反应详情

To a stirred solution of tetradecanoic acid (0.39 g 1.7 mmol) and 4-dimethylaminopyridine (0.21 g, 1.7 mmol) in CH2Cl2(15 mL) is added 1-ethyl-3-[3-(dimethylamino)propyl]-carbodiimidehydrochloride (0.34 g, 1.7 mmol) at room temperature. After 30 min (R)-2-[(4R,5R,6R)-6-((E)3,3-dimethyl-but-1-enyl)-5-hydroxy-2,2-dimethyl-[1,3]dioxan-4-yl]-N-((3S,6R)-6-hydroxy-2-oxo-1-pyridin-3-ylmethyl-azepan-3-yl)-2-methoxy-acetamide (0.74 g, 1.4 mmol) is added and stirred for 16 h. The reaction is concentrated and chromatographed on silica (98% CH2Cl2/2% CH3OH) to give 0.3 g (28.8%) of tetradecanoic acid (3R,6S)-6-{(R)-2-[(4R,5R,6R)-6-((E)-3,3-dimethyl-but-1-enyl)-5-hydroxy-2,2-dimethyl-[1,3]dioxan-4-yl]-2-methoxy-acetylamino}-7-oxo-1-pyridin-3-ylmethyl-azepan-3-yl ester as a white solid. 1H NMR 300 MHz δ 8.54(s, 2H), 7.88 (d, 1H), 7.63 (d, 1H), 7.29 (m, 1H), 5.77 (d, 1H), 5.54(dd, 1H), 5.06 (d, 1H), 4.75 (m, 1H), 4.50 (m, 1H), 4.29 (m, 2H), 4.08 (d, 1H), 3.90 (d, 1H), 3.52 (s, 3H), 3.50 (m, 1H), 3.25 (d, 1H), 2.27 (t, 2H), 2.15 (m, 2H), 2.00 (m, 1H), 1.60 (m, 3H), 1.46 (d, 2H), 1.25 (m, 24H), 1.04 (s, 9H), 0.88 (t, 3H); MS (ESI) 730.3 (M+H)+.

1. concentrationThe reaction is concentrated
2. customchromatographed on silica (98% CH2Cl2/2% CH3OH)