Sodium Iodide → 1-(3-benzyloxy-propyl)-3-(2,3,4,6-tetra-O-pivaloyl-beta-D-glucopyranosyloxy)-4-[2-(4-pivaloyloxyphenyl)ethyl]-1H-pyrazolo[3,4-b]pyridine

Participants

Reaction Steps

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 (1 g) in acetone (10 mL) were added cesium carbonate (0.78 g), benzyl 3-bromopropyl ether (0.32 mL) and a catalytic amount of sodium iodide, and the mixture was stirred at room temperature for 2 days. The reaction mixture was purified by column chromatography on silica gel (eluent: n-hexane/ethyl acetate=4/1−2/1) to give 1-(3-benzyloxy-propyl)-3-(2,3,4,6-tetra-O-pivaloyl-β-D-glucopyranosyloxy)-4-[2-(4-pivaloyloxyphenyl)ethyl]-1H-pyrazolo[3,4-b]pyridine (0.77 g). This material was dissolved in methanol (10 mL). To the solution was added 10% palladium-carbon powder (0.25 g), and the mixture was stirred at room temperature under a hydrogen atmosphere for 2 hours. The insoluble material was removed by filtration, and the filtrate was concentrated under reduced pressure. The residue was purified by column chromatography on silica gel (eluent: n-hexane/ethyl acetate =1/1−1/2) to give the title compound (0.54 g).

Provenance & Evidence