Water → Levovirin

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The substrate (20) (1.1 g) was dissolved in CH3OH/NH3 at 0° C. and placed in a steel bomb. The bomb was closed and stirred at room temperature for 18 h. The steel bomb was cooled, opened and evaporated to dryness. The residue was tried to crystallization with little ethanol. The product crystallized, but on filtration, the crystals re-absorbed water and became a paste. The crystallization repeated several times. Finally it crystallized from Methanol/Ethanol mixture. The colorless crystals was filtered, washed with methanol and dried in vacuo. The filtrate was evaporated again which on standing gave further crystals. Total yield 0.5 g (72%); mp: 177-179° C.; [a]D =+38.33 (c 3 mg/mL H2O); D form of Ribavirin [a]D =-36.0 (c 3.0 mg/mL H2O); 1H NMR (Me2SO-d6) δ 3.46 (m, 1H, C5'H), 3.60 (m, 1H, C5 h), 3.92 (q, 1H, C4H), 4.12 (q, 1H), 4.34 (q, 1H), 4.88 (t, 1H, C5'OH), 5.20 (d, 1H), 5.58 (d, 1H), 5.80 (d, 1H, C1'H), 7.60 (bs, 1H, NH), 7.82 (bs, 1H, NH), and 8.82 (s, 1H, C3H). Anal. Calc. for C8H12N4O5 (244.20): C, 39.34; H, 4.95; N, 22.94. Found: C, 39.23; H, 4.97; N, 22.91.

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