[F:1][C:2]1[CH:13]=[CH:12][C:5]2[C:6](=[O:11])[O:7][C:8](=[O:10])[NH:9][C:4]=2[CH:3]=1.[H-].[Na+].[CH2:16](I)[CH:17]=[CH2:18]>CN(C=O)C.O>[F:1][C:2]1[CH:13]=[CH:12][C:5]2[C:6](=[O:11])[O:7][C:8](=[O:10])[N:9]([CH2:18][CH:17]=[CH2:16])[C:4]=2[CH:3]=1To a solution of 7-fluoro-2H-3,1-benzoxazine-2,4(1H)-dione (5.01 g, 27.7 mmol) in DMF (100 ml) at 0° C. was added sodium hydride (1.11 g, 27.7 mmol, 60% in paraffin) over 15 min. Allyl iodide (2.6 ml, 27.7 mmol) was added and the solution stirred for 2 h, then poured onto ice (100 g) in water (200 ml). The precipitate was collected, washed with water, then hexane and dried under vacuum at 40° C. to yield the title compound (4.53 g, 74%) as an off-white solid.
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