反应详情

温度

70 °C

To a stirred solution of trans-1-tert-butoxycarbonyl-4-dimethylamino-(2S)-hydroxymethyl pyrrolidine (180 mg, 0.73 mmol), methyl 4-hydroxybenzoate (114 mg, 0.75 mmol), and Ph3P (296 mg, 1.13 mmol) in THF (10 ml) was added DIAD (227 mg, 1.13 mmol) at 0° C. The reaction mixture was stirred at 70° C. for 18 hr. The mixture was concentrated in vacuo. The residue was purified by column chromatography on silica gel with n-hexane-EtOAc (1:2, v/v) to MeOH—CH2Cl2(5:95, v/v) as eluent to give methyl 4-[trans-1-tert-butoxycarbonyl-4-dimethylamino-(2S)-pyrrolidinyl]methoxybenzoate (180 mg, 68%) as a pale yellow oil. 1H-NMR (CDCl3) δ 1.46 (s, 9H), 1.80–1.95 (m, 1H), 2.20–2.23 (m, 1H), 2.24 (s, 6H), 2.90–2.95 (m, 1H), 3.10–3.30 (m, 1H), 3.50–3.65 (m, 1H), 3.88 (s, 3H), 3.95–4.35 (m, 3H), 6.93–6.95 (m, 2H), 7.96–7.98 (m, 2H).

1. concentrationThe mixture was concentrated in vacuo
2. customThe residue was purified by column chromatography on silica gel with n-hexane-EtOAc (1:2