反应详情

To a solution of 1-benzyloxycarbonyl-4-benzyl-5-isopropyl-1,2-dihydro-3H-pyrazol-3-one (0.16 g) in acetonitrile (5 mL) were added potassium carbonate (0.0757 g) and 2,3,4,6-tetra-O-pivaloyl-α-D-glucopyranosyl bromide (0.278 g) successively under stirring at room temperature. In addition, the mixture was stirred at 50° C. for 4 hours. The reaction mixture was poured into water, and the resulting mixture was extracted with diethyl ether. The organic layer was washed with brine and dried over anhydrous magnesium sulfate. The insoluble materials were removed by filtration, and the filtrate was concentrated under reduced pressure. The residue was purified by column chromatography on silica gel (eluent: ethyl acetate/n-hexane=1/6) to give 1-benzyloxycarbonyl-4-benzyl-5-isopropyl-3-(2,3,4,6-tetra-O-pivaloyl-β-D-glucopyranosyl-oxy)-1H-pyrazole (0.228 g).

1. stirringIn addition, the mixture was stirred at 50° C. for 4 hours
2. extractionthe resulting mixture was extracted with diethyl ether
3. washThe organic layer was washed with brine
4. dry with materialdried over anhydrous magnesium sulfate
5. customThe insoluble materials were removed by filtration
6. concentrationthe filtrate was concentrated under reduced pressure
7. customThe residue was purified by column chromatography on silica gel (eluent: ethyl acetate/n-hexane=1/6)