Acetone → 1-(3,5-Di-O-benzoyi-beta-L-xylofuranosyl)uracil

Beteiligte Stoffe

Reaktionsschritte

Hydrazine hydrate (1.4 mL, 28.7 mmol) was added to a solution of 1-(2-O-acetyl-3,5-di-O-benzoyl-β-L-xylofuranosyl)uracil 1 [Ref.: Gosselin, G.; Bergogne, M.-C.; Imbach, J.-L., “Synthesis and Antiviral Evaluation of β-L-Xylofuranosyl Nucleosides of the Five Naturally Occurring Nucleic Acid Bases”, Journal of Heterocyclic Chemistry, October–November 1993, 30, 1229–1233] (4.79 g, 9.68 mmol) in pyridine (60 mL) and acetic acid (15 mL). The solution was stirred overnight at room temperature. Acetone was added (35 mL) and the mixture was stirred for 30 minutes. The reaction mixture was evaporated under reduced pressure. The resulting residue was purified by silica gel column chromatography [eluent: stepwise gradient of methanol (0–4%) in dichloromethane to give 2 (3.0 g, 68%) which was crystallized from cyclohexane/dichloromethane: mp=111–114° C.; 1H-NMR (DMSO-d6): δ 11.35 (br s, 1H, NH), 7.9–7.4 (m, 11H, 2 C6H5CO, H-6), 6.38 (d, 1H, OH-2′, JOH-2′=4.2 Hz), 5.77 (d, 1H, H-1′, J1′-2′=1.9 Hz), 5.55 (d, 1H, H-5, J5-6=8 Hz), 5.54 (dd, 1H, H-3′, J3′-2′=3.9 Hz and J3′-4′=1.8 Hz), 4.8 (m, 1H, H-4′), 4.7 (m, 2H, H-5′ and H-5″), 4.3 (m, 1H, H-2′); MS: FAB>0 (matrix GT) m/z 453 (M+H)+, 105 (C6H5CO)+; FAB<0 (matrix GT) m/z 451 (M−H)−, 121 (C6H5CO2)−, 111 (B)−; Anal. Calcd for C23H20N2O8.H2O: C, 58.09; H, 4.76; N, 5.96. Found: C, 57.71; H, 4.42; N, 5.70.

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