反应详情

To a stirred mixture of (2S,4S)-1-tert-butoxycarbonyl-4-(2-naphthyloxy)-2-pyrrolidinylmethanol (640 mg, 1.86 mmol), methyl 4-hydroxybenzoate (283 mg, 1.86 mmol) and PPh3 (488 mg, 1.86 mmol) in THF (18 ml) was added DIAD (0.37 ml, 1.86 mmol) at room temperature under an atmosphere of nitrogen. The mixture was stirred over night. After removal of the solvent, the resulting residue was chromatographed on silica gel [100 g, n-hexane/EtOAc(2/1)], to give methyl 4-[(2S,4S)-1-tert-butoxycarbonyl-4-(2-naphthyloxy)-2-pyrrolidinyl]methoxybenzoate (830 mg, 93%) as a colorless oil. 1H-NMR (CDCl3) δ1.50 (d, J=8.3 Hz, 9H), 2.34 (m, 1H), 2.53 (d, J=14.2 Hz, 1H), 3.72-3.85 (m, 1H), 3.86 and 3.87 (s, 3H, amide isomers), 4.17 (m, 1H), 4.26-4.52 (m, 2H), 5.06 (br, 1H), 6.87 (d, J=8.8 Hz, 1H), 6.94 (d, J=8.8 Hz, 2H), 7.04 (br, 2H), 7.33 (t, J=7.3 Hz, 1H), 7.42 (t, J=7.3 Hz, 1H), 7.64-8.02 (m, 5H).

1. customAfter removal of the solvent
2. customthe resulting residue was chromatographed on silica gel [100 g, n-hexane/EtOAc(2/1)]