反应详情

2-Bromo-3′,4′,5′-tribenzyloxyacetophenone (11) (2.59 g, 5 mmol) and β-D-glucose-2,3,4,6-tetraacetate (8) (1.74 g, 5 mmol) were dissolved in dry DME (50 mL) and sodium hydride (0.18 g, 7.5 mmol) (0.3 g 60% NaH suspension in oil) was added in small portions. The reaction mixture was allowed to be stirred at room temperature overnight. Water (50 mL) was added and the water phase extracted with DCM (3×25 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) (PE=petroleum ether). Recrystallisation from a mixture of methylcyclohexane and ethyl acetate afforded the desired compound as white crystals, m.p. 156-158° C. Yield 0.51 g (13%). 1H NMR (300 MHz, CDCl3): δ=1.98 (3H, s), 2.00 (3H, s), 2.02 (3H, s), 2.06 (3H, s), 3.63-3.73 (2H, m), 4.08-4.30 (5H, m), 4.62-4.94 (1H, m), 5.02-5.34 (7H, m), 7.20-7.56 (17H, m); 13C NMR (75 MHz): δ=20.5, 20.6, 61.6, 68.2, 70.5, 70.8, 71.2, 71.8, 72.4, 75.0, 100.1, 107.9, 127.4, 127.9, 128.0, 128.1, 128.4, 128.5, 129.6, 136.4, 137.1, 143.2, 152.6, 169.3, 169.5, 170.0, 170.5, 193.4.

1. extractionthe water phase extracted with DCM (3×25 mL)
2. washwashed with water (2×50 mL)
3. dry with materialdried (MgSO4)
4. customevaporated
5. customto give a dark viscous oil
6. customThe product was isolated
7. dry with materialby dry flash chromatography (PE/EtOAc 6:4) (PE=petroleum ether)
8. customRecrystallisation
9. additionfrom a mixture of methylcyclohexane and ethyl acetate