反应详情

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).

1. temperaturecooling
2. stirringthe mixture is stirred
3. customThe organic layer is collected
4. washwashed with water
5. customdried
6. customevaporated
7. customto remove the solvent
8. dissolutionThe residue is dissolved in a mixture of methanol (10 ml) and tetrahydrofuran (10 ml)
9. additionis added triethylamine (202 mg)
10. stirringThe mixture is stirred at 50° C. for 40 minutes
11. customevaporated
12. customto remove the solvent
13. dissolutionThe residue is dissolved in ethyl acetate
14. washthe mixture is washed with water
15. customdried
16. customevaporated
17. customto remove the solvent
18. customThe residue is purified by silica gel column chromatography (solvent; chloroform/methanol)