反应详情

A mixture of 5-bromo-2-tert-butyl-pyrimidine-4-carboxylic acid (1.65 g, 6.37 mmol) and aqueous sodium hydroxide (1.0 N, 19.1 mL, 19.1 mmol) in methanol (100 ml) was treated with a catalytic amount of 10% palladium on carbon. The mixture was degassed under vacuum/nitrogen, then hydrogenated at 50 psi for 2 hours. The catalyst was removed by filtration, the methanol was removed under vacuum, and the aqueous was acidified by the addition of 1.0 N aqueous hydrochloric acid (40 mL). The resulting suspension was extracted with ethyl acetate (4×50 mL), the combined organic phases were washed with brine, dried over sodium sulfate, and concentrated in-vacuo to yield 1.06 g of 2-tert-butylpyrimidine-4-carboxylic acid as a white powder. MS (ES+)=181 (M+H+).

1. customThe mixture was degassed under vacuum/nitrogen
2. customThe catalyst was removed by filtration
3. customthe methanol was removed under vacuum
4. additionthe aqueous was acidified by the addition of 1.0 N aqueous hydrochloric acid (40 mL)
5. extractionThe resulting suspension was extracted with ethyl acetate (4×50 mL)
6. washthe combined organic phases were washed with brine
7. dry with materialdried over sodium sulfate
8. concentrationconcentrated in-vacuo