Dimethylformamide → 2-(1,3-Dioxolan-2-yl)-3-furaldehyde

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

2-(3-Bromo-2-furyl)-1,3-dioxolane (438 mg, 2.0 mmol) is dissolved in Et2O (5 mL) in an oven-dried flask, under nitrogen, cooled to −78° C., treated dropwise with tert-butyllithium (2.59 mL, 4.4 mmol) and stirred for 1 h. DMF (178 μL, 2.3 mmol) in Et2O (2 mL) is added dropwise, the mixture stirred for 4 h at −78° C., then treated with oxalic acid dihydrate (504 mg, 4.0 mmol) followed by water (2 mL). The cooling bath is removed and the mixture allowed to warm to rt over 1 h. The mixture is diluted with water (20 mL) and EtOAc (20 mL), the layers are separated and the aqueous layer extracted with EtOAc (1×20 mL). The organics are dried over Na2SO4 and concentrated to a yellow oil. The crude material is chromatographed over 12 g slurry-packed silica gel, eluting with 15% EtOAc/hexane. The appropriate fractions are combined and concentrated in vacuo to afford 228 mg (68%) of 2-(1,3-dioxolan-2-yl)-3-furaldehyde as a pale yellow oil. MS (EI) m/z: 168 (M+).

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