反应详情

4-Butoxyphenylacetic acid (288 mg, 1.38 mmol) is converted to the acid chloride and added to D-allo-Thr (150 mg, 1.26 mmol) to get 2c-9, following the procedure described in Example 6. The crude product is purified by chromatography (2.5×18 cm column, gradient 4% CH3OH and 0.3% HOAc in CH2Cl2): NMR δ 0.96 (t, J=7.4, 3 H), 1.14 (d, J=5.8, 3 H), 1.47 (m, 2 H), 1.74 (m, 2 H), 3.53 (br s, 2 H), 3.91 (t, J≈6.5, 2 H), 4.10 (br s, 1 H), 4.53 (br s, 1 H), 4.90 (br s, >2 H), 6.76 (br d, J=6.0, 1 H), 6.84 (d, J=8.4, 2 H), 7.13 (d, J=8.4, 2 H); MS (HR-EI) m/z 309.1567 (M calcd. for C16H23NO5, 309.1576); [α]D26 -26±2 (CHCl3); m.p. 90°-94° C.

1. customto get 2c-9
2. customThe crude product is purified by chromatography (2.5×18 cm column, gradient 4% CH3OH and 0.3% HOAc in CH2Cl2)