1,3-Dibromopropane → 1-(4-Bromophenyl)cyclobutanecarbonitrile

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

To a stirred suspension of sodium hydride (60% susp. in oil, 12.24 g, 255 mmol) in anhydrous DMSO (240 mL) is added dropwise 2-(4-bromophenyl)acetonitrile (20.0 g, 102 mmol) dissolved in anhydrous DMSO (40 mL). After 45 min, the reaction mixture is cooled to 0° C. and 1,3-dibromopropane (30.9 g, 15.5 mL, 153 mmol) dissolved in anhydrous DMSO (40 mL) is added slowly to maintain the temperature below 45° C. The reaction mixture is stirred overnight at room temperature and poured in cold water (1.2 L). The product is extracted with CH2Cl2 (6×100 mL), dried on MgSO4, filtered and concentrated under reduced pressure. The product is purified by flash chromatography eluting with hexane:EtOAc (100% to 95:5) to provide the expected product 1-(4-bromophenyl)cyclobutanecarbonitrile (9.9 g, 41%) as a yellowish oil. 1H NMR (300 MHz, CHLOROFORM-D): δ 7.57-7.49 (2H, m), 7.33-7.24 (2H, m), 2.89-2.77 (2H, m), 2.66-2.34 (3H, m), 2.15-1.99 (1H, m).

Herkunft & Nachweise