反应详情

To a solution of 1-acetyl-4-benzyl-1,2-dihydro-5-isopropyl-3H-pyrazol-3-one (1.26 g) in acetonitrile (20 mL) were added potassium carbonate (1.01 g) and 2,3,4,6-tetra-O-pivaloyl-β-D-glucopyranosyl bromide (2.96 g) under stirring at room temperature. In addition, the mixture was heated to 50° C. and stirred for 3 hours. After the completion of the reaction, the insoluble material was removed by filtration. The filtrate was concentrated under reduced pressure. The residue was purified by column chromatography on silica gel (eluent: n-hexane/ethyl acetate=10/1) to give 1-acetyl-4-benzyl-5-isopropyl-3-(2,3,4,6-tetra-O-pivaloyl-β-D-glucopyranosyl-oxy)-1H-pyrazole (2.68 g).

1. temperatureIn addition, the mixture was heated to 50° C.
2. stirringstirred for 3 hours
3. customAfter the completion of the reaction
4. customthe insoluble material was removed by filtration
5. concentrationThe filtrate was concentrated under reduced pressure
6. customThe residue was purified by column chromatography on silica gel (eluent: n-hexane/ethyl acetate=10/1)