Ethoxyacetic acid → 2'-(6-O-ethoxyacetyl-beta-D-glucopyranosyloxy)-6'-hydroxy-3-(5-benzo[b]furanyl)propiophenone

Beteiligte Stoffe

Reaktionsschritte

To a solution of 2'-(β-D-glucopyranosyloxy)-6'-hydroxy-3-(5-benzo[b]furanyl)propiophenone (889 mg) and ethoxyacetic acid (250 mg) in pyridine (25 ml) is added N,N-bis(2-oxo-3-oxazolidinyl)phosphinic chloride (1527 mg) under ice-cooling, and the mixture is stirred at room temperature for 19 hours. To the reaction solution are added a saturated aqueous sodium hydrogen carbonate solution and chloroform, and the mixture is stirred. The organic layer is collected, washed with water, dried, and evaporated to remove the solvent. The residue is dissolved in a mixture of methanol (10 ml) and tetrahydrofuran (10 ml), and thereto is added triethylamine (202 mg). The mixture is stirred at 50° C. for 40 minutes, and evaporated to remove the solvent. The residue is dissolved in ethyl acetate, and the mixture is washed with water, dried, and evaporated to remove the solvent. The residue is purified by silica gel column chromatography (solvent; chloroform/methanol) to give 2'-(6-O-ethoxyacetyl-β-D-glucopyranosyloxy)-6'-hydroxy-3-(5-benzo[b]furanyl)propiophenone (377 mg).

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