O.[CH2:2]1[CH2:6][O:5][CH:4]([N:7]2[C:13](=[O:14])[NH:12][C:10](=[O:11])[C:9]([F:15])=[CH:8]2)[CH2:3]1.B(F)(F)F.CCOCC>O1CCOCC1>[F:15][C:9]1[C:10](=[O:11])[NH:12][C:13](=[O:14])[NH:7][CH:8]=1.[CH2:2]1[CH2:6][O:5][CH:4]([N:7]2[C:13](=[O:14])[NH:12][C:10](=[O:11])[C:9]([F:15])=[CH:8]2)[CH2:3]11.600 g crude addition product of water to 2,3-dihydrofuran (prepared as described in Example 1) was added under stirring to a mixture of borontrifluoride-etherate (0.710 g; 5.0 m.mole) and anhydrous dioxane (20 ml) followed by the addition of silylated-5-fluorouracil (2,740 g; 10.0 m.mole). The reaction mixture was stirred for 3 hours at room temperature after which it was worked up as described in Example 1. 0.200 g unreacted 5-fluorouracil and 1.580 g (93%) Ftorafur were isolated.
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