Water → 2-(2,3,4,6-Tetra-o-acetyl-beta-d-glucopyranosyloxy)-3',4',5'-tribenzyloxyacetophenone

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Reaction Steps

2-Iodo-3′,4′,5′-tribenzyloxyacetophenone (20) (5.64 g, 10 mmol) and β-D-glucose-2,3,4,6-tetraacetate (8) (4.18 g, 12 mmol) was dissolved in dry DCM (50 mL) and sodium hydride (0.48 g, 20 mmol) (0.8 g 60% NaH suspension in oil)) was added in small portions. The reaction mixture was allowed to be stirred at room temperature overnight. Excess of sodium hydride was decomposed by addition of suitable amount water. Dichloromethane was removed under vacuum in order to simplify the work up. Water (100 mL) was added and the water phase extracted with diethyl ether (4×75 mL). The organic layers were combined and washed with water (2×50 mL), dried (MgSO4) and evaporated to give a dark viscous oil. The product was isolated by dry flash chromatography (PE/EtOAc 6:4). Recrystallisation from a mixture of methylcyclohexane and ethyl acetate afforded the desired compound as white crystals, m.p. 156-158° C. Yield 5.1 g (65%).

Provenance & Evidence