Cesium carbonate → 1-(2-benzyloxyethyl)-4-[(4-ethylphenyl)methyl]-3-(beta-D-glucopyranosyloxy)-5-methyl-1H-pyrazole

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To a suspension of 4-[(4-ethylphenyl)methyl]-5-methyl-3-(2,3,4,6-tetra-O-acetyl-β-D-glucopyranosyloxy)-1H-pyrazole (0.030 g) and cesium carbonate (0.091 g) in acetonitrile (0.4 mL) was added benzyl(2-bromoethyl)ether (0.035 mL), and the mixture was stirred at 80° C. for 30 minutes. After cooling to room temperature, the reaction mixture was further stirred overnight. To the reaction mixture were added methanol (0.4 mL) and 2 mol/L aqueous sodium hydroxide solution (0.55 mL), and the mixture was stirred at room temperature for 1 hour. Water was added to the reaction mixture, and the mixture was purified by CBA solid phase extraction (washing solvent: distilled water, eluent: methanol), and successively by column chromatography on silica gel (eluent: dichloromethane/methanol=10/1-5/1) to give to give 1-(2-benzyloxyethyl)-4-[(4-ethylphenyl)methyl]-3-(β-D-glucopyranosyloxy)-5-methyl-1H-pyrazole (0.012 g).

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