反应详情

温度

60 °C

A solution of the crude amine from Step 3 and 6.51 g (20 mmole) of Cs2CO3 in 30 mL dry acetonitrile was stirred at rt in a flask fitted with a small Dean-Stark trap. After 15 minutes, 4.6 g (15 mmole) of 3-[bromo(4-chlorophenyl)methyl]benzonitrile was added and the mixture was heated at 60° C. After 18 h, the solution was filtered through CELITE and the residue was washed with acetonitrile. The combined filtrates were concentrated and the residue was purified by flash chromatography using a step gradient of 5 to 20% ethyl acetate-hexane. Fractions containing the faster product diastereomer were pooled and concentrated to afford the title compound; 1NMR (CDCl3) δ 1.25 (t, J=22 Hz, 611), 2.33 (t, J=6.5 Hz, 1H), 2.83-2.89 (m, 2H), 3.09-3.11 (m, 2), 3.60 (m, 1), 4.24 (s, 1H), 6.68-6.71 (m, 3H), 7.21-7.8 (m, 8H); Mass Spectrum: m/e=469 (M+1, 35Cl) and 471 (M+1, 37Cl).

1. customfitted with a small Dean-Stark trap
2. waitAfter 18 h
3. filtrationthe solution was filtered through CELITE
4. washthe residue was washed with acetonitrile
5. concentrationThe combined filtrates were concentrated
6. customthe residue was purified by flash chromatography
7. additionFractions containing the faster product diastereomer
8. concentrationconcentrated