反应详情

A mixture of methyl 2-(2,2-dimethylpropionylamino)-6-hydroxybenzoate (Intermediate 47, 4.57 g), propargyl bromide (80% solution in toluene, 2.03 mL) and potassium carbonate (3.74 g) in acetone (35 mL) was heated at reflux for 8 hours. After cooling, the mixture was filtered and the filtrate was concentrated in vacuo. The residue was purified by chromatography on silica, eluting with a mixture of ethyl acetate and cyclohexane, with a gradient of 5-20% to give methyl 2-(2,2-dimethylpropionylamino)-6-(prop-2-ynyloxy)benzoate (4.74 g) as an oil which crystallised on standing to give a white solid.

1. temperaturewas heated
2. temperatureat reflux for 8 hours
3. temperatureAfter cooling
4. filtrationthe mixture was filtered
5. concentrationthe filtrate was concentrated in vacuo
6. customThe residue was purified by chromatography on silica
7. washeluting with a mixture of ethyl acetate and cyclohexane, with a gradient of 5-20%