反应详情

To a stirred solution of 3-(2,3,4-tri-O-acetyl-α-L-fucopyranosyl)-1-propene (10.65 g, 33.9 mmol) in CH3OH (50 mL) was added NaOCH3 (183 mg, 3.4 mmol). After stirring at rt for 2 hr, the reaction mixture was neutralized with Amberlite IR120 (pre-washed with methanol 3×25 mL). The resin was filtered off and the filtrate was concentrated to give a white solid, which was recrystallized from EtOAc (˜200 mL) to give the title compound. 1H NMR (CDCl3, 400 MHz) δ 1.22 (d, J=6.5, 3H), 2.41 (m, 1H), 2.47 (m, 1H), 3.73 (m, 2H), 3.85 (qd, J=6.5, 2.0, 1H), 3.90 (dd, J=8.9, 5.5, 1H), 3.99 (m, 1H), 5.07 (m, 1H), 5.15 (dq, J=17.2, 1.7, 1H), 5.85 (m, 1H).

1. washthe reaction mixture was neutralized with Amberlite IR120 (pre-washed with methanol 3×25 mL)
2. filtrationThe resin was filtered off
3. concentrationthe filtrate was concentrated
4. customto give a white solid, which
5. customwas recrystallized from EtOAc (˜200 mL)