反应详情

2-(1,3-Dioxolan-2-yl)-3-furaldehyde (2.91 g, 17.31 mmol) is combined with formic acid (17 mL, 451 mmol) and water (4.25 mL) and stirred at rt for 18 h. The mixture is slowly transferred into a solution of NaHCO3 (45 g, 541 mmol) in water (600 mL), then stirred for 0.5 h. EtOAc (200 mL) is added, the layers separated and the aqueous layer extracted with EtOAc (2×200 mL). The combined organics are dried over Na2SO4 and concentrated to a yellow oil (3.28 g). The crude material is chromatographed over 90 g slurry-packed silica gel, eluting with 20% EtOAc/hexane. The appropriate fractions are combined and concentrated to afford 2.45 g of furan-2,3-dicarbaldehyde slightly contaminated with ethylene glycol diformate as a yellow oil. 1H NMR (CDCl3): δ 7.00, 7.67, 10.07, 10.49 ppm.

1. stirringstirred for 0.5 h
2. customthe layers separated
3. extractionthe aqueous layer extracted with EtOAc (2×200 mL)
4. dry with materialThe combined organics are dried over Na2SO4
5. concentrationconcentrated to a yellow oil (3.28 g)
6. customThe crude material is chromatographed over 90 g slurry-packed silica gel
7. washeluting with 20% EtOAc/hexane
8. concentrationconcentrated