Sodium Hydroxide → HCID 57802353, compound

Participants

Reaction Steps

To a suspension of 4-benzyl-1,5-diisopropyl-1,2-dihydro-3H-pyrazole-3-one (0.078 g), acetobromo-α-D-glucose (0.62 g) and benzyl(n-tributyl)ammonium bromide (0.054 g) in dichloromethane (4 mL) was added a sodium hydroxide aqueous solution (5 mol/L, 0.6 mL) and the mixture was stirred at room temperature for 2 hours. The reaction mixture was purified by column chromatography on aminopropylated silica gel (eluent: tetrahydrofuran). The obtained semi purified 4-benzyl-1,5-diisopropyl-3-(2,3,4,6-tetraacetyl-β-D-glucopyranosyloxy)-1H-pyrazole was dissolved in methanol (3 mL), and sodium methoxide (28% methanol solution, 0.58 mL) was added to the solution. The mixture was stirred at room temperature for 2 hours. The solvent of the reaction mixture was removed under reduced pressure, and the residue was acidified by adding 10% citric acid aqueous solution. The mixture was purified by solid phase extraction on ODS (washing solvent: water, eluent: methanol). Further purification by column chromatography on silica gel (eluent: dichloromethane/methanol=10/1) gave the title compound (0.11 g).

Provenance & Evidence