反应详情

To a solution of 3-[4-benzyloxy-2-(2-tert-butoxycarbonylamino-ethyl)-phenyl]-acrylic acid methyl ester (4.15 g, 10.1 mmol) in THF (100 mL) and MeOH (10 mL) was added 5% Pd—C (200 mg) in THF (10 mL). The resulting suspension was treated with hydrogen under balloon pressure for 18 h. The mixture was filtered through a pad of Celite and concentrated. The residue was purified by silica gel chromatography (EtOAc/hexanes, 6/4) to afford the title compound (1.20 g, 34%). 1H NMR (400 MHz, CDCl3): δ 1.44 (s, 9H), 2.57 (t, 2H, J=7.8 Hz), 2.77 (t, 2H, J=7.3 Hz), 2.88 (t, 2H, J=7.8 Hz), 3.33 (br s, 2H), 3.68 (s, 3H), 6.65 (br s, 1H), 6.67 (d, 1H, J=8.3 Hz), 7.02 (d, 1H, J=8.3 Hz). MS (ES+) m/z 324.1 [M+H]+.

1. filtrationThe mixture was filtered through a pad of Celite
2. concentrationconcentrated
3. customThe residue was purified by silica gel chromatography (EtOAc/hexanes, 6/4)