反应详情

To a stirred solution of 1-(4-bromophenyl)cyclobutanecarbonitrile (2.8 g, 11.9 mmol) in anhydrous THF (70 mL) at −78° C. is added n-butyllithium (2 M in c-hexane) (7.44 mL, 14.9 mmol). The reaction mixture is stirred at that temperature 10 min., then N-methoxy-N-methyl-acetamide (2.50 mL, 23.8 mmol) is added and the solution is then left to warm-up to room temperature over 1 h. A mixture of brine (30 mL) and 1 N HCl (15 mL) is then slowly added and the solution is extracted with EtOAc (3×100 mL). The organic layer is dried over MgSO4, filtered and concentrated under reduced pressure. The crude product is purified by flash chromatography using a 0 to 20% EtOAc in hexane gradient to yield 1-(4-acetylphenyl)cyclobutanecarbonitrile (1.35 g, 57%) as a yellowish oil. 1H NMR (300 MHz, CHLOROFORM-D) δ 8.03-(2H, m), 7.56-7.50 (2H, m), 2.94-2.81 (2H, m), 2.71-2.57 (2H, m), 2.62 (3H, s), 2.57-2.40 (1H, m), 2.18-2.05 (1H, m).

1. waitthe solution is then left
2. additionis then slowly added
3. extractionthe solution is extracted with EtOAc (3×100 mL)
4. dry with materialThe organic layer is dried over MgSO4
5. filtrationfiltered
6. concentrationconcentrated under reduced pressure
7. customThe crude product is purified by flash chromatography