反应详情

Anhydrous ammonia was bubbled through a magnetically stirred suspension of 2-fluoro-2',3',5'-tri-O-acetyladenosine (2.10 g, 5.1 mmol) in absolute ethanol (500 mL) cooled in an ice-water bath. After 30 min the mixture became homogenous so the addition of ammonia was stopped. The container was tightly stoppered and was stored at 4° C. for days, then the mixture was concentrated under vacuum. The residue was recrystallized twice from ethanol and dried to obtain 1.32 g (90%) of the title compound. 1H NMR (DMSO-d6, 300 MHz) δ 3.5-3.75 (m, 2H), 3.96 (q, 1H), 4.15 (q, 1H), 4.54 (q, 1H), 5.09 (t, 1H), 5.32 (d, 1H), 5.50 (d, 1H), 5.81, (d, 1H), 7.9 (bs, 2H), 8.38 (s, 1H); FT-IR (KBr) 3323, 1688, 1617, 1368 cm-1 ; UV (ethanol) λmax 262 nm.

1. temperaturecooled in an ice-water bath
2. waitwas stored at 4° C. for days
3. concentrationthe mixture was concentrated under vacuum
4. customThe residue was recrystallized twice from ethanol
5. customdried