反应详情

温度

40 °C

2 g of 5 are dissolved in 20 ml of methyl tert-butyl ether and, with 100 mg of tetrabutylammonium fluoride trihydrate and 1.3 ml of bistrimethylsilylacetamide, heated at 40° C. for about 1 h. The reaction is monitored by thin-layer chromatography. After the reaction has ended, initially 0.2 ml of glacial acetic acid is added, and the mixture is stirred for 30 min and concentrated. The residue is treated with 20 ml of a mixture of isopropanol/2N sulfuric acid=10:1 and stirred for 1 hour. Following the addition of a spatula tip of solid sodium bicarbonate, the mixture is once more concentrated under reduced pressure, the residue is taken up in ethyl acetate, the org. phase is washed with water and dried and the residue is, after removal of the solvent, purified by column chromatography (SiO2, CH2Cl2/methanol=100:1). This gives 6 of molecular weight 418.45 (C25H20F2N2O2); MS (DCl+): 419 (M+H+).

1. concentrationconcentrated
2. additionThe residue is treated with 20 ml of a mixture of isopropanol/2N sulfuric acid=10:1
3. stirringstirred for 1 hour
4. additionthe addition of a spatula tip of solid sodium bicarbonate
5. concentrationthe mixture is once more concentrated under reduced pressure
6. washphase is washed with water
7. customdried
8. customafter removal of the solvent
9. custompurified by column chromatography (SiO2, CH2Cl2/methanol=100:1)
10. customThis gives 6 of molecular weight 418.45 (C25H20F2N2O2)