反应详情

To a solution of TFA/THF/H2O (3/3/2) (30 mL) at 0° C. is added 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 (0.3 g, 0.42 mmol). After 30 min the reaction is evaporated under high vacuum, toluene is added (20 mL) and evaporated under high vacuum to remove remaining TFA. The residue is dissolved in CH2Cl2 at 0° C. and neutralized by adding NH4OH dropwise. The solution is concentrated and chromatographed on silica (98% CH2Cl2/2% CH3OH) to give 0.2 g (70.7%) of tetradecanoic acid (3R,6S)-7-oxo-1-pyridin-3-ylmethyl-6-((2R,3R,4S,5R)-(E)-3,4,5-trihydroxy-2-methoxy-8,8-dimethyl-non-6-enoylamino)-azepan-3-yl ester as a with solid. 1H NMR 300 MHz δ 8.62 (s, 2H), 8.17 (d, 1H), 7.67 (d, 1H), 7.33 (m, 1H), 5.83 (d, 1H), 5.42(dd, 1H), 4.69 (m, 1H), 4.54 (m, 1H), 4.33 (d, 1H), 4.32 (t, 1H), 3.83 (dd, 2H), 3.67 (d, 1H), 3.25 (s, 3H), 3.17 (m, 1H), 2.94 (d, 1H), 2.29 (t, 2H), 2.13 (m, 2H), 2.00 (m, 1H), 1.60 (m, 3H), 1.29 (m, 24H), 1.04 (s, 9H), 0.89 (t, 3H); MS (ESI) 690.3 (M+H)+.

1. customAfter 30 min the reaction is evaporated under high vacuum, toluene
2. additionis added (20 mL)
3. customevaporated under high vacuum
4. customto remove
5. dissolutionThe residue is dissolved in CH2Cl2 at 0° C.
6. additionby adding NH4OH dropwise
7. concentrationThe solution is concentrated
8. customchromatographed on silica (98% CH2Cl2/2% CH3OH)