylene chloride (2 mL) and 3N aqueous NaOH (0.5 mL). The reaction mixture was stirred at room temperature for 18 hours, then solvent was removed under reduced pressure. The liquid residue was diluted with water and acidified to pH 5 by addition of 1N aqueous HCl. The resulting mixture was extracted with EtOAc, and the combined organic layers were washed with water, dried (MgSO4), filtered and concentrated under reduced pressure to give 0.552 g of 3-[5-(1,1-Difluoro-ethyl)-tetrazol-1-yl]-5-(5-methyl-pyridin-2-yl)-benzoic acid.

1. customsolvent was removed under reduced pressure
2. additionThe liquid residue was diluted with water
3. additionacidified to pH 5 by addition of 1N aqueous HCl
4. extractionThe resulting mixture was extracted with EtOAc
5. washthe combined organic layers were washed with water
6. dry with materialdried (MgSO4)
7. filtrationfiltered
8. concentrationconcentrated under reduced pressure