反应详情

A solution of ethylene glycol (5.00 ml) in DMF (40 ml) under nitrogen at 0° was treated portionwise with sodium hydride (60% dispersion in mineral oil, 1.292 g) and the mixture was stirred at 0° for 15 min. A solution of (5R)-3-(6-bromohexyl)-5-(2,2-dimethyl-4H-1,3-benzodioxin-6-yl)-1,3-oxazolidin-2-one (7.40 g) in DMF (10 ml) was added. The mixture was stirred at 0° for 0.5 h then at 20° for 3 h. Phosphate buffer solution (pH 6.5, 40 ml) and water (160 ml) were added and the mixture was extracted with EtOAc (2×100 ml). The combined extracts were washed with water (2×150 ml), brine (50 ml) and were dried (Na2SO4). The solvent was evaporated in vacuo and the residue was purified by flash chromatography on silica gel. Elution with MeOH-EtOAc (1:9) gave the title compound (4.10 g). LCMS RT=2.90 min, ES+ve 394 (MH)+.

1. stirringThe mixture was stirred at 0° for 0.5 h
2. waitat 20° for 3 h
3. extractionthe mixture was extracted with EtOAc (2×100 ml)
4. washThe combined extracts were washed with water (2×150 ml), brine (50 ml)
5. dry with materialwere dried (Na2SO4)
6. customThe solvent was evaporated in vacuo
7. customthe residue was purified by flash chromatography on silica gel
8. washElution with MeOH-EtOAc (1:9)