反应详情

To a solution of 3-(2,3,4,6-tetra-O-pivaloyl-β-D-glucopyranosyloxy)-4-[2-(4-pivaloyloxyphenyl)ethyl]-1H-pyrazolo-[3,4-b]pyridine (84 mg) in acetone (1.5 mL) were added cesium carbonate (0.11 g) and 2-iodopropane (0.03 mL), and the mixture was stirred at room temperature for 2days. The reaction mixture was purified by column chromatography on silica gel (eluent: n-hexane/ethyl acetate=10/1−2/1) to give 1-isopropyl-3-(2,3,4,6-tetra-O-pivaloyl-β-D-glucopyranosyloxy)-4-[2-(4-pivaloyloxyphenyl)ethyl]-1H-pyrazolo[3,4-b]pyridine (61 mg). This material was dissolved in methanol (2 mL). To the solution was added sodium methoxide (28% methanol solution, 0.04 mL), and the mixture was stirred at 60° C. overnight. The reaction mixture was concentrated under reduced pressure, and the residue was purified by solid phase extraction on ODS (washing solvent: distilled water, eluent: methanol) to give the title compound (26 mg).

1. customThe reaction mixture was purified by column chromatography on silica gel (eluent: n-hexane/ethyl acetate=10/1−2/1)