反应详情

A suspension of Raney nickel (40 g, washed with 3×100 mL ethanol) in ethanol (80 mL) was stirred under hydrogen atmosphere for 1.5 hours. The suspension was treated with a solution of the intermediate obtained in Step B (4.1 g, 8.5 mmol) in ethanol (180 mL) at room temperature and stirred vigorously for 5 hours. The suspension was carefully filtered through celite and concentrated. Filtration through silica gel (CH2Cl2) afforded the title compound (99% e.e.) as a white solid (2.74 g, 8 mmol, 94%). 1H NMR (300 MHz, CDCl3): δ 7.11 (m, 3H), 7.04 (m, 1H), 4.64 (dq, J=3.7, 6.6 Hz, 1H), 3.73 (sept, J=6.6 Hz, 1H), 3.18 (sept,. J=6.6 Hz, 1H), 2.15 (m, 2H), 1.56 (d, J=3.7 Hz, 1H), 1.39 (d, J=6.6 Hz, 3H), 1.28 (m, 14H), 0.73.(t, J=7.35 Hz, 3H). FAB-MS calculated for (C22H31FNO, M+H) 344, found 344. Anal. Calcd for C22H30FNO: C, 76.93; H, 8.80; N, 4.08; F, 5.53; Found: C, 77.20; H, 8.97; N, 4.01; F, 5.60. [a]D=+39.4° (CH2Cl2). mp 104-106° C. Rf=0.4 (CH2Cl2).

1. stirringstirred vigorously for 5 hours
2. filtrationThe suspension was carefully filtered through celite and
3. concentrationconcentrated
4. filtrationFiltration through silica gel (CH2Cl2)