Furfural → ([4-Bromo-2,6-dimethylphenyl]furan-2-yl)methanol

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

4-Bromo-2,6-dimethyl-1-iodobenzene (5 g, 16 mmol) is dissolved in dry tetrahydrofuran (20 ml) and cooled to −78° C. under an atmosphere of dry nitrogen. Isopropylmagnesium chloride (2M solution in tetrahydrofuran, 10 ml, 20 mmol) is added dropwise with vigorous stirring over 30 minutes. When the addition is complete, the reaction is allowed to warm to room temperature and is stirred for 30 minutes at room temperature. The reaction mixture is cooled to −78° C. and a solution of 2-furaldehyde (2.4 g, 25 mmol) in dry tetrahydrofuran (10 ml) is added dropwise over 30 minutes. Once the addition is complete, the mixture is allowed to warm to room temperature and stirring continued for 2 hours. A solution of saturated aqueous ammonium chloride (30 ml). is added, and the mixture is extracted with dichloromethane (3×25 ml). The organic extracts are combined, washed with brine, dried over anhydrous magnesium sulfate, filtered and the filtrate is evaporated under reduced pressure. The residue is purified by column chromatography on silica gel to give ([4-bromo-2,6-dimethylphenyl]furan-2-yl)methanol (3.71 g).

Herkunft & Nachweise