反应详情

To a suspension of 3-benzyloxy-1-methyl-2-(2,2,2-trifluoro-1-hydroxy-ethyl)-1H-pyridin-4-one (4 g) in CH2Cl2 (80 mL) was added Et3N (2.40 mL, 17.5 mmol), followed by methanesulfonyl chloride (1.25 mL, 16.2 mmol) at ice-water bath temperature. The resulting mixture was then stirred for 3 h. The reaction mixture was quenched with water and extracted twice with CH2Cl2 (2×50 mL). The combined organic fractions were washed with brine and dried over anhydrous sodium sulfate, filtered and concentrated to dryness. The residue was purified by flash column chromatography on silica gel using a mixture of CH2Cl2 and MeOH (95/5, v/v) as eluant, thereby affording the product, methanesulfonic acid 1-(3-benzyloxy-1-methyl-4-oxo-1,4-dihydro-pyridin-2-yl)-2,2,2-trifluoro-ethyl ester (0.97 g, 19.4% yield). MS-ESI (m/z): 391.9 [M+1]+, 206, 91.

1. customThe reaction mixture was quenched with water
2. extractionextracted twice with CH2Cl2 (2×50 mL)
3. washThe combined organic fractions were washed with brine
4. dry with materialdried over anhydrous sodium sulfate
5. filtrationfiltered
6. concentrationconcentrated to dryness
7. customThe residue was purified by flash column chromatography on silica gel using
8. additiona mixture of CH2Cl2 and MeOH (95/5