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温度

0 °C

Under nitrogen atmosphere, to a stirred mixture of (2R*,3R*)-3-hydroxy-4,4-dimethyl-2-(5-phenylpentoxy-carbonylamino)-pentanoic acid and (2R*,3S*)-3-hydroxy-4,4-dimethyl-2-(5-phenylpentoxy-carbonylamino)-pentanoic acid (0.325 g, 0.92 mmol) in dry CH2Cl2, (40 mL). at 0° C., Et3N (0.38 mL, 2.77 mmol) (0.2 mL, 1.44 mmol) and subsequently TBTU (0.356 g, 1.11 mmol) were added. The mixture was left stirring at 0° C. for 1 h and at rt for 15 h. The organics were then removed under reduced pressure, and the resulting crude product purified by column chromatography, using a Teledyne ISCO apparatus, eluting with Cy:AcOEt (from 90:10 to 70:30) to afford the title compound (0.165 g, 54%), as pure anti diastereoisomer, as white solid. MS (ESI) m/z: 351 [M−NH4]+; (ESI) m/z: 332 [M−H]−. 1H NMR (DMSO-d6) δ 0.94 (s, 9H), 1.29-1.39 (m, 2H), 1.52-1.65 (m, 4H), 2.58 (t, J=7.65 Hz, 2H), 4.01 (t, J=6.59 Hz, 2H), 4.33 (d, J=4.66 Hz, 1H), 4.76 (dd, J=4.65, 8.16 Hz, 1H), 7.11-7.36 (m, 5H), 8.05 (d, J=8.15 Hz, 1H).

1. waitThe mixture was left
2. customThe organics were then removed under reduced pressure
3. customthe resulting crude product purified by column chromatography
4. washeluting with Cy