反应详情

Triphenylphosphine (5.25 g, 20.0 mmol) and diethyl azodicarboxylate (3.58 g, 20.0 mmol) were added to a solution of (1R)-3-chloro-1-phenyl-1-propanol (3.42 g, 20.0 mmol) and phthalimide (2.94 g, 20.0 mmol) in THF (100 mL). The reaction mixture was stirred for 4 h at room temperature. The solvent was removed under reduced pressure and the residue was triturated with pentane (3×50 mL). The combined pentane fractions were concentrated in vacuo and the crude product was purified by chromatography on silica using EtOAc/hexane (3:97) to give the desired product (4.40 g, 74%). 1H NMR (400 MHz, CDCl3) δ 7.82 (d, 1H, J=5.7 Hz), 7.81 (d, 1H, J=5.5 Hz), 7.70 (d, 1H, J=5.4 Hz), 7.69 (d, 1H, J=5.8 Hz), 7.55 (d, 2H, J=7.2 Hz), 7.38–7.28 (m, 3H), 5.64 (dd, 1H, J=6.8, 9.2 Hz), 3.56 (t, 2H, J=6.4 Hz), 3.11–3.02 (m, 1H), 2.85–2.75 (m, 1H); ESMS m/e: 300.1 (M+H)+.

1. customThe solvent was removed under reduced pressure
2. customthe residue was triturated with pentane (3×50 mL)
3. concentrationThe combined pentane fractions were concentrated in vacuo
4. customthe crude product was purified by chromatography on silica