反应详情

To a mixture of (S)-4-(2-bromo-1-(tert-butyldimethylsilyloxy)ethyl)benzonitrile (7 g, 20.57 mmol) and sodium bicarbonate (2.073 g, 24.68 mmol) in THF (100 mL) was added (R)-ethyl 2-(piperidin-3-yl)acetate (3.52 g, 20.57 mmol). The reaction was heated at reflux for 5 days and then cooled, filtered, and concentrated in vacuo. The crude product was purified on a silica gel cartridge eluting with methanol/dichloromethane gradient (0% for 5 minutes then 0-100% over 20 minutes) to afford 5.5 g of ethyl 2-((R)-1-((S)-2-(tert-butyldimethylsilyloxy)-2-(4-cyanophenyl)ethyl)piperidin-3-yl)acetate. MS (M+1)=431; HPLC RT=1.90 minutes. 1H NMR (400 MHz, CDCl3) δ ppm 7.61 (2H, d), 7.45 (2H, d), 4.76 (1H, m), 4.12 (2H, q), 2.75 (1H, m), 2.69 (1H, m), 2.52 (1H, dd), 2.33 (1H, dd), 2.18 (2H, m), 2.10 (1H, dt), 2.00 (1H, m), 1.88 (1H, tt), 1.72 (1H, m), 1.59 (2H, m), 1.25 (3H, t), 1.0 (1H, m), 0.89 (9H, s), 0.08 (3H, s), −0.07 (3H, s).

1. temperatureThe reaction was heated
2. temperatureat reflux for 5 days
3. temperaturecooled
4. filtrationfiltered
5. concentrationconcentrated in vacuo
6. customThe crude product was purified on a silica gel cartridge
7. washeluting with methanol/dichloromethane gradient (0% for 5 minutes