alpha-D-Glucopyranosyl bromide, tetraacetate → 4-((4-ethylthiophenyl)methyl]-5-methyl-3-(2,3,4,6-tetra-O-acetyl-beta-D-glucopyranosyloxy)-1H-pyrazole

Beteiligte Stoffe

Reaktionsschritte

To a suspension of 4-[(4-ethylthiophenyl)methyl]-1,2-dihydro-5-methyl-3H-pyrazol-3-one (1.6 g) and acetobromo-α-D-glucose (2.9 g) in tetrahydrofuran (30 mL) was added silver carbonate (2.1 g), and the mixture was stirred under shading the light at 60° C. overnight. The reaction mixture was purified by column chromatography on aminopropyl silica gel (eluent: tetrahydrofuran) and further column chromatography on silica gel (eluent: hexane/ethyl acetate=1/3) to give 4-[(4-ethylthiophenyl)methyl]-5-methyl-3-(2,3,4,6-tetra-O-acetyl-β-D-glucopyranosyloxy)-1H-pyrazole (1.4 g).

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