[CH2:1]([N:8]1[CH2:14][C:13]2[CH:15]=[CH:16][CH:17]=[CH:18][C:12]=2[O:11][CH2:10][C:9]1=O)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[H-].[Al+3].[Li+].[H-].[H-].[H-].[Cl-].[Na+]>O1CCCC1>[CH2:1]([N:8]1[CH2:14][C:13]2[CH:15]=[CH:16][CH:17]=[CH:18][C:12]=2[O:11][CH2:10][CH2:9]1)[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1A solution of 2.5 g of 4-benzyl-4,5-dihydro-benzo[f][1,4]oxazepin-3-one in 50 mL of tetrahydrofuran was added dropwise to a suspension of 1.14 g of lithium aluminum hydride in 50 mL of tetrahydrofuran. The mixture was refluxed for 5 hours and then allowed to cool down to room temperature. 2.2 mL of saturated aqueous sodium chloride solution was added in order to decompose excess lithium aluminum hydride. The precipitated solid was removed by filtration, and the filtrate was concentrated to give 2.2 g of pure 4-benzyl-2,3,4,5-tetrahydrobenzo[f][1,4]oxazepine as an oil. EI-MS: 239 (M+).
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