反应详情

温度

0 °C

Under nitrogen atmosphere at 0° C., to a stirred mixture of (2R,3R)-3-hydroxy-2-(5-phenylpentoxy-carbonylamino)-butanoic acid (0.23 g, 0.74 mmol) in dry CH2Cl2 (23 mL), Et3N (0.31 mL, 2.22 mmol) and subsequently TBTU (0.28 g, 0.88 mmol) were added. The mixture was left stirring 1 h at 0° C. and 15 h at rt. Upon full conversion of the starting material, the organics were removed under reduced pressure, and the resulting crude product absorbed over silica gel and purified by typical column chromatography, eluting with Cy:EtOAc (from 100:0 to 0:100) to afford the title compound (0.15 g, 69%), as white solid. [α]25D +28.23 (c 0.1, CHCl3). MS (ESI) m/z: 292 [M−H]+; (ESI) m/z: 290 [M−H]−. 1H NMR (DMSO-d6) δ 1.38-1.27 (m, 2H), 1.47 (d, J=6.1 Hz, 3H), 1.64-1.53 (m, 4H), 2.59-2.54 (m, 2H), 3.98 (t, J=6.6 Hz, 2H), 4.77-4.64 (m, 2H), 7.21-7.13 (m, 3H), 7.31-7.24 (m, 2H), 8.04 (d, J=7.9 Hz, 1H).

1. additionwere added
2. waitThe mixture was left
3. customUpon full conversion of the starting material, the organics were removed under reduced pressure
4. customthe resulting crude product absorbed over silica gel
5. custompurified by typical column chromatography
6. washeluting with Cy