[Cl:1][C:2]1[CH:3]=[CH:4][C:5]2[O:10][CH2:9][C:8](=O)[NH:7][C:6]=2[CH:12]=1.B.C1COCC1>C1COCC1>[Cl:1][C:2]1[CH:3]=[CH:4][C:5]2[O:10][CH2:9][CH2:8][NH:7][C:6]=2[CH:12]=1Using 6-chloro-4H-benzo[1,4]oxazin-3-one (0.6 g, 3.3 mmol) and borane-THF (16.4 mL of a 1M solution in THF, 16.4 mmol) in THF (15 mL) to yield the title compound as a clear oil (0.16 g, 55%). δH (CDCl3) 3.35-3.47 (2H, m), 3.81 (1H, br s), 4.17-4.29 (2H, m), 6.54-6.62 (2H, m), 6.64-6.72 (1H, m).
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